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ANSYS Conference Papers (47 entries)
 
180 Series Elements: Why Should One Use Them in Linear Analysis
  (ANSYS, Inc.)
  Presentation on 18x elements (continuum, beam, shell) and its features related to both linear and nonlinear analyses.
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Average Rating: 9.2 (81 votes)  
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A Non-Linear Domain Decomposition Method
  Iakov Mordukhovich Klebanov, Andrei Nikolaevich Davydov
  "A new domain decomposition technique for parallelization of physically non-linear problems in solid mechanics is developed. It is extended for any stress-strain diagrams. The approach is based on the approximating generalized models of subdomains that leads to a considerably fewer number of iterations requiring updating of substructure parameters. The analytical proof of the convergence of the theoretical iterative procedure and the demonstration of convergence of its numerical implementation with the help of ANSYS are presented."
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Average Rating: 9.4 (54 votes)  
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Abstracts from papers presented at the 1998 ANSYS Conference
  (ANSYS, Inc.)
  Abstracts only.
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Average Rating: 9.0 (25 votes)  
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Analysis Of Gasketed Flanges With Ordinary Elements Using APDL Control
  Yasumasa Shoji, Satoshi Nagata
  "The analysis of gasketted flanges is now becoming an essential technique to design pressure vessels or piping, because the design code is being modified. On the other hand, the gasket has an extreme nonlinearity which causes the analysis to be very difficult, especially using linear material properties. A finite element analysis program other than ANSYS has the element library for gasket element, but ANSYS does not have it yet."

"The authors developed a method to model this nonlinear gasket by using the elements available in ANSYS Rel. 5.5 for 2-dimensional axisymmetric analysis and those in Rel. 5.6 for 3-dimensional analysis. In this paper, the concept and the procedure of the modeling is introduced. The data input is possible using a template, without using any other ANSYS commands. The whole analysis execution is controlled by APDL."

[STI: Gasket elements are available from version 6.1 onwards, after this paper was written]
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Average Rating: 7.9 (29 votes)  
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Anisotropic Plasticity and Failure Prediction in Wood Composites
  David M. Moses, Helmut G.L. Prion
  "Two case studies are summarized using anisotropic plasticity and the Weibull weakest link failure model to predict the behavior of wood and wood composites. The linear elastic orthotropic model normally used for wood is shown to be insufficient for the prediction of ultimate strength in wood. Non-linear, non-recoverable behavior in compression in each of the orthogonal material directions is of particular interest in cases where localized crushing governs the load-displacement behavior of wood."

"The anisotropic plasticity option in ANSYS was used to predict yielding and post-yield behavior for the wood composite used in this study because yield stresses in orthogonal directions were found to be in the ratio of 1:1.2:5. A user-programmable Fortran subroutine was developed for ANSYS to carry out the failure analysis (and to calculate the volume integration of the stresses) at each load-step in post-processing. The model was verified using two cases: I) the ASTM D143 shear block test, and II) bolted connections."
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Average Rating: 9.2 (32 votes)  
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ANSYS Cast Iron Material Model Matches Experimental Data
  (ANSYS, Inc.)
  "[The purpose of this paper is to] verify the accuracy of the ANSYS cast iron material model. Results from ANSYS are compared with experimental data for a biaxially loaded cruciform geometry."
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Average Rating: 9.5 (11 votes)  
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ANSYS Equation Solvers: Usage and Guidelines
  Gene Poole (ANSYS, Inc.)
  Discussion of ANSYS solvers, focusing on the sparse direct solver and PCG iterative solver.
Originally presented at the 2002 Conference.
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Average Rating: 10.0 (7 votes)  
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ANSYS Mechanical - A Powerful Nonlinear Simulation Tool
  Grama Bhashyam (ANSYS, Inc.)
  A whitepaper describing various ANSYS features in the area of nonlinear mechanics, including element formulation, constitutive models, and contact technology.
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Average Rating: 9.6 (14 votes)  
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Benchmark Tests on ANSYS Parallel Processing Technology
  Kentaro Suzuki
  "ANSYS Inc. has released parallel processing solvers, DDS (Distributed Domain Solver) and AMG (Algebraic Multigrid Solver) in ANSYS version 5.7 in order to meet the requirements from the market."

"In this paper, simple tests are first carried out to confirm the features and capabilities of DDS and AMG for different types of analyses. Furthermore, real-life problems such as thermal stress of an engine block (7.3 million DOF) and elastic-plastic-creep behavior of an IC packaging (about 84,000 DOF) are analyzed. The effectiveness of ANSYS parallel processing solvers is also studied."
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Average Rating: 5.0 (6 votes)  
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Cast Iron Plasticity
  (ANSYS, Inc.)
  Presentation on Cast Iron plasticity model introduced in ANSYS 6.1 (part of the "Advanced Analysis with ANSYS" seminar during the 2002 User's Conference).
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Average Rating: 9.4 (8 votes)  
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Closing the Gaps on Data Interoperability [PDF]
  Don Hemmelgarn
  PowerPoint presentation
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Average Rating: 10.0 (4 votes)  
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Collaborative Virtual Prototyping: A Product Development Imperative [PDF]
  Marc Halpern
  PowerPoint presentation
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Average Rating: 8.8 (4 votes)  
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Cyclic Symmetry Analysis
  (ANSYS, Inc.)
  Presentation on cyclic symmetry enhancements at ANSYS 6.1 (part of the "Advanced Analysis with ANSYS" seminar during the 2002 User's Conference).
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Average Rating: 9.6 (13 votes)  
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Dynamic Shock Simulation Of A Computer Hard Drive Using an ANSYS/LS-DYNA Implicit-Explicit Sequential Solution
  Chris Andersen, John Stricklin
  "This paper describes a nonlinear transient dynamic analysis of a computer hard drive using ANSYS in combination with ANSYS/LS-DYNA. The model includes the enclosure, platters, spindle, read/write heads, and other key components. The objective of the analysis was to determine the interaction between the parts in this assembly, such as lift off and impact between the read/write heads and platters, when the hard drive is subjected to a 250 G half sinusoid shock load. This load simulates a shock test, which the manufacturer does to qualify hard drives." From 2000 Conference
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Average Rating: 9.2 (40 votes)  
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Effects of Nonlinear Geometric and Material Properties on the Seismic Response of Fluid/Tank Systems
  He Liu, Daniel H. Schubert
  "To explore the effects large deformation and nonlinear material properties have on the seismic response of fluid/tank systems, the computer program ANSYS was selected to develop a Finite Element Analysis (FEA) model of a ground level, cylindrical steel shell and roof tank structure with contained fluid under seismic load. The ANSYS program was selected for its ability to include shell and structural steel elements, contained fluid elements, fluid-structure interactions, material and geometric nonlinearities, and contact type elements. For purposes of this study, analysis results from a linear elastic, small deformation fixed base model are compared with an elasto-plastic material property model with large deformation assumptions. Results show the significant difference in results based on the assumptions used and indicate that current design code based values may not be conservative in resultant loading calculations."
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Average Rating: 10.0 (34 votes)  
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Finite Element Analysis at Mannesmann VDO Fuel Systems [PDF]
  Zlatko Penzar
  PowerPoint presentation
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Average Rating: 8.3 (12 votes)  
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Finite Element Analysis of an AC Solenoid Including the Effects of Harmonic Loading and Magnetic Saturation
  A. Bax, C. Andersen, M. Yaksh, D. Ostergaard
  From 1994 Conference
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Average Rating: 9.7 (15 votes)  
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Finite Element Analysis Of Crowning Sealing Caps
  Henri Champliaud, L Van Ngan
  "Metal closures, with an integrated gasket, are widely used in the food industry to ensure the sealing of the glass bottles by setting. The success of this bottle-capping is due to the relevant choice of the variables in the manufacturing process. Actually, the effects of the various variables of the process are not precisely understood."

"In this paper, the leakage pressure of an assembly, with given parameters of a standard setting operation is predicted. The study is concentrated firstly on the simulation of setting the cap on the bottle, and secondly, on the global distribution of the efforts of contact on the gasket according to the internal pressure. Finally, the leakage pressure of the assembly is determined using practical tests that relate the leakage pressure with the global force exerted on the gasket."
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Average Rating: 7.1 (7 votes)  
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Finite Element Based Solder Joint Fatigue Life Predictions for a Same Die Stacked Chip Scale Ball Grid Array Package
  Bret Zahn
  "Viscoplastic finite-element simulation methodologies were utilized to predict solder joint reliability for a same die size, stacked, chip scale, ball grid array package under accelerated temperature cycling conditions (-40C to +125C, 15min ramps/15min dwells). The effects of multiple die attach material configurations were investigated along with the thickness of the mold cap and spacer die. The solder structures accommodate the bulk of the plastic strain that is generated during accelerated temperature cycling due to the thermal expansion mismatch between the various materials that encompass the stacked die package. Since plastic strain is a dominant parameter that influences low-cycle fatigue, it was used as a basis for evaluation of solder joint structural integrity. The paper discusses the analysis methodologies as implemented in the ANSYS finite element simulation software tool and the corresponding results for the solder joint fatigue life. Some ANSYS parametric design language commands are included for the benefit of those readers who are familiar with the tool."
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Average Rating: 9.7 (15 votes)  
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Gasket Materials
  (ANSYS, Inc.)
  Presentation on the gasket materials and companion interface elements, introduced at ANSYS 6.1 (part of the "Advanced Analysis with ANSYS" seminar during the 2002 User's Conference).
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Average Rating: 10.0 (2 votes)  
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Hyper-Elastic Contact Analysis of a Push-Button Diaphragm Seal
  Jeffrey R. Annis
  "Presented is the non-linear finite element analysis of a rubber diaphragm seal utilizied in a pushbutton design. Analysis considerations encompassed, nonlinear hyper-elastic material behavior of the rubber, large deflection analysis of seal complex motion, and contact analysis with mating parts. Design parameters of primary interest were, seal deflection patterns and seal actuation force as a function of travel."
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Average Rating: 10.0 (14 votes)  
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Hyperelasticity
  (ANSYS, Inc.)
  Presentation on the various hyperelastic strain energy functions available in ANSYS (part of the "Advanced Analysis with ANSYS" seminar during the 2002 User's Conference).
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Average Rating: 9.0 (5 votes)  
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Implicit Creep
  (ANSYS, Inc.)
  Presentation on implicit creep (part of the "Advanced Analysis with ANSYS" seminar during the 2002 User's Conference).
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Average Rating: 10.0 (11 votes)  
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Maximization Of The Design Of A Scleral Expansion Band Segment For The Reversal Of Presbyopia
  Andrew J. Bax, Ronald A. Schachar
  "The focusing ability of the human eye declines universally with age. This age related decline in the amplitude of accommodation results in difficulty in reading at a normal working distance in the 40's and is called presbyopia. Conventionally, bifocals, reading glasses or bifocal contact lenses are used to facilitate reading in presbyopic patients. A new method for correcting presbyopia involves placing an implant, a scleral expansion segment, in the sclera (white of the eye) to alter the position of the underlying ciliary muscle." (Contact, Hyperelasticity, Mooney-Rivlin) From 2000 Conference
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Average Rating: 10.0 (2 votes)  
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Mesh Discretization Error and Criteria for Accuracy of Finite Element Solutions
  Chandresh Shah
  "Any finite element analysis performed by an engineer is subject to several types of errors that can compromise the validity of the results. These errors can be broadly classified under the following categories: 1) user error - incorrect usage of FE software or input by the FE analyst, 2) errors due to assumptions and simplifications used in the model and 3) errors due to insufficient mesh discretization. User errors can be prevented by developing and utilizing a comprehensive pre and post processing checklist and by appropriate training in the basics of finite element analysis and usage of FE software. Errors due to modeling assumptions and simplifications can be alleviated by adding complexity to the model so that it better represents the physics of the problem being analyzed. Errors due to the inadequacy or coarseness of the mesh are often overlooked by the analyst. These errors due to mesh discretization can be fixed by evaluating the quality of the mesh and by developing and utilizing criteria that characterize the accuracy of the FE solution. This paper describes the source of mesh discretization error and presents several criteria that can be used by an FE analyst to evaluate the accuracy of the FE solution."
[ANSYS 5.7, 2002 Conference]
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Average Rating: 10.0 (4 votes)  
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Meshing papers presented at the 1998 Conference
  Various ANSYS staff and CMU students
  10 Papers on meshing algorithms
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Average Rating: 8.7 (16 votes)  
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Methods for Modeling Bolts in the Bolted Joint
  Jerome Montgomery
  "Modeling bolts for three-dimensional finite element applications have, and still continue to raise questions. The limitations on model size sometimes make modeling of solid bolts impractical. Therefore, many analysts choose other methods to model bolts. Line elements with coupled nodes and line elements with spider beams are a couple of alternative approaches. This paper looks at a few methods for modeling pretension bolted joints using the finite element method (ANSYS 5.7). Pretension is modeled using ANSYS pretension elements (PRETS179) which can be used on solid or line element types. Surface-to-surface contact elements are used to account for varying contact distribution along flanges. Bolt head and nut behavior is modeled by, coupled nodes, beam elements, rigid body elements (RBE3), or solids. Bolt stud is modeled by solid elements, beam elements, pipe elements, or link elements. The choice of line elements versus solid elements is determined by the degree of complexity sought. The pros and cons of different simulations are also discussed."
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Average Rating: 9.3 (54 votes)  
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Modeling Diesel Engine Cylinder Head Gaskets using the Gasket Material Option of the SOLID185 Element
  Jonathan Raub
  "The modeling of diesel engine cylinder head gasket joints is complicated by the nonlinear response of the head gasketís materials. Linearization of these material responses can lead to significant errors in the solutionís results. The 1-dimensional nonlinear approximation made by the Gasket material option of the SOLID185 element sufficiently captures the response of the nonlinear gasket materials while maintaining practical solution times for the large model sizes associated with multi-cylinder head gasket joint models. This paper will give an overview of the model building and assembly process used to create a head gasket joint model, describe the nonlinear nature of the materials used in the model, and present comparisons of the modelís results with experimental measurements."

[STI: There is a gasket-specific material & element in 6.1, not available at the time of the writing]
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Average Rating: 9.2 (26 votes)  
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Non-linear Finite Element Modeling of the Titanium Briquettes Hot Extrusion Process
  Alexey I. Borovkov, Denis V. Shevchenko
  "In this paper the mathematical model is developed to perform mathematical simulation of the hot extrusion process. The model makes it possible to observe the influence of various system parameters on the extrusion process. All researches were carried out with the use of the ANSYS 5.6 RFS FE-software system. During the research the modeling and analysis of various events that can be observed (material dead zone appearing, capsule crimping, capsule damage etc.) was successfully carried out. The mathematical model was created on the basis of contact thermo-mechanics relations with physical and geometrical non-linearities."
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Average Rating: 10.0 (11 votes)  
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Non-Linear Problems Of Steel Civil Engineering Structures
  Milan Vasek
  "The civil engineering structures are today designed with respect to the limit state of serviceability and limit states of the strength and stability. The design of more efficient and light structures leads to the nonlinear analysis of deflections and stresses. Some parts of structure could reach the yield point under the design load. Some parts of structure could lose their local stability. These complex problems of a different nature are possible to solve by FEM methods."
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Average Rating: 8.0 (37 votes)  
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Nonlinear Contact Analysis Techniques Using ANSYS
  (ANSYS, Inc.)
  Presentation on various aspects of 17x contact technology (part of the "Advanced Analysis with ANSYS" seminar during the 2002 User's Conference).
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Average Rating: 10.0 (20 votes)  
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Nonlinear Stress Analysis and Optimization of a Welded Plate Steel Pro/ENGINEER Assembly
  Andrew J. Bax, Chris Andersen, Shane Vander Kooi
  From 1996 Conference
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Average Rating: 8.4 (37 votes)  
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Principles of Simulating Contact Between Parts using ANSYS
  David H. Johnson
  "The ANSYS finite element analysis (FEA) program offers a variety of elements designed to treat cases of changing mechanical contact between the parts of an assembly or between different faces of a single part. These elements range from simple, limited idealizations to complex and sophisticated, general purpose algorithms. FEA analysts are frequently faced with modeling situations where changing contact cannot be assumed negligible and ignored. Finding the best choices for contact elements, element options, solver, and solution options can drastically improve the modelís performance and reduce the analystís frustration with a contact simulation model."
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Average Rating: 9.3 (14 votes)  
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Seismic Simulation Of The Motorola SC4812ET RF And Power Cabinets Using Pro/Engineer and ANSYS
  Alan Herda, D. Allan Daggs
  "To prevent earthquake test failure and reduce cycle time, mechanical development engineering conducted seismic simulations in parallel with the design of a new outdoor cellular base station and accompanying battery cabinet. Finite element models of the Motorola SC4812ET RF (Radio Frequency) and Power Cabinets, weighing 1400 pounds and 3500 pounds respectively, were built and subjected to Bellcore Zone 4 earthquake loading using ANSYS finite element analysis software."
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Average Rating: 8.6 (14 votes)  
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Simulation Of An Ultrasonic Piezoelectric Transducer
  David Johnson, Dharmendra Pal
  "This paper presents the piezoelectric, coupled field capability of the ANSYS/Multiphysics product in both linear and nonlinear simulations. A piezoelectric transducer assembly is modeled, including a discussion of vendor-supplied property data as it relates to the ANSYS material input requirements. A cylindrical geometry is treated as an axisymmetric model using the PLANE13 element type. The transducer model is used in modal and harmonic analysis solutions to understand its mechanical behavior and to aid in design modifications to optimize its weight, performance, and electrical power consumption."
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Average Rating: 9.4 (17 votes)  
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Simulation of Brake Block Induced Corrugation on Railway Wheels
  Ulf Sellgren
  "Railway wheels that are equipped with cast-iron brake blocks generate significantly more rolling noise than wheels with other types of braking devices or block materials. The roughness of the treads on cast-iron block-braked wheels has typically a peak at a wavelength around 6 cm. The complex interaction between quasi-static and dynamic mechanical behavior and thermal, chemical, and metallurgical effects in the block-wheel contact combined with the rolling and sliding situation in the wheel-rail contact has made it difficult to get an understanding of the causes from field measurements. Coupled transient thermal and quasi-static mechanical FE simulations with ANSYS show that thermoelastic instability (TEI) may be a major cause for the roughness initiation."
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Average Rating: 8.8 (8 votes)  
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Super Elastic Alloy Eyeglass Frame Design Using the ANSYS Workbench Environment
  Peter R. Barrett and Patrick Cunningham (CAEAI)
  "Up front analysis at the concept stages of developing a device most often result in reduced time to market and a better more efficient product development cycle. Design Modeler (1) / DesignXplorer (2) and ANSYS Structuralís super-elastic material model (3) are used in this demonstration of a design process for an eyeglass frame. This example provides an illustration of using the parametric functionality of the ANSYS Workbench environment for a highly nonlinear application. The Workbench environment can be used to perform design iterations in conjunction with material laws only available in the standard ANSYS environment. A shape memory superelastic material law was formally included in ANSYS 8.0. The material law captures the super-elastic behavior of Nitinol (4) along with its unique hysteretic response under cyclic loading. In the demonstration, the eyeglass frame is subjected to crushing and cyclic loading events. Geometric design variables are varied in an attempt to increase the frame stiffness yet keep the peak strain levels in the frame below 10% strain, which is a typical elastic limit for Nitinol. The cyclic behavior of the material is also monitored under the design load to evaluate the potential of fatigue failure. The procedure demonstrates the ease in interfacing the suite of Workbench products with geometric, material and contact nonlinear analysis problems."

Presentation file also available here
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Average Rating: 3.3 (15 votes)  
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The Building Blocks of Simulation: A New Family of Elements for Stress Analysis
  (ANSYS, Inc.)
  Presentation on 18x family of elements (part of the "Advanced Analysis with ANSYS" seminar during the 2002 User's Conference).
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Average Rating: 0.0 (2 votes)  
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The Comparison of Biomechanical Breast Models: Initial Results
  C. Tanner, J.A. Schnabel, A. Castellano Smith, L.I. Sonoda, D.L.G. Hill, D.J. Hawkes, A. Degenhard,
  "We present initial results from evaluating the accuracy with which biomechanical breast models based on finite element methods can predict the displacements of tissue within the breast. We investigate the influence of different tissue elasticity values, Poissonís ratios, boundary conditions, finite element solvers and mesh resolutions on one data set. MR images were acquired before and after compressing a volunteerís breast gently. These images were aligned using a 3D non-rigid registration algorithm. The boundary conditions (surface displacements) were derived from the result of the non-rigid registration or by assuming no patient motion at the posterior or medial side. Three linear and two non-linear elastic material models were tested."
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Average Rating: 5.8 (6 votes)  
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Three Dimensional Turbulent-Incompressible Fluid Flow Analysis Of A Ranger QCT Control Valve
  Joseph W. Smith, Keith Black
  "Cashco, Inc., desired to determine whether or not a Computational Fluid Dynamic (CFD) model could accurately predict the fluid flow through a Ranger QCT Control Valve. ANSYS Revision 5.4 was used to create the finite element mesh, apply loads, solve, and evaluate the results of the fluid analysis. The results of the fluid analysis showed that ANSYS predicted the Flow Coefficient and Pressure Recovery Factor to within 10% and 2% of their experimental values, respectively." (Flotran) From 2000 Conference
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Average Rating: 9.3 (38 votes)  
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Three-Dimensional Modeling Of A Bolted Connection
  David Johnson, Richard Englund, Brian McAnlis, Kevin Sari, and David Colombet
  "Two-dimensional, axisymmetric models are used to study the interaction and stresses developed in the threads of a bolted connection. One problematic issue with this approach is that the 2D model simulates the threads as separate rings of material, not as the actual continuous helix. Therefore, two-dimensional modeling cannot simulate the conditions of joint tightening and sliding along the helical thread flanks when the nut is turned. In addition, the analyst must justify the 2D axisymmetric assumption as appropriate to this truly three-dimensional system. This paper presents the modeling technique used to create a "mostly-brick" meshed 3D model of a nut and bolt joint."
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Average Rating: 9.6 (28 votes)  
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Towards Automated Determination of USERMAT for the Nonlinear Constitutive Behavior of Composites
  J. Michopoulos, P. Mast, R. Badaliance, L. Gause, T. Chwastyk, R. Foerch
  "Recent advances in finite element techniques and design optimization integration technologies along with the parallel hardware and software evolution have directed the CMS group to turn its attention to utilizing "of the shelf" technology of achieving the same goals. Thus, the "Z-mat" and "Z-Optim" packages from Northwest Numerics, Inc., have been utilized to extract the non-linear constitutive response from the available experimental data in an integrated and automated manner and in conjunction with the ANSYS/Mechanical infrastructure. The automation lies on the fact that the process automatically generates the code of a "USERMAT" subroutine that it can be subsequently used with any geometry and loading specification definable within the limits of ANSYS' non-linear element library. The geometry of the single notched specimen of NRL's In Plane has been used for developing and verifying the process."
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Average Rating: 7.5 (8 votes)  
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Transient Behavior of a Polymer Fill Material with Time Dependent Viscoelastic Properties
  John Thompson, Steven Groothuis, Hong Tang, Paul Koeneman
  "In an effort to simplify the implementation of viscoelastic material models into ANSYS, an ANSYS User-Programmable Feature (UsrFictive) has been modified to allow a more practical definition of viscoelastic material parameters. Standard ANSYS input of material data may be based upon temperature. Currently, ANSYS material data may not be a function of any other parameter. Many polymers used in industry are initially liquid and must be ďcuredĒ in a manufacturing process. This fact means that the properties will change over time. This application demonstrates one method of implementing a curing process simulation for a viscoelastic polymer."
[ANSYS Nonlinear, version 6.?]
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Understanding Accuracy and Discretization Error in an FEA Model
  Jon Pointer
  "The often-ignored topic of mesh discretization error is examined to identify a simple set of rules that the average user can enlist to determine solution accuracy. The sources of discretization error are explained, tools to quantify it are introduced and an example is given. The purpose is to bring an understanding of these issues and usable tools to the common user who is not proficient in the mathematical basis of FEA."
[ANSYS 7.1, 2004 Conference]
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Average Rating: 10.0 (4 votes)  
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USERMAT
  Document describing the USERMAT user material subroutine.
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Average Rating: 9.3 (45 votes)  
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Using ANSYS-Based Aluminum Reduction Cell Energy Balance Models to Assist Efforts to Increase Lauralco's Smelter Productivity
  Marc Dupuis and Claude Fradet
  "State of the art ANSYS-based aluminum reduction cell energy balance models have been successfully used to assist efforts to increase Lauralco's smelter productivity by improving cell thermo-electric design."
From 1998 Conference
PDF version here
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Average Rating: 8.1 (8 votes)  
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Viscoelasticity
  (ANSYS, Inc.)
  Presentation on the viscoelasticity model, introduced in ANSYS 6.1, available for both hypo- and hyper-elasticity (part of the "Advanced Analysis with ANSYS" seminar during the 2002 User's Conference).
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Average Rating: 8.5 (23 votes)  
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