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EXPANSION
  Sheldon Imaoka (ANSYS, Inc.)
  This is a description of an ANSYS Workbench 13.0 project and the use of the HSFLD242 (hydrostatic fluid) element. It is a fictitious model of the expansion of a tire and subsequent displacement-loading to a rigid surface (e.g., ground). The Workbench archived project is here.
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Average Rating: 9.8 (23 votes)  
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INISTATE
  Sheldon Imaoka (ANSYS, Inc.)
  This is a very simple example using Workbench Mechanical 12.0.1 to demonstrate use of the INISTATE command in defining initial stress.

Open Workbench 12.0.1 (or 12.1) and use "File > Restore Archive ..." and select the zip file to open the model. Solving should take less than a minute.

The model is a simple bar. The first analysis branch has 10e3 psi initial stress only in the x-direction.
Notice that the block is free to expand - it only has symmetry boundary conditions.
The final results show basically zero stress and displacement of -8.1455e-4 inches.
Since initial stress is 10e3 and elastic modulus is 29e6 with a length of 2.3622 inches:
10e3 / 29e6 * 2.3622 = 8.1455e-4
which is the same answer as given by ANSYS.

The second analysis branch also has 10e3 psi initial stress only in x-direction.
However, there is a Frictionless Support preventing the block from expanding.
Final results show displacement basically of zero, and stress of 10e3 psi.
This is because the initial stress cannot relax due to the boundary conditions, so the final stress = initial stress in this particular case.
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Average Rating: 8.8 (30 votes)  
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ROLLER
  Sheldon Imaoka (ANSYS, Inc.)
  Simple example of a hollow metal pipe being bent by rollers. Rigid-deformable contact, metal plasticity, use of Joints (MPC184) are in the Workbench Mechanical 12.1 model.
An animation of this can be found on the gallery page.
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Average Rating: 8.2 (11 votes)  
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WIREBOND
  Sheldon Imaoka (ANSYS, Inc.)
  Simple Workbench Mechanical 13.0 example of a ultrasonic wire bonding tool. The piezoelectric stacks are prestressed with a bolt and driven at a given frequency (in this case, resonance is around 59 kHz). Project includes prestressed modal and prestressed harmonic response analyses.

To run this analysis, be sure to set the environment variable WB OLD PRESTRESS first since piezoelectric elements are not supported with the newer PERTURB method.
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Average Rating: 9.2 (12 votes)  
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WOOFER
  Sheldon Imaoka (ANSYS, Inc.)
  Fictitious example of an acoustic analysis of a speaker in an archived ANSYS Workbench 13.0 project. Voice coil is excited with unit force; pressure is measured in front of speaker.

In Workbench, turn on beta features in order to be able to postprocess acoustic pressure.

Instead of performing a harmonic sweep, an analysis of a single frequency is set up. The Workbench Parameter page is then use to run a frequency sweep, where the PML (perfectly matched layers) region and buffer region size, along with mesh density, is adjusted for each frequency. This is done because if a single mesh for a large frequency range is used, the PML region would need to be as large as to accommodate the lowest frequency of interest while the mesh needs to be fine enough to capture the response of the highest frequency of interest — a large domain and small element size would result in inefficient solution times. By using Workbench Parameters, the mesh can be adjusted uniquely for each frequency. Higher-order FLUID220 and FLUID221 are used.
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Average Rating: 9.7 (37 votes)  
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