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Structural Eigenvalue Buckling Input Files (4 entries)
 
ARCH_BUCK
  Sheldon Imaoka (CSI)
  Buckling of arch (example of use of pressure load stiffness matrix)
For many eigenvalue (and nonlinear) buckling problems, inclusion of the pressure load stiffness matrix (BEAM188/189, SHELL181, SURF154) significantly affects results. For nonlinear buckling problems, this may also affect convergence rate.
* Theoretical: 771.12
* SHELL93 only (1st eig 840.73)
* SHELL181 only (1st eig 771.72)
* SHELL93 & SURF154 (1st eig 771.07)
* SHELL93 & SURF154, face 4 (1st eig 840.78)
Change "COMPTYPE" parameter to run above 4 cases.
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Average Rating: 9.1 (434 votes)  
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ELBOW290
  Sheldon Imaoka (ANSYS, Inc.)
  Attached is a simple, made-up example demonstrating use of ELBOW290 elbow element. There are 3 layers defining the pipe (plasticity and hyperelasticity). The pipe is rotated until local buckling occurs. An image of the file shape (showing the pipe in 3D) is here.
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Average Rating: 7.8 (9 votes)  
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IBEAM_181
  Sheldon Imaoka (CSI)
  Lateral torsional buckling (example of use of WARP DOF for BEAM188/189)
For an I-beam, considering WARP DOF (in 5.6) is important (i.e., unrestrained or restrained warping). Consider the I-beam modeled with BEAM188 elements or with SHELL181:
* BEAM188 (Unrestrained warping) -- 387.3
* BEAM188 (Restrained warping) -- 569.6
* SHELL181 (concentrated load) -- 560.8
* SHELL181 (distributed load) -- 564.1 (similar to beam case)
This input file uses SHELL181.
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Average Rating: 9.3 (97 votes)  
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IBEAM_188
  Sheldon Imaoka (CSI)
  Lateral torsional buckling (example of use of WARP DOF for BEAM188/189)
For an I-beam, considering WARP DOF (in 5.6) is important (i.e., unrestrained or restrained warping). Consider the I-beam modeled with BEAM188 elements or with SHELL181:
* BEAM188 (Unrestrained warping) -- 387.3
* BEAM188 (Restrained warping) -- 569.6
* SHELL181 (concentrated load) -- 560.8
* SHELL181 (distributed load) -- 564.1 (similar to beam case)
This input file uses BEAM188.
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Average Rating: 9.0 (125 votes)  
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