# Tag Info

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A shell element has zero thickness but two sides called top and bottom. In Workbench you have to choose on both contacting shells the side that faces the other shell in order to achieve a working contact. If the faces are chosen incorrectly, the contact will not work.

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Shear strain is defined as the angular deformation caused due to parallel or shearing force. In structural engineering, there are two cases of shear strains that are of particular concern. The occurrence of each depends on the loading that causes shear deformation as indicated below. 1) Shear Strain due to Pure Shear 2) Shear Strain due to Shear Deformation ...

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Try to increase the iteration count in each step. You can follow this video to solve this issue. https://www.youtube.com/watch?v=mQ09lt8yRtc&t=2s

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Forces do not disappear without resistance. For a statically balanced system, globally, the sum of the applied Forces must equal to the sum of the resistance forces, so the number, and size of the mesh will not affect the result. However, the number and size of the mesh will affect the pattern of the internal forces/stresses. Usually, it is advisable to ...

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"Geometric nonlinearity" is a confusing term, because it can include two separate effects. In general you can write the global stiffness matrix of the structure as the sum of three terms: $K = K_e + K_\sigma + K_L$. $K_e$ is the elastic stiffness, resulting from the stress-strain relationships in the material. For a linear elastic material it ...

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It does not directly have anything to do with the stiffness matrix. But the geometric constraint caused by the friction is a external force that is affected by the deformation of the object.* Since the contact changes as the object deforms then the frictional force changes by the deformation. Again it becomes nonlinear as the problem to be solved changes ...

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Found the solution. Looks like there is a bug in Nastran where if it doesnt see enough space in your C: drive (even if your scratch directory is in your D: drive), it just hangs. Once I cleared out some space in my C: drive (AND restarted my computer) then it started working.

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In the plastic range, the stress-strain relationship is non-linear as shown in the graph below. With consideration of geometric changes after yield, the true stress-strain curve (dotted line in the graph) shall be used instead of the normal curve, and non-linearity needs to be considered in the analysis. Note: Due to the shrinking of section area and the ...

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