Much of the current StressCheck Professional code base is single-threaded, though over time ESRD is working to improve as much of the code as possible to be multi-threaded.

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Some StressCheck users may experience decreased model performance and/or integrity in certain situations. The following may be considered as potential reasons:

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In StressCheck, Triangle (3-sided) elements and Quadrilateral (4-sided) elements are available for meshing geometric surfaces and curves for subsequent engineering simulations. The following are the requirements (and limitations) for using Triangle and/or Quadrilateral elements in Planar, Extrude, Axisymmetric and 3D analyses.

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Although one can connect elements of different references, elements of different references should not be connected (e.g. 1D Beams—>2D Quads or 2D Tris—>3D Pentas) without extreme care. This is because the theory of elasticity requires consistent references (1D, 2D, or 3D) for exact elasticity solutions.

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The term "p-extension" refers to the process of systematically and hierarchically increasing the polynomial order of the element shape functions on a fixed mesh, thereby increasing simulation degrees of freedom (DOF) and representing more complex displacement fields for the mesh.

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Before we explore the answer to this question, let’s review a two important definitions regarding finite element method implementations: Mapping and Isoparametric Elements.

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In general, it is recommended not to exceed a polynomial level (p-level) of p = 5 when solving a model with quadratically mapped (i.e. "Isoparametric" or "Isopar") elements.

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In StressCheck, mixed mapping refers to the situation where isoparametric/quadratic and geometric (high order blended function) element mappings coexist within the same mesh.

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Element distortion refers to the difference between the shape of a standard element (a perfect cube in the case of a hexahedral element for example) and the shape of the element in the mesh. The transformation between the standard element and the element in the mesh is called mapping.

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After the solution is complete, the final p-level of each solved element may be displayed/tabulated:

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