1st order
reduced-integration elements actually shear too much called 'hourglassing',
so this can be a problem. Hourglassing can be a problem with
first-order, reduced-integration elements (CPS4R, CAX4R, C3D8R, etc.)
in stress/displacement analyses. Since the elements have only one
integration point, it is possible for them to distort in such a way that the
strains calculated at the integration point are all zero, which, in turn, leads
to uncontrolled distortion of the mesh. First-order, reduced-integration
elements in Abaqus include hourglass control, but they should be used with
reasonably fine meshes. Hourglassing can also be minimized by distributing
point loads and boundary conditions over a number of adjacent nodes.
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