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Hourglassing and Shear locking

Submitted by arsha_0o on

Hello,

My question is about using second order elements in a 3D problem. Imagine that we are appling bending moment on a beam. If we only use 1element in the thickness, I dont understand why:

1) in reduced integration element (C3D20R) we still have hourglassing

2) in full integration element (C3D20) we still have shear locking.

 

Thanks