I molded a simply supported beam (as shell element) under uniform downward load.
But dont know why s33 is zero while s22 has obvious stress profile?
In my understanding, s33 (should be in z direction) should be bending stress(normal stress), it should not be zero under bending.
Tamirat Semu Yihune
https://www.hsh.info/articl14.htm#:~:text=This%20means%20that%20the%20third,listed%20for%20the%20plate%20element.
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Victor J. Аdlucky
Stress components are reported in local coordinate system. The default local 1-direction is the projection of the global x-axis onto the element surface. If the global x-axis is within 0.1° of being normal to the surface, the local 1-direction is the projection of the global z-axis onto the element surface. The local 2-direction is then at right angles to the local 1-direction, so that the local 1-direction, local 2-direction, and the positive normal to the surface form a right-handed set. The positive normal direction is defined in an element by the right-hand rotation rule going around the nodes of the element. Out-of-plane stress S33 is reported as zero.
The conventions used in Abaqus for shell elements are as follows.
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