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ST7-1.57.10.2 Brick Element Material and Geometric Nonlinearity
The stress values reported at the Gauss points in material nonlinear brick elements can exceed the corresponding values on the stress-strain curve when geometric nonlinearity is included in the analysis, even for a fully converged increment. This Webnote uses the simple example of a cylindrical bar subjected to a uniaxial load to describe the reasons for this.
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