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ST71.20.40.16 Basic Material Nonlinear Analysis
This Webnote gives a brief summary of material nonlinear analysis and showcases a simple example.
To start a material nonlinear analysis, a stressstrain curve is usually required. A typical stressstrain curve for low and medium carbon steels is shown below, with part of the curve exaggerated for clarity.
For stresses up to the proportional limit, stress will be linearly proportional to the strain according to figure 1. If the stress exceeds the proportional limit then material nonlinear...

