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- Thread starter Mrx1
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In summary, Poisson's ratio is used in determining stress by considering the relationship between stress and strain. When an object is stretched in one direction, it shrinks in the two perpendicular directions, known as the Poisson's ratio effect. This concept is important for implementing the material point method in benchmark problems. The stiffness matrix is a crucial component in obtaining accurate results for plane stress and plane strain, which have different stress strain formulas.

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Thank you so much for your answer I'm a student and trying to implement the material point method so I have the following problem as a benchmark

Did I get the stiffness matrix right? Cos that's the only thing I can think of for getting the same results

Did I get the stiffness matrix right? Cos that's the only thing I can think of for getting the same results

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no worries. for plane stress and plane strain, the stress strain formulae are different

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