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# Untitled

a guest Feb 22nd, 2019 64 Never
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1. The von Mises yield criterion is
2. \label{b1}
3.     f = (3J_2)^{1/2}-\sigma_y = 0
4. Assume that the stress states above are calculated with a linear elastic
5. analysis. Which of the stress states A to D above will give a plastic
6. deformation? The effective stress $\sigma_{eff}$ is defined by:
7. \label{b1}
8.   \sigma_{eff} = (\frac{3}{2}S_{ij}S_{ij})^{1/2}
9. The material yields at $\sigma_{eff} = 2000$ MPa.
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