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You have to be careful when you talk about plasticity, because you're not really allowed to carry over any of your elasticity parameters. Poission's ratio, $\nu$, is a parameter in the stress-strain relationship for isotropic, linear elasticity only. Poisson's ratio has no part in plasticity calculations. Since you're likely looking at polycrystalline metal ...

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In general, polymers are not a good idea as atomic oxygen and charged particles will eat them up. High density polyethylene, however, may form a protective oxidative coating against atomic oxygen (source). I would argue that it's still worth depositing a thin film of a metal that forms a nice protective oxide layer, e.g. Al, which would also prevent charge ...

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First, I'm going to define some notation. I prefer the direct notation of modern continuum mechanics as presented in this book by Gurtin et al., so I won't be carrying around the indices that you use. Lastly, the following holds for small deformation, rate-independent plasticity with isotropic hardening. $\mathbf{T}$ = Cauchy stress tensor \$\mathbf{T}_0 = ...

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The go to formula in pressure vessel design is the semi-empirical NASA SP-8007. Page 7, & 10 tell you most of the annotation used in the rest of the document, page 14 has the equation for isotropic cylinders. Personally, I've mostly used the composites formulas in the back. The long explanation is that due to poor experimental results, a cylinder will ...

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