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 [Felt-users] Using a `natural size' constraint? From: Edward Rosten - 2006-10-16 21:24:40 ```Hi All, I've read the manual sections on static analysis, but I can't figure out the following problem. In 1D it is this: s1 o-----/\/\/\/\/\/\-------o | | X-----/\/\/\/\/\/\-------o s2 The natural lengths of s1 and s2 are known but different. Points marked X are fixed (this thing can't just go drifting round the universe). The spring constants of s1 and s2 are known. What is strained length of s1 and s2? The problem is I can't figure out how to enter this constraint. I have the 3D version of this problem in practice. I have two plates bonded together, but made of different materials. On heating, they expand at different rates. The temperatures are constant, and I know the expansion coefficients, so I know the natural size. What I'd like to get at is the strain in the plates due to the mismatch in sizes. But I can't figure out how to formulate the problem. Can anyone suggest how? I apologize if I've made a mistake, it's been a while since I did any finite element analysis. The problem is all linear and static. -Ed ```

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