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# Computation micro-mechanics
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In the computational micromechanics, we need to evaluate the stress tensor **P**(t) as a function of the strain path **F**(t). The nonLinearMechSolver allows obtaining this relation by different ways.
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## 1. Using a microscopic boundary condition
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### 1.1. Mesh
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1. Finite element mesh
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2. OK
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* OKOK
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- TT
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Inline-style (hover to see title text):
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## 2. Using macroscopic BC
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OK $`a^2+b^2=c^2`$, one has
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```math
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a^2+b^2=c^2
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```
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