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How to detemine the tangent module (DDSDDE)

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Lemine

Lemine

Mechanical
Joined
Apr 15, 2020
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45
Location
FR
Hello,
Can anyone give me an idea of how to determine the tangent module of this behavior law:
constitutive-law_llp8gh.jpg

after simplification I found the equation system:
eq3_r74d82.jpg

and after using the central difference method the schema is:
eq4_fvtyn8.jpg

I would be so thankful if you can help me
 
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