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Linear strain limit

Dear all,

One of the consistency conditions of
the Ogden model is that sum(μ)= initial classic shear modulus. To
apply this condition, I need to calculate slope of stress-strain
curve (of an experimental dataset). I do not know up to which level of
strain I can consider this curve as a linear elastic model to find E
(that can be used to calculate shear modulus).

I’ve seen in one book this can be
considered for e<3%. Unfortunately I could not remember which book
was that. Do you know a standard for this
assumption?

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