On 7/17/24 09:15, Vinayak Vijay wrote:
In line 63, the differentiation of the energy function (psi_sd) with respect
to left cauchy green tensor (b_sd) results in the Kirchhoff stress tensor
tau_sd = zero tensor. I believe this is due to the fact that tau_sd is stored
as a function of F_sd (symbolic deformation gradient) and is therefore unable
to recognise the dependence with b_sd (symbolic left cauchy green tensor).
How can i resolve this issue? Thanks in advance.
If I understand your question right, you have a function
f(x)
and you are computing
d/dy f(x)
which is indeed zero because you have not said anything about how x and y are
related. If x can be expressed as a function of y, say x=g(y), then you need
to tell the autodifferentiation machinery that your function f is really
f(g(y))
i.e., everywhere where you previously used x, you need to replace it by g(y)
to make it clear that f is a function of y.
Does this help?
Best
W.
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Wolfgang Bangerth email: [email protected]
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