[MPM] fix calculation of incremental deformation gradient#13632
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VeronikaSinger merged 5 commits intomasterfrom Jul 23, 2025
Merged
[MPM] fix calculation of incremental deformation gradient#13632VeronikaSinger merged 5 commits intomasterfrom
VeronikaSinger merged 5 commits intomasterfrom
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@KratosMultiphysics/mpm can someone please approve? |
ncrescenzio
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Jul 23, 2025
Dom-Weiss
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Jul 23, 2025
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Hi all,
this PR fixes the calculation of the incremental deformation gradient in the updated Lagrangian element.
Instead of the current inverse Jacobian, the inverse Jacobian of the undeformed background grid element is required when updating the incremental deformation gradient by
DF=I+Grad u
By that approach, both methods
I) DF=J * J0^-1
II) DF=I+Grad u
of calculating the incremental deformation gradient are equivalent.