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Fix issue with singular matrix for finite strain uniaxial response#20

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KnutAM merged 6 commits intomainfrom
kam/finitestrainuniaxialstressfix
Apr 29, 2026
Merged

Fix issue with singular matrix for finite strain uniaxial response#20
KnutAM merged 6 commits intomainfrom
kam/finitestrainuniaxialstressfix

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@KnutAM KnutAM commented Apr 24, 2026

This changes how stress iterations for finite strains work by iterating on the Kirchhoff stress (which is symmetric) instead of the unsymmetrical 1st PK stress. The unknowns are still the deformation gradient, but gauge conditions are added to prevent rotations.

@KnutAM KnutAM linked an issue Apr 24, 2026 that may be closed by this pull request
@KnutAM KnutAM merged commit b676775 into main Apr 29, 2026
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@KnutAM KnutAM deleted the kam/finitestrainuniaxialstressfix branch April 29, 2026 07:24
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Finite strain uniaxial stress

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