Structural Mechanics Calculation for Strain

[KarasTomas]

Implementation of strain funkcionality based on the Issue #33.

There are still some topics that needs to be discussed:

• Work with true or engineering strain
• Implement calculations for simple strain cases (uniaxial, no shear) for faster compute time
• version of Von Mises (component or principal strain based)
• What other methods of signing to implement

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

[Vybornak2]

in stress version stress_vector_voigt is used while in strain strain_voigt. This should be unified. I suggest vector version.

test for test_calc_signed_von_mises_by_max_abs_principal utilize second invariant of deviatoric stress as tests for stress version do, but I am not sure about this formula for strain variants. Please check this (potentially mistake could be in stress version too)

[KarasTomas]

Added the requested changes. There are still few comments that need discussion.

[KarasTomas]

Moved to a branch sm_strain_dev in my fork. The test as well.

[Vybornak2]

@KarasTomas
I suggest following:

1. create discussion whether to include planar stress / strain calculations, principal versions etc.
2. based on WG6-Crosscollaboratioin Excel or in collaboration with @JanHPapuga find proper contacts to review strain functions, true vs engineering strain

Addressing issues - Quote:

Implementation of strain funkcionality based on the Issue #33.

There are still some topics that needs to be discussed:

• Work with true or engineering strain
• Implement calculations for simple strain cases (uniaxial, no shear) for faster compute time
• version of Von Mises (component or principal strain based)
• What other methods of signing to implement

[Vybornak2]

@KarasTomas review is required as I pushed last change - merge, please review it (just a formality), so we can close this PR.

[KarasTomas]

PR is ready for merge.