Make mechanical properties a function of stoichiometry and sometimes temperature

[aabills]

Description

For many chemistries, notably high-nickel NMCs and graphite, the volume change associated with intercalation is a strong function of stoichiometry. Here, I have taken the r-averaged value for Ω and used it to calculate total stress. This accounts for the change without violating the initial model assumptions.

This is the same as #2943 but it was easier to start over than just update that one

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes # (issue)

Type of change

Please add a line in the relevant section of CHANGELOG.md to document the change (include PR #) - note reverse order of PR #s. If necessary, also add to the list of breaking changes.

• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Optimization (back-end change that speeds up the code)

Key checklist:

• No style issues: $ pre-commit run (or $ nox -s pre-commit) (see CONTRIBUTING.md for how to set this up to run automatically when committing locally, in just two lines of code)
• All tests pass: $ python run-tests.py --all (or $ nox -s tests)
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• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ebacf49) 99.59% compared to head (0fd0385) 99.58%.
Report is 6 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3576      +/-   ##
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- Coverage    99.59%   99.58%   -0.01%     
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  Files          257      257              
  Lines        20639    20661      +22     
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+ Hits         20556    20576      +20     
- Misses          83       85       +2     

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[aabills]

I could be wrong, but it's hard for me to imagine how these regressions could be related to this PR

[agriyakhetarpal]

I could be wrong, but it's hard for me to imagine how these regressions could be related to this PR

The benchmarks on PRs are not reliable a lot of the times especially on GitHub Actions runners, it's usually good to re-run them if there is a chance of a regression being introduced

[aabills]

I mean, I don't think these regressions are even running any of my code -- can someone rerun please if this is blocking?

[valentinsulzer]

Looks good, please update changelog

[valentinsulzer]

while we're here, could Omega also depend on T?

[aabills]

No, that would be a thermal expansion coefficient, generally called α

[aabills]

I mean I guess they're the same thing really, but in some ways that's an entirely different model.

[aabills]

I'll do it anyway