feat add bilinear hardening and neo-hookean hyperelasticity models

[rmanno91]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 18.64407% with 96 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.25%. Comparing base (41869f8) to head (7e40dba).
⚠️ Report is 1 commits behind head on rmanno/refactor_with_visitor.

❌ Your project check has failed because the head coverage (59.25%) is below the target coverage (80.00%). You can increase the head coverage or adjust the target coverage.

❗ There is a different number of reports uploaded between BASE (41869f8) and HEAD (7e40dba). Click for more details.

HEAD has 7 uploads less than BASE

Flag	BASE (41869f8)	HEAD (7e40dba)
	8	1

Additional details and impacted files

@@                        Coverage Diff                        @@
##           rmanno/refactor_with_visitor     #430       +/-   ##
=================================================================
- Coverage                         81.39%   59.25%   -22.14%     
=================================================================
  Files                                61       62        +1     
  Lines                              2128     2236      +108     
=================================================================
- Hits                               1732     1325      -407     
- Misses                              396      911      +515     

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