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Massively parallel FEM code for phase-field for fracture by Dolbow Lab at Duke University

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``` *** ERROR *** A 'SmallStrainDegradedElasticPK2Stress_StrainSpectral' is not a registered object. *** ERROR *** A 'FixedPointProblem' is not a registered object. *** ERROR *** A 'ADPFFBarrier' is not a registered...

- Add domain form J integral - Add J integral correction term due to pressure - Rename PhaseFieldJIntegral to JIntegralContourIntegral - Add a tutorial for J integral close #121

## Reason Domain form J integral is more flexible and accurate. It also plays nicely with phase-field regularization. ## Design Add two new classes for domain form J integral. One...

pull request to add several material and kernel source files as well as a benchmark problem for pressurized fracture.

- [x] Add more examples/tutorials - [x] Complete documentation - [x] Complete theory manual: brittle fracture - [x] Complete theory manual: cohesive fracture - [x] Complete theory manual: ductile fracture...

- [x] Extend the compressible Neo-Hookean model - [x] Extend the hypoelastic models in tensor_mechanics - [x] Support hardening laws: power-law - [ ] Support hardening laws: exponential - [x]...

- [x] Pressurized crack - [ ] Poroelasticity - [ ] Porous flow

## Reason ## Design ## Impact

Each strain measure and stress measure should support some splits if possible. The stress calculators are also responsible for compute the elastic energy. - [x] Add large strain measures: Green-Lagrangian...