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

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- [ ] Add a material to keep track of the history maximum of the fracture driving energy - [ ] Add the model-dependent threshold for prevent negative damage

- [ ] thick initial crack, row of elements - [ ] support initial crack of arbitrary geometry - [ ] support initial history field

- [ ] add optional correction to Gc - [ ] add optional correction to the crack length in ICs

- [ ] Custom problem for KL expansion - [ ] Assembly of the covariance matrix - [ ] Assembly of the mass matrix - [ ] Solve the generalized...

- [ ] Support modification of the degradation function

Start to implement the variational case of the nucleation model, see https://github.com/hugary1995/raccoon/issues/158#issue-2105908769. Not test yet.

![image](https://github.com/hugary1995/raccoon/assets/135033854/a5f125ba-d6e9-44ff-8038-91593e8bf78e) Do i need to start from step 2 only ? On starting from step 1 in one of the devices i installed mini conda again and it removed the...

just to update some object parameter names, function names so that they stop throwing warnings. Changes include but not restricted to: 1. The RankTwoTensor initializer in `PhaseFieldJIntegral` 2. The "f_name"...

## Reason See [A variational formulation of Griffith phase-field fracture with material strength](https://arxiv.org/abs/2401.13938v1) by C. J. Larsen, J. E. Dolbow, O. Lopez-Pamies. This is a variational recast of the phase-field...

## Bug Description I am trying to solve elastodynamic part explicitly with Central difference time integrator, but getting DIVERGED_PC_FAILED errors: ``` Time Step 1, time = 2e-05, dt = 2e-05...