Interactive help on using the xMat

Defined in publication from von Wolffersdorff (1996)
Extension for intergranular strain from Niemunis and Herle (1997)
Expects the following sixteen material parameters:
- 1: $\varphi_c$ (rad),
- 2: $u$ ,
- 3: $h_s$ (kPa),
- 4: $n_H$ ,
- 5: $e_{d0}$ ,
- 6: $e_{c0}$ ,
- 7: $e_{i0}$ ,
- 8: $\alpha_H$ ,
- 9: $\beta_H$
- 10: $m_T$ ,
- 11: $m_R$ ,
- 12: $R_\mathrm{max}$ ,
- 13: $\beta_R$ and
- 14: $\chi$
Uses eleven state variables:
- 1: void ratio
- 2-10: intergranular strain $h_{11}$ , $h_{22}$ , $h_{33}$ , $h_{12}$ , $h_{21}$ , $h_{23}$ , $h_{32}$ , $h_{13}$ and $h_{31}$
- 11: replacement stiffness
Void ratio should be initialized as state variable. If it is not provided, it can optionally be passed as sixteenth material parameter instead