drucker-prager

bulk f

bulk modulus, \(K\)

cohesion-drucker f

material parameter, \(k_{\phi}\)

dilation-drucker f

material parameter, \(q_{\psi}\). The default is 0.0.

friction-drucker f

material parameter, \(q_{\phi}\)

poisson f

Poisson’s ratio, \(\nu\)

shear f

shear modulus, \(G\)

tension f

tension limit, \({\sigma}^t\). The default is 0.0.

young f

Young’s modulus, \(E\)

Notes:

• Only one of the two options is required to define the elasticity: bulk modulus \(K\) and shear modulus \(G\), or Young’s modulus \(E\) and Poisson’s ratio \(\nu\). When choosing the latter, Young’s modulus \(E\) must be assigned in advance of Poisson’s ratio \(\nu\).
• The tension cut-off is \({\sigma}^t = min({\sigma}^t, k_{\phi} / q_{\psi})\).