of.mat.contact

of.mat.contact default | element <element_tag1> <element_tag2> *material_type* <string> parameter_keyword1 <string> parameter_value1 <double> …

Assign contact material parameters. Use default for the global default contact material, or use element followed by two element-group tags to assign a material to a specific pair of element groups. The details of materials in OpenFDEM can be found in the table below.

Material type	Constitutive keyword	Parameter keywords	Units
Mohr-Coulomb Slip	MC	friction - friction
		kn - normal stiffness, will be assigned by default \[pn = \lambda(K_{1} + K_{2})/2\]	Pa
		ks - tangential stiffness, will be assigned by default \[pn = \lambda(G_{1} + G_{2})/2\]	Pa
Rate dependent Mohr-Coulomb Slip	rMC	To be added in the tutorial, if you want to use this model, contact the developer
Giovanni Grasselli rough shear contact	roughshear	friction - friction
		kn - normal stiffness, will be assigned by default \[pn = \lambda(K_{1} + K_{2})/2\]	Pa
		ks - tangential stiffness, will be assigned by default \[pn = \lambda(G_{1} + G_{2})/2\]	Pa
		theta -parameter
		C -parameter
		A0 - parameter
		B -parameter
		tension - tension strength
Dynamic Mohr-Coulomb Slip	dMC	s_friction - static friction
		d_friction - dynamic friction
		slip_rate- slip rate	/s
		kn - normal stiffness, will be assigned by default \[pn = \lambda(K_{1} + K_{2})/2\]	Pa
		ks - tangential stiffness, will be assigned by default \[pn = \lambda(G_{1} + G_{2})/2\]	Pa
Hertz contact model	HERTZ	To be added in the tutorial, if you want to use this model, contact the developer
Friction	FRICTION	To be added in the tutorial, if you want to use this model, contact the developer

Example:

of.mat.contact 'default' MC 0.3
of.mat.contact element 'up' 'rock' MC 0.0

For a pair of element groups, the literal keyword element is required. The old form of.mat.contact 'up' 'rock' ... is not a valid 4.35 alternative: the parser interprets the first quoted token as the contact material category, and it is therefore rejected unless it is default, element or cohesive.