Common Traction Law Properties

These traction law properties are common to all types of traction laws used in MPM simulations, although not all properties will be used by all traction laws.

Traction Failure Properties

The common properties all deal with conditions for failure of the traction loading.

Property	Description	Units	Default
JIc	Mode I toughness or area under the opening mode traction law	J/m2	none
JIIc	Mode II toughness or area under the sliding mode traction law	J/m2	none
sigmaI	Peak traction in the mode I (or opening mode) traction law	MPa	none
sigmaII	Peak traction in the mode II (or sliding mode) traction law	MPa	none
delIc	Critical crack opening displacement for the mode I (or opening mode) traction law	mm	none
delIIc	Critical crack opening displacement for the mode II (or sliding mode) traction law	mm	none
nmix	The n parameter is the mixed-mode failure criterion. Using nmix<0 it creates a decoupled failure criterion where the traction law fails when either mode I or mode II traction reaches their critical COD	none	1

Some traction laws may require more properties to define their shape and failure and may redefine the meanings of these property. Refer to each traction laws definition for the specifics.