Contact Laws
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Introduction
NairnMPM and OSParticulas implement contact physics on crack surfaces and between materials in multimaterial mode by using contact laws. Each contact law can define [#Frictional Contact Laws|frictional contact]] or describe an imperfect interface. Contact laws are assigned to crack and material surfaces by using the ContactCracks and ContactMM commands, by using the Contact material property, or by choosing a custom contact law in the NewCrack command. This section explains the possible contact laws.