A Quasi Coulomb Model for Frictional-Contact Interfaces

Abstract

Frictional contact interfaces have to be modeled in practice when industrial problems such as metal forming operations,
crashworthiness, and so on, have to be simulated. Usually a Coulomb model is used in order to describe the constitutive
law for the frictional case. Following a standard plasticity approach to Coulomb law a non-symmetric tangent operator
is found, and so a non-symmetric solver has to be used in order to take full advantage of consistent operators. With
respect to symmetric ones, these non-symmetric operators lead to prohibitive computational times. However, in practice
different schemes have been proposed in order to recover the symmetric operator, and consequently, use a symmetric
solver. In this work an alternative approach based on an idea due to García Garino and Oliver33 is defined in order to avoid to deal with non-symmetric solvers and thus save a large amount of computational time, which renders the computational simulation more attractive to industry. Applications to metal forming simulations and crashworthiness
analysis are envisaged.