### 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.

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.

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Güemes 3450

S3000GLN Santa Fe, Argentina

Phone: 54-342-4511594 / 4511595 Int. 1006

Fax: 54-342-4511169

E-mail: amca(at)santafe-conicet.gov.ar

**Asociación Argentina de Mecánica Computacional**Güemes 3450

S3000GLN Santa Fe, Argentina

Phone: 54-342-4511594 / 4511595 Int. 1006

Fax: 54-342-4511169

E-mail: amca(at)santafe-conicet.gov.ar

**ISSN 2591-3522**