Resumo

GARCIA GARINO, C.  e  PONTHOT, J.-P.. A quasi-coulomb model for frictional contact interfaces: Application to metal forming simulations. Lat. Am. appl. res. [online]. 2008, vol.38, n.2, pp.95-104. ISSN 0327-0793.

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 non associated plasticity approach to Coulomb law a non-symmetric tangent operator results, 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 Oliver (1992) 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 considered.

Palavras-chave : Friction; Contact; Plasticity; Large Deformations; Metal Forming.

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