Abstract
Faced with the growing importance taken by contact phenomena with friction in many problems issued from structural mechanics (metal forming, structure assembling, cracking,...) a great number of big finite element codes have developed modules treating these very special limit conditions. Modelisation of friction together with an appropriate numerical treatment is a difficult problem which remains largely open. Future developments in this domain will have to rest on a strong concertation between structural mechanicians, tribologists, mathematicians, numerical analysts and physicists from industry.
However during this past decade a mathematical formulation together with numerical methods appropriate to Coulomb friction models with unilateral contact has been developed. Corresponding numerical procedures are or may be introduced into Finite Element codes and are to be compared to methods more directly inspired by the physics of the problem such as contact finite elements (evanescent third body) or iterative procedures on the boundary conditions.
A formulation in terms of a variational inequality may in turn be solved in different ways. We present here one of these, underlining its advantages and disadvantages with regard to other approaches. It consists of a diagonal fixed point algorithm based on a “Gauss-Seidel projected overrelaxed method” together with several adjustments which enable to gain in performance. This method is developed in the code PROTIS at the L.M.A. and also introduced in different large scale codes (MODULEF, EVPCYCL).
The performances of a numerical method associated to a given formulation have to be appreciated under different angles. There is not only the precision (in the phenomenon’s description) or the cost of the computation (a factor wich tends to be not essential) but also the facility with which the procedure can be implemented into an existing code. We examine here the proposed method under all these aspects.
An erratum to this chapter is available at http://dx.doi.org/10.1007/978-3-7091-2967-8_18
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© 1987 Springer-Verlag Wien
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Raous, M., Latil, J.C. (1987). Codes D’elements Finis Pour des Problemes de Contacts Unilateraux Avec Frottement Formules in Termes D’inequations Variationnelles. In: Del Piero, G., Maceri, F. (eds) Unilateral Problems in Structural Analysis — 2. International Centre for Mechanical Sciences, vol 304. Springer, Vienna. https://doi.org/10.1007/978-3-7091-2967-8_14
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DOI: https://doi.org/10.1007/978-3-7091-2967-8_14
Publisher Name: Springer, Vienna
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