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Nonlinear Finite Element Simulation of Friction Stir Processing of Marine Grade 5083 Aluminum Alloy

Kishta E .E., Abed F. H., Darras B.

Engineering Transactions

2014

Vol. 62, iss. 4

313--328

As friction stir processing is emerging as a new technique for material enhancement, full understanding of the process has not been achieved yet. The resulting mechanical and microstructural properties are controlled by processing parameters like rotational and translational speeds. To support experimental results, it is very necessary to develop robust finite element models that can simulate the friction stir welding process and predict the effect of the processing parameters on the thermal profiles. This, in turn, gives a forecast of the expected tensile and microstructural properties of the alloy used. This paper presents a thermomechanicalbased finite element modeling adopting a coupled Eulerian Lagrangian formulation to simulate the friction stir process for Marine Grade AA5083. A set of friction stir welding tests considering different rotational and translational speeds is also conducted in this study to verify and validate the present FE modeling. The thermal profiles as well as the peak temperatures measured experimentally using infra-red imaging technique were successfully predicted by the proposed FE modeling.

Finite element formulations for 3D convex polyhedra in nonlinear continuum mechanics

Kraus M., Steinmann P.

Computer Assisted Methods in Engineering and Science

2012

Vol. 19, no. 2

121-134

In this paper, we present finite element formulations for general three-dimensional convex polyhedra for use in a common finite element framework that are well suited, e.g., for modeling complex granular materials and for mesh refinements. Based on an universally applicable interpolant for any convex polyhedron, different interpolation schemes are investigated in the context of nonlinear elastostatics. The modeling benefits and the numerical performance regarding the mechanical response and the computational cost are analyzed by several examples.