Finite element simulation of the simple tension test in metals

In this work the finite element simulation of the simple tension test in metals is discussed. Results from Bridgman as well as experimental measurements obtained with aluminium specimens are compared with numerical simulations. The computational analyses carried out consider several finite element technologies as the Q1/P0 mixed formulation, and various enhanced assumed strain formulations from Simo and coworkers. The constitutive model considered includes large strain plasticity effects via the multiplicative decomposition of deformation gradient tensor. A key objective of this work is to perform a detailed discussion for strain and stress distribution at necking zone. The simulations performed show good agreement with the analytical and experimental results. Analytical results due to Bridgman are confirmed by the computational simulations. This test can be considered as an adequate benchmark in order to calibrate large strain plasticity finite element codes.

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