FEM on the example of a tension test of a flat bar with five holes in the range of large elastoplastic deformations. The ARAMIS optical image correlation system was used in the experimental studies. As a result of the conducted analyses and comparisons, it was found that in the case of isotropic materials, the elastoplastic material model with non-linear isotropic hardening and the Huber-Mises yield criterion implemented within the framework of the large plastic deformation theory is useful for predicting the nature of failure of metal structural elements.
It should be emphasized that the same model implemented in the small displacement theory does not allow for correct qualitative and quantitative predictions.
AN ATTEMPT TO VERIFY THE CONSTITUTIVE RELATIONSHIPS FOR ELASTIC-PLASTIC MATERIALS IN THE FLAT BAR TENSION TEST USING OPTICAL IMAGE CORRELATION SYSTEM
The paper presents results of experimental verification of numerical FEM simulations on the example of flat bar with five holes in stretching test for the large deformation elastoplasticity theory. In experimental studies an ARAMIS image correlation optical system have been used. As a result of experimental analysis and comparisons with FEM solutions it was found that in the case of isotropic materials the constitutive model of elasto-plasticity with
Huber-Mises yield condition and non-linear isotropic hardening implemented in ABAQUS software for relatively large deformation can be used to predict the sample behavior in the wide range of deformations. It is worth emphasizing that the same model implemented in the small displacement theory does not allow for accurate qualitative and quantitative predictions. (…)
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Source: Logistyka Magazine