Modeling of Beam Plastic Hinge Mechanisms in Correlation with Analytical and Experimental Results
DOI:
https://doi.org/10.70567/mc.v42.ocsid8322Keywords:
Plastic hinge, beam finite elements, Kecman model, Reissner’s beam theory, AUTODYNAbstract
Plastic hinge in beams is a mechanism framed within the structural collapse of complex 3D lattice structures: car tubular chassis, buses, cranes, etc.; in this mechanism, the plasticity phenomenon (material nonlinearity) is mainly coupled with the local buckling phenomenon (structural nonlinearity). In this work, it is analyzed the extent to which the combination of these nonlinearities in finite element models is representative of the curves studied analytically and experimentally in the article "Bending collapse of rectangular and square Section Tubes" (Kecman, 1982) and Torsion (Trahair, 1997). The coupling is analyzed. The developed numerical models cover shell elements and beam element formulations, both implicit and explicit time integration schemes. The results show a high degree of correlation between the numerical models and the analytical-experimental results, which drastically reduces the need for physical testing. The work also extends the analysis to other types of nonsymmetric general sections, which are specific to the tubular structure of an electric vehicle. These tests show the limits of hybrid model technology (several types of elements combined), since it requires a load- discharge curve with hysteresis and does not allow for negative slopes, which are characteristic of the previously mentioned physical tests.
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