Modelling factors of square tubes in high speed bending situations
Collins, Paul K., Mullins, Jonathan G., Rolfe, Bernard and Hodgson, Peter 2007, Modelling factors of square tubes in high speed bending situations, in SAE 2007 World Congress, SAE International, Warrendale, Pa., pp. 1-6.
Accurate finite element crash simulations of side impact depend upon a thorough understanding of dynamic tube bending. There is a need to understand the dynamic bending mode of square sections (equivalent of automotive structural parts) to obtain a greater confidence in CAE. This work varied strain rate and material definitions, such as Cowper-Symonds vs Zerilli-Armstrong, as well as initial velocity and yield strength. The results show that most of the plastic work is done between strains rates of 30 ¿ 300/s and strains up to 0.3. Peak strain rates were marginally above 1000/s with maximum strain greater than 1. When the strain rate definition and material model were modified, it was shown that a higher yield stress produced a higher reaction force. These results would suggest that the strain rate sensitivity needs to be carefully identified for accurate crash simulations.
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