Abstract
A methodology to enforce a given structural dynamic behavior during an impact while accounting for uncertainty is presented. The approach is based on locating structural fuses that weaken the structure locally and help enforce a deformation mode. The problem of enforcing the crushing of a tube impacting a rigid wall is chosen. In order to find the positions of the fuses, the method identifies distinct structural dynamic behaviors using designs of experiments and clustering techniques. The changes in behavior are studied with respect to variations of the fuse positions and random parameters, such as the thickness. Based on the probabilistic distributions, a measure of the likelihood of occurrence of global buckling is defined. The positions of the fuses are defined using an optimization problem in terms of the likelihood of global buckling and the amount of absorbed energy in the tube. A first formulation of the problem considers variability in the tube’s thickness only. A second formulation also accounts for uncertainties in the positions of the fuses.
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Missoum, S. Controlling structural failure modes during an impact in the presence of uncertainties. Struct Multidisc Optim 34, 463–472 (2007). https://doi.org/10.1007/s00158-007-0100-z
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DOI: https://doi.org/10.1007/s00158-007-0100-z