MODELING OF IMPACT ON MULTIPLE LAYERS WITH UNIDIRECTIONAL YARNS
Abstract
The objective of this paper is to simulate the behavior of unidirectional fabrics, as realistic as possible, in order to be able to use the model in designing impact-resistant packages. There was discussed the influence of the number of layer and the impact velocity on several characteristics as residual velocity of the projectile, its acceleration and the maximum values of von Mises stresses during the impact. Three cases were considered: one layer, two layers and four layers. For all cases, the impact velocity was varied between 100 m/s and 400 m/s, with an increment of 100 m/s, in order to simulate how the panel is damaged. The higher the impact velocity, the stressed area increases when the stress distribution is compared to the stress distribution obtained for v0=100 m/s to that for v0=300 m/s. At the highest velocity for which the simulation was run, the stressed area has diminished. For the four layer package, for lower velocities, the residual velocity has a lower percentage of the impact velocity, but at high speeds, for this package, the reduction of the residual is even lower (2.7% at v0=300 m/s and only 1.75% at v0=400 m/s).
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