Abstract
Multilayer structures are frequently used for military impact protection applications. For low-velocity impacts, they can be made from a wide variety of materials, including metallic and polymeric materials. One proposes to investigate the impact resistance of two-layer structures composed of polydicyclopentadiene thermosetting resin (P-DCPD) combined with DP450 steel or AA2024-T3 aluminum. Structures are subjected to debris impacts of 125 J at 10 m/s. Polymer stacking order is evaluated, highlighting the importance of P-DCPD to be the first layer impacted. To understand and validate these experimental results, the behaviors of DP450, AA2024-T3 and P-DCPD are studied. Experimental tests (quasi-static tension and compression, dynamic compression and Iosipescu shear tests) are carried out to characterize P-DCPD and validate material behavior laws. Finite element simulations using LS-Dyna software are used to validate and explain experimental impact results.
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