The modelling of damage and fracture behaviour under high rates of loadings for metallicudstructures presents the more and more interests for engineering design, especially for crash phenomena.udIn order to perform a numerical simulation of such phenomena a crack propagation criterion must beudidentified using adapted laboratory tests. The objective of this paper is to present a new impact test intendedudfor the identification of a cohesive crack criterion implemented into a home-made FEM code based onudExtended Finite ElementMethod. Therefore, a double-notched specimen is impacted using a gas-gun deviceudin order to obtain different crack paths depending on projectile speed. A post-impact macro-photographicudobservation allows to measure the crack path, the angles and the advancing length. These experimentaludresults are used as input responses in the identification procedure for determining the crack cohesiveudcriterion parameters. Some experimental results, for an aluminium alloy crack criterion identification, areudpresented to illustrate the proposed approach.
展开▼
