6533b7d8fe1ef96bd126b371

RESEARCH PRODUCT

Experimental and numerical study on composites laminates subjected to multi-impacts

subject

description

Composite carbon/epoxy materials are widely used in the industrial field as aeronautics and as land transport. These materials are often subjected to increasingly stringent conditions of use. They must withstand multiple impacts, the impact of objects such as hailstones, ballast, or even birds.In order to offer designers of composite structures relevant designing elements, we are interested in the first experimental time of the multi-impact tolerance of different stratifications (QIQH45, QIQH60, AERO) of different energies (10J, 15J, 20J). The study of these two parameters made it possible to define a hierarchy among the stratifications studied with the level of damage.The evaluation of the delaminated surfaces by ultrasonic method (C-Scan) showed that parameter D is particularly representative of the damage of impact and this whatever the number of impact imposed on the material.An incremental analysis of the ultrasonic control made it possible to highlight the morphology of the damage in the depth of the material by highlighting the importance of the stratification.In second step numerical approach by finite element was realized. This study has developed a numerical model of multi-impacts using LS-Dyna software. This numerical simulation successfully simulates the evolution of the damage during multi-impacts. The results of the simulation show a good correlation with those determined experimentally.