13th International Conference on Fracture June 16–21, 2013, Beijing, China -1- Experimental and numerical investigation of fibre-metal laminates during low-velocity impact loading Yu E Ma1,* HaiWei Hu1 XiaoFeng Xiong2 QingMao Zhang2 1 School of Aeronautics, Northwestern Polytechnical University, 127, YouYi XiLu, Xi’An, P.R. China,710072 2 AVIC ChengDu Aircraft Design & Research Institute, ChengDu, P.R. China, 610041 * Corresponding author: ma.yu.e@nwpu.edu.cn Abstract Fibre-metal laminates(FMLs) that consists of three layers of 2024-T3 aluminium alloy sheets and two layers glass/epoxy composite were studied in this work. The specimens were designed and produced. Low-velocity impact tests were performed successfully on FMLs, using an instrumented falling weight machine. For comparison purposes, similar tests were set up and were carried out on monolithic 2024-T3 sheets. Damage mode and feature of them were compared and studied. ABAQUS software was used to simulate dynamic response and damage evolution of FMLs during impact. It is shown that FMLs have better impact resistance properties than pure aluminum sheets because of the fibre. The damage of FMLs has three clear different steps to damage during impact. The simulation and experiment results agree well with each other. Keywords Fibre-metal laminates(FMLs), low-velocity impact, damage mode 1. Introduction Fibre-metal laminates(FMLs) is a type of hybrid material which consists of alternating layers of thin metallic sheets bonded together with fiber reinforced layers[1-8]. During the last decades the application of FMLs in various structures has become increasingly popular, especially in aerospace structures, for its improved fatigue and impact properties [1-5]. There are many articles about experimental [1-3] and modeling [6,7] investigation, regarding to impact resistance of FMLs. While there are a limited number of articles concerning theoretical modeling of impact response of FMLs [8]. Despite of lots of work concerning the impact of FMLs have done, their impact properties still need more understanding and attention. In this study, low-velocity impact damage resistance of FMLs caused by dropped tools or collisions between service cargo (less than 10 m/s) in aircraft is investigated via both experimental and numerical simulations. 2. Experimental investigation The FMLs studied in this work were consists of three layers of 2024-T3 aluminium alloy sheets 0.254 mm in thickness and two layers of [0/90/90/0] glass/epoxy composite with each prepreg 0.15 mm in thickness. For comparison purposes, monolithic 2024-T3 sheets of 2 mm in thickness were also studied. According to standard ASTM-D-7136[9]，All specimens were cut into rectangle panels with dimensions of 150×100 mm2 . There are two types of FMLs specimens, type A with the rolling direction of aluminium sheet or 0 fibre direction parallel to the short side and type B parallel to the long side, and one type of aluminium specimens with rolling direction parallel to the short side. The low-velocity impact tests were conducted using an Instron-Dynatup 9250 instrumented drop-weight impact tester and used an impactor with a 16 mm diameter hemispherical steel head of a total
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