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Investigation on impact behavior of FMLs under multiple impacts with the same total energy: Experimental characterization and numerical simulation

机译：总能量相同的多重冲击下FML的冲击行为研究：实验表征和数值模拟

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摘要

This paper aims to investigate the low-velocity impact behavior of fiber metal laminates (FMLs) consisting of carbon fiber-reinforced layers and aluminum sheets under multiple impacts with the same total energy. Experimental and numerical methods are implemented to explore the influence of impact energy division, load sequence and metal layer distribution on multiple impact behavior and damage morphologies of FMLs. A series of repeated drop impact tests with different impact energy combinations are implemented on FMLs. Subsequently, an integrated numerical model based on multiple consecutive steps is established to characterize the damage accumulation and failure mechanisms of FMLs, in which a user defined subroutine VUMAT, is developed to consider the stiffness degradation and damage evolution of composite material. The numerical predictions show a good correlation with the corresponding experimental results. The results reveal that multiple impacts with lower energy division and smaller initial impact energy can cause minor damage in FMLs. Generally, the impact load, energy absorption, damage morphologies and the interfacial delamination are closely related to the magnitude, sequence and division of impact energy. In addition, the strain hardening of aluminum sheets after first impact can improve the stiffness of FMLs, and further strengthen the impact resistance significantly.
机译：本文旨在研究由碳纤维增强层和铝板组成的纤维金属层压板（FML）在多次冲击下具有相同的总能量时的低速冲击行为。通过实验和数值方法探讨了冲击能的分配，载荷顺序和金属层的分布对FMLs多种冲击行为和损伤形态的影响。在FML上执行了一系列具有不同冲击能量组合的重复跌落冲击试验。随后，建立了一个基于多个连续步骤的集成数值模型来表征FML的损伤累积和破坏机理，在该模型中，开发了用户定义的子例程VUMAT，以考虑复合材料的刚度下降和损伤演变。数值预测表明与相应的实验结果有很好的相关性。结果表明，具有较低能量分配和较小初始冲击能量的多次撞击会在FML中造成较小的损坏。通常，冲击载荷，能量吸收，损伤形态和界面分层与冲击能量的大小，顺序和划分密切相关。此外，首次冲击后的铝板应变硬化可以提高FML的刚度，并进一步显着增强抗冲击性。

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