Abstract
The response of Fibre metal laminates (FMLs) to low-speed impact, including displacement at impact center, stress, strain response, and metal and fiber damage during the process was studied. Three types of stainless steel based FMLs with carbon fibre reinforced plastic (CFRP) specimens with different interface connections were designed and low-speed impact tests were carried out on these specimens. At the same time, finite element software ABAQUs is also used to simulate the impact process. During this process, we employ a cohesive element to characterize the bonding relationship of the interface, moreover, the influence of interface connection strength on impact resistance performance of FMLS is emphatically studied. The results show that the mechanical response and damage state of FMLS under different interface connection modes are greatly different, and the higher the connection strength, the better the overall impact resistance of the specimen. When the connection strength is poor, the specimen is easy to be separated when subjected to impact, and the metal layer suffers early damage failure, which is not ideal for the whole structure.
Highlights
Fibre metal laminates (FMLs) are a novel material structure originally developed for aeronautical engineering applications with high fatigue tolerance [1]
The processing of interface connection relation of FMLS is the key to study its interface debonding, TP et al used Cohesive element to characterize the connection relationship of FMLS during low-speed impact simulation, the results show that this method can simulate the bonding and debonding process of interface [3]
In order to further reveal the mechanical response of FMLS under low-speed impact, FMLS specimens with different interface connection modes were designed in this paper, and low-speed impact tests were conducted on these specimens
Summary
Fibre metal laminates (FMLs) are a novel material structure originally developed for aeronautical engineering applications with high fatigue tolerance [1]. Metal plastic deformation and fiber breakage is one of the most important failure mode of FMLS. Scholars have conducted a large number of studies on the damage evolution process of FMLS, but has not yet formed a mature theory. The mechanical response of the structure and the law of damage evolution are far from enough in the process of laminates being impacted [2]. In order to further reveal the mechanical response of FMLS under low-speed impact, FMLS specimens with different interface connection modes were designed in this paper, and low-speed impact tests were conducted on these specimens
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