A novel impact approach based on electromagnetic loading technology: A case study on CFRP/Al riveted structures

IF 4.7 2区 工程技术 Q1 MECHANICS
Minghao Zhang , Zengqiang Cao , Xinglong Gong , Qi Hu , Mengchen Yu , Lubin Huo
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Abstract

To investigate the mechanical response and damage behavior of aircraft fuselage composite structures under out-of-plane impact loads more efficiently and flexibility, this paper proposed a novel impact approach and testing platform based on inductive coils to yield electromagnetic impact force. The influence of system key parameters on the electromagnetic loading waveforms were analyzed using an electromagnetic field finite element model. Single/repeated impact tests on CFRP/aluminium alloy (Al) riveted structures were conducted at different voltages (energies) based on this approach. The results indicate that the electromagnetic impact (EMI) approach exhibits significant advantages in both variable strain rate loading and continuous impact loading scenarios. This device can efficiently achieve multi-point and multiple impact loading. The electromagnetic impact forces with various amplitudes and pulse-widths can be accurately obtained by altering voltage and capacitance values, which can demonstrate the good experimental consistency of such test approach. Besides, with this test method, the load threshold for damage formation can be clearly defined: once the impact force exceeds the damage threshold load, the delamination area of the CFRP laminates expand as the impact energy increases. Note that when the provided out-of-plane impact load is slightly higher than the damage threshold load by changing the voltage, significant delamination damage may suddenly manifest in any one impact event of the repeated impacts.

Abstract Image

基于电磁加载技术的新型冲击方法:CFRP/Al 铆接结构案例研究
为了更有效、更灵活地研究飞机机身复合材料结构在平面外冲击载荷下的力学响应和损伤行为,本文提出了一种基于感应线圈产生电磁冲击力的新型冲击方法和测试平台。利用电磁场有限元模型分析了系统关键参数对电磁加载波形的影响。基于这种方法,在不同电压(能量)下对 CFRP/铝合金(Al)铆接结构进行了单次/重复冲击试验。结果表明,电磁冲击(EMI)方法在可变应变速率加载和连续冲击加载情况下都具有显著优势。该装置可有效实现多点和多重冲击加载。通过改变电压和电容值,可精确获得不同振幅和脉宽的电磁冲击力,这表明这种测试方法具有良好的实验一致性。此外,通过这种测试方法,还可以明确界定损伤形成的载荷阈值:一旦冲击力超过损伤阈值载荷,CFRP 层压板的分层面积就会随着冲击能量的增加而扩大。需要注意的是,当通过改变电压使提供的平面外冲击载荷略高于破坏阈值载荷时,在重复冲击的任何一次冲击事件中都可能突然出现明显的分层破坏。
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来源期刊
CiteScore
8.70
自引率
13.00%
发文量
606
审稿时长
74 days
期刊介绍: EFM covers a broad range of topics in fracture mechanics to be of interest and use to both researchers and practitioners. Contributions are welcome which address the fracture behavior of conventional engineering material systems as well as newly emerging material systems. Contributions on developments in the areas of mechanics and materials science strongly related to fracture mechanics are also welcome. Papers on fatigue are welcome if they treat the fatigue process using the methods of fracture mechanics.
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