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在IV型聚合物层压力容器的碳/环氧覆盖件中,基于模态分析检测几乎看不到的冲击损伤

Mirosław Bocian¹, Mikołaj Kazimierczak¹, Barbara Kmiecik¹

¹Department of Mechanics, Materials and Biomedical Engineering, Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, Smoluchowskiego 25, 50-372 Wroclaw, Poland.

|November 27, 2025

概括

本研究提出了一种基于振动的方法,用于检测复合材料覆盖压力容器 (COPV) 中几乎看不到的冲击损伤 (BVID). 该技术使用模态分析来识别刚性损失,使得快速的,非压缩的现场评估.

科学领域:

材料科学材料科学材料科学
机械工程机械工程
非破坏性测试不破坏性测试

背景情况:

复合材料覆盖压力容器 (COPV) 在航空航天和能源储存方面至关重要.
几乎看不见的撞击损伤 (BVID) 由于潜在的灾难性故障,造成了重大安全风险.
目前COPV中BVID的检查方法往往耗时,需要专门的设备.

研究的目的:

开发和验证一种基于振动的协议,用于在IV型COPV中检测BVID.
建立预测签名,以便对受影响的COPV进行快速,非压缩的现场评估.
调查传统的模式保证标准 (MAC) 在识别微妙的结构不对称性方面的局限性.

主要方法:

给加压的COPV施加1kJ冲击,然后压缩.
使用168点网格进行了免费无试验模式分析.
更新了有限元模型,通过降低局部子体内的正极管刚性来模拟损伤.
使用辐射位移扫描线来分析模式形状和定位损伤.

主要成果:

频率响应函数 (FRF) 在撞击点显示出明显的峰值和较低的连贯性,表明局部刚性损失.
更新的有限元模型准确地预测了模态频率 (误差<2%),并显示由于不对称性而导致特定模态对的对角 MAC 值 (0.49-0.88) 降低.
射线位移扫描显示了局部的振幅凸起和模式的变化交叉撞击地点,提供空间分辨率.
结合的方法将冲击局部化到正确的周长区域,分辨率为厘米尺度.

结论:

基于振动的模态分析,包括FRF不对称性,MAC选和扫描线分析,有效地检测和定位COPV中的BVID.
该协议为受影响的COPV提供了一个快速的,非压缩的,现场评估方法.
单纯的经典MAC对于早期缺陷检测是不够的;补充空间分析至关重要.

关键词:

复合材料是一种复合材料.检测损坏检测损坏的检测.有限元素方法的有限元素方法.高压容器的高压容器模式分析模式分析对振动进行分析.

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