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工程力学  2014 

基于应变信号的复合材料层合板低速冲击损伤识别研究

DOI: 10.6052/j.issn.1000-4750.2012.09.0693, PP. 230-236

Keywords: 复合材料层合板,冲击损伤,损伤识别,损伤指标,冲击总时间

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Abstract:

为了进行复合材料层合板的冲击损伤识别研究,设计了由小到大的14个等级的冲击能量,对应由小到大的冲击损伤,其中最小能量的冲击没有造成损伤,最大能量的冲击造成穿透复合材料板的损伤。应用冲击过程中测试得到的应变响应进行损伤识别。基于冲击过程中获得的脉冲应变信号,提出了10个新的冲击损伤识别指标:脉冲上升时间、下降时间、总时间、上升时间比下降时间、下降时间比上升时间;脉冲上升面积、下降面积、总面积、上升面积与下降面积之比、下降面积与上升面积之比。将提出的10个新冲击损伤识别指标与冲击能量的关系进行了对比研究。研究表明:脉冲下降时间、脉冲总时间、脉冲下降面积、脉冲总面积与冲击能量之间的关系大体上都是单调的,这4个指标适合0.8J/mm到6.67J/mm的大范围的冲击损伤程度识别,其余6个指标在一定的冲击能量范围内可以识别冲击损伤程度。应用脉冲下降面积、脉冲总面积指标进行了冲击定位识别研究,研究表明,这两个指标也可以识别冲击损伤的位置。

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