作者：孙贺¹, 李伟², 张璐莹², 蒋鹏²

作者单位：1. 中国石油化工股份有限公司镇海炼化分公司，浙江 宁波 315000;
2. 东北石油大学机械科学与工程学院，黑龙江 大庆 163318

关键词：碳纤维复合材料;声发射;连续小波变换;模态识别;预触发能量

摘要：

针对碳纤维复合材料失效机理复杂，声发射信号量大，结构健康状态监测困难的问题，提出一种碳纤维复合材料在线监测损伤预测方法。首先，分析铝板中不同位置的典型声发射信号，获得一种声发射信号模态识别方法。在纤维束、树脂单一损伤实验中获得纤维束断裂、树脂开裂声发射信号的模态特征。设计T700碳纤维复合材料层合结构拉伸实验，定义预触发能量E来表征不同载荷条件下碳纤维复合材料由纤维断裂损伤引起的微振动情况。结果表明，纤维束断裂与树脂开裂声发射信号包含不同模态频率成分，且模态成分差异明显。随着损伤的积累，较高频率成分信号的预触发能量E开始波动，这对复合材料层合结构失效有预警作用，为结构健康状态在线监测研究提供参考。

Research on damage of carbon fiber composites based on modal acoustic emission
SUN He¹, LI Wei², ZHANG Luying², JIANG Peng²
1. Sinopec Zhenhai Refining & Chemical Company, Ningbo 315000, China;
2. School of Mechanical Science and Engineering, Northeast Petroleum University, Daqing 163318, China
Abstract: Problems for carbon fiber composite material failure mechanism is very complex, large acoustic emission signal, structural health monitoring difficulties, proposed prediction method for online monitoring damage a carbon fiber composite material. First, analyze the typical acoustic emission signals at different positions in the aluminum plate, and obtain an acoustic emission signal modal recognition method. Then, the modal characteristics of the fiber bundle fracture and resin crack acoustic emission signal are obtained by the experiment which only fiber bundle and only resin damage. Finally, carry out tensile test of T700 carbon fiber composite laminate structure, investigate the effect of structural micro vibration caused by fiber fracture damage on the pre-trigger waveform energy E. The result shows, the acoustic emission signals of fiber bundle fracture and resin cracking contain different modal frequency components, and there are significantly different between modal frequency components. With the accumulation of damage, the pre-trigger energy E of the high-frequency signal begins to fluctuate, which has an early warning effect on the failure of the composite laminate structure and is meaningful for the online monitoring of the structural health status.
Keywords: carbon fiber composite;acoustic emission;continuous wavelet transform;modal identification;pre-trigger energy
2021, 47(5):16-23  收稿日期: 2020-10-11;收到修改稿日期: 2020-11-18
基金项目: 国家重点研发计划(2017YFC0805600)
作者简介: 孙贺(1994-),男,黑龙江鹤岗市人,硕士,主要从事现代无损检测技术研究
参考文献
[1] 钟云娇, 边文凤. 高模碳纤维细观力学分析[J]. 复合材料学报, 2017, 34(3): 668-674
[2] SEBAEY T A, GONZALEZ E V. Damage resistance and damage tolerance of dispersed CFRP laminates: the bending stiffness effect[J]. Composite Structures, 2013, 106: 30-32
[3] 李伟, 姜智通, 张璐莹, 等. 碳纤维复合材料损伤声发射信号模式识别方法[J]. 中国测试, 2020, 46(6): 121-128
[4] 张维刚, 李凯丽, 肉孜麦麦提, 等. 金属薄板中导波的模态识别和波速测定[J]. 声学技术, 2015, 34(4): 322-326
[5] 张志强, 张国胜, 刘艳芳, 等. 断铅试验声发射信号处理与损伤源定位研究[J]. 中国测试, 2015, 41(8): 17-21
[6] 李帅永, 王鹏飞, 严冬, 等. 气体管道泄漏模态声发射时频定位方法[J]. 仪器仪表学报, 2016, 37(9): 2068-2075
[7] 王少锋, 刘朋真, 王道瑞, 等. 基于morlet小波与模态分析的突发型声发射源定位研究[J]. 传感技术学报, 2017, 30(8): 1215-1219
[8] JALAL Y, MEHDI A N, HOSSEIN H T, et al. Damage evaluation of laminated composite material using a new acoustic emission lamb-based and finite element techniques[J]. Applied Composite Materials, 2018, 25(5): 1021-1040
[9] PURI N H, ENRIQUE V, TURKAN Y, et al. Assessment of compliance of dimensional tolerances in concrete slabs using TLS data and the 2D continuous wavelet transform[J]. Automation in Construction, 2018, 94(10): 62-72
[10] 付文成, 刘懿莹, 王霖洁, 等. 基于微纳耦合光纤传感器的模态声发射源线性定位研究[J]. 振动与冲击, 2019, 38(1): 79-88
[11] 魏建林, 周阳, 杨晓辉, 等. 一种改进模态声发射源线性定位方法[J]. 中国测试, 2020, 46(11): 10-15
[12] GORDON J, ILJA K, MARTIN B, et al. Influence of reversed fatigue loading on damage evolution of cross-ply carbon fibre composites[J]. Materials, 2019, 12(7): 1153
[13] ZHANG W G, DAI M Z. Recognition of corrosion severity using modal acoustic emission on a thin plate[J]. Russian Journal of Nondestructive Testing, 2018, 54(12): 831-839
[14] 李宏坤, 刘洪轶, 徐福健, 等. 连续小波最优重构尺度确定方法与故障早期识别[J]. 机械工程学报, 2014, 50(17): 69-76
[15] ABHISHEK S, ANSHU M. The continuous wavelet transform on ultradistribution spaces[J]. Colloquium Mathematicum, 2019, 157: 189-201