V型切口板材试件拉伸断裂过程中的声发射特征
AE Feature Analysis on Tensile Fracture for Plate Specimens with Pre-Cracked V Cut
摘 要
制作了直V型切口和斜V型切口板材试件，设计了板材拉伸断裂声发射监测试验。结合金属断裂力学性能和红外热图，分别对两种切口板材主要声发射参数与断裂过程的相关性进行深入分析，研究试件损伤过程的声发射参数表征以及某些参数特征。结果表明，声发射能量计数、振铃计数、撞击、幅度和频谱峰值能较好地表征试件损伤过程。证明了声发射技术应用于钢制结构损伤实时监测和预警的可行性，并得出某些声发射参数的重要特征。
V型切口
实时监测
拉伸断裂
损伤过程
Acoustic emission testing
V cut
Real-time monitoring
Tensile fracture
Damage process
Abstract
The plate specimens with V cut pre-cracked were fabricated and the test using acoustic emission(AE) to monitor the process of tensile fracture of plate specimens was designed. Associated with fracture mechanical behavior during tensile and some IR images, the correlations of some AE parameters with fracture process of the two kinds of specimens were deeply analyzed, the AE feature during tensile fracture and its description of damage process was studied. The results showed that the AE energy, hits, counts, amplitude, peak value of frequency contents and so on. during tensile fracture for plate specimens could describe the corresponding damage process. This further proved the feasibility of AE monitoring and early warning application on steel structures, and some conclusions about AE parameters were gained.
中图分类号 TB52 TG115.28
所属栏目 试验研究
基金项目 国家高技术研究发展计划(863计划)专项经费资助项目(2006AA09Z355)
收稿日期 2008/6/24
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备注刘立群(1980-)，女，硕士研究生，主要从事海洋油气设备腐蚀、泄露等安全检测技术方面的研究工作。
引用该论文: LIU Li-Qun,CHEN Guo-Ming,XU Chang-Hang. AE Feature Analysis on Tensile Fracture for Plate Specimens with Pre-Cracked V Cut[J]. Nondestructive Testing, 2009, 31(5): 360～363
刘立群,陈国明,徐长航. V型切口板材试件拉伸断裂过程中的声发射特征[J]. 无损检测, 2009, 31(5): 360～363
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参考文献
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【3】Ennaceur C, Laksimi A, Herve C, et al. Monitoring crack growth in pressure vessel steels by the acoustic emission technique and the method of potential difference[J]. Pressure Vessels and piping,2006,83(3):197-204.
【4】Vibhor Chaswal, Sasikala G, Ray S K, et al. Fatigue crack growth mechanism in aged 9Cr-1Mo steel: threshold and Paris regimes[J]. Materials Science and Engineering,2005,395(1-2):251-264.
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