期刊论文

Propagation characteristics of acoustic emission signals affected by the length and the position of cracks

Wang, Xianghong(wangxianghong2000@126.com)

中文

仪器仪表学报

0254-3087

2015

36

12

2867-2873

10.3969/j.issn.0254-3087.2015.12.029

51105045:国家自然科学基金 51205031:国家自然科学基金 51365006:国家自然科学基金 15A008:湖南省教育厅重点项目 CX2015SS04:长沙理工大学研究生科研创新项目 2015NGQ006:长沙理工大学能源高效清洁利用湖南省高校重点实验室基金项目

本校为第一且通讯机构

针对再制造毛坯闭合裂纹检测较困难,采用声发射技术,从仿真和实验两个方面研究裂纹长度和裂纹位置对声发射信号传播特性的影响。根据裂纹中波的传输理论,采用时域有限差方法,仿真两个因素对声信号的影响,实验结果表明,裂纹长度对于信号衰减影响比裂纹位置明显; 裂纹长度小于3 mm时信号的能量和幅值衰减系数(分别为- 0.28和- 0.15)明显大于裂纹长度大于6 mM的信号衰减系数(分别为- 1.48和- 0.9); 裂纹长度为3 mm比裂纹长度为0.5 mm时能量和幅值相对衰减率分别大0.62 dB和0.2 dB,而其比裂纹长度为15 mM的能量和幅值相对衰减分别小14.7 dB和8 dB; 裂纹位置的能量相对衰减率位于- 6.4 ~ - 6.6 dB,幅...

To address problem that closed crack detection of remanufacturing blank is more difficult, the acoustic emission technology is used to study propagation characteristics of acoustic emission signals due to the length and the position of cracks in remanufacturing blanks. The wave transmission theory in crack medium and the finite difference time domain method are used to simulate the influence of two factors on acoustic signals which indicates that the attenuation effect due to crack lengths is more obvious than that due to crack locations. The energy and amplitude attenuation coefficients (0.28...