| 郑海超,朱新杰,高广健,邓明晰.焊接薄板中S0兰姆波对槽型缺陷响应特性的数值研究*[J].,2018,37(1):136-144 |
| 焊接薄板中S0兰姆波对槽型缺陷响应特性的数值研究* |
| Numerical study on response characteristics of S0 Lamb waves to groove defects in welded thin plates |
| 投稿时间：2017-10-31 修订日期：2017-12-25 |
| 中文摘要: |
| 采用数值仿真方法,就焊接薄板中S0兰姆波对槽型缺陷的响应特性及焊缝对S0兰姆波槽型缺陷检测灵敏度的影响开展了数值研究。数值仿真结果表明,S0_R信号(经槽型缺陷反射的S0兰姆波回波信号)的反射比率随槽型缺陷深度的增大而单调增加；S0_R信号的反射比率随槽型缺陷宽度的变化呈非单调变化关系,可将S0_R信号的反射比率及其持续时间一并加以考虑,以评价槽型缺陷宽度的变化。随着焊缝余高的增加,S0兰姆波对槽型缺陷的检测灵敏度将降低；随着焊缝宽度的增加,S0兰姆波对槽型缺陷检测灵敏度的影响并不明显；相比之下,焊缝余高是影响S0兰姆波槽型缺陷检测灵敏度的主要因素。研究结果表明,将S0兰姆波用于检测隐藏于焊缝背后的槽型缺陷,是具有可行性的。本文所得结果对于发展焊接薄板的超声兰姆波无损检测技术,具有理论指导意义和实际参考价值。 |
| 英文摘要: |
| The response characteristics of the S0 Lamb wave propagation to the groove defects, as well as the influences of the weld joint on the detection sensitivity of the S0 Lamb wave to the groove defects, have been investigated using numerical simulations. The simulation results show that the reflection ratio of the S0_R signal (i.e. the echo signal of the S0 Lamb wave reflected by the groove defect) monotonously increases with increase in the depth of the groove defects. However, the change trend of the reflection ratio of the S0_R signal is no longer monotonic with change in the width of the groove defects. It is proposed that the width of the groove defects can be evaluated via simultaneously considering both the reflected ratio of the S0_R signal and its duration. It is found that the detection sensitivity of the S0 Lamb wave to the groove defects decreases with increase in the weld reinforcements. In contrast, the detection sensitivity of the S0 Lamb wave to the groove defects is |
| DOI：10.11684/j.issn.1000-310X.2018.01.020 |
| 中文关键词: 焊接薄板,槽型缺陷,S0兰姆波,响应特性 |
| 英文关键词: Welded thin plate, Groove defect, S0 Lamb wave, Response characteristic |
| 基金项目:国家自然科学基金项目 (11474361, 11704410, 11574399) |
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| 摘要点击次数: 1893 |
| 全文下载次数: 1835 |
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