...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Aerospace science and technology >The crack detection and evaluation by elastic wave propagation in open hole structures for aerospace application
【24h】

The crack detection and evaluation by elastic wave propagation in open hole structures for aerospace application

机译：弹性波在航空用裸眼结构中的裂纹检测与评估

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The rectangular plate made of aluminum alloy with a relatively large circular hole in the geometrical center of the structure is subjected to uniform tension. This loading causes that in the vicinity of a hole a process of crack formation is triggered. The crack is detected and evaluated with the use of elastic wave propagation method. The piezoelectric activator is located directly on the edge of the hole and the rest of sensors are placed at an equal distance from the activator. The crack is detected by comparison of the reference, obtained for the intact plate, and the actual signal (pitch-catch measurement). The appropriate damage magnitude measurement is proposed. Moreover, the system, which works without knowledge of an intact structure, is also discussed. In order to estimate and visualize the length of a crack, the advanced diagnostic imaging is introduced. The applied method is based on a visualization of sensing paths with an assigned value of correlation coefficients, computed for reference and actual signals. The effectiveness of the described system is verified with the use of numerical simulation and experimental test. The theoretical analysis is carried out with the use of the finite element method. The computations are performed for several assumed lengths of cracks. The obtained theoretical results, as well as the experimental analysis, confirm the fact that the crack can be detected at an early stage of formation. Moreover, a relatively good agreement between the real crack lengths and the ones obtained with the use of the proposed method is observed in the numerical analysis as well as in the experiment. (C) 2018 Elsevier Masson SAS. All rights reserved.
机译：由铝合金制成的矩形板在结构的几何中心具有较大的圆形孔，该矩形板受到均匀的张力。该载荷导致在孔附近触发裂纹形成过程。使用弹性波传播方法检测和评估裂纹。压电激励器直接位于孔的边缘，其余传感器与激励器的距离相等。通过比较从完整板获得的参考值和实际信号（音高测量）来检测裂纹。提出了适当的破坏幅度测量。此外，还讨论了在不了解完整结构的情况下工作的系统。为了估计和可视化裂缝的长度，引入了高级诊断成像。所应用的方法基于具有相关系数分配值的感测路径的可视化，针对参考信号和实际信号进行计算。通过数值模拟和实验测试验证了所描述系统的有效性。理论分析是使用有限元方法进行的。对几个假定的裂纹长度进行计算。所获得的理论结果以及实验分析证实了可以在形成的早期阶段检测到裂纹的事实。此外，在数值分析和实验中都观察到了实际裂纹长度与使用所提出的方法获得的裂纹之间的相对较好的一致性。 （C）2018 Elsevier Masson SAS。版权所有。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号