Theoretical and Experimental Study of Diffraction of ElasticWaves in Thick Plates

厚板中弹性波衍射的理论与实验研究

• 批准号: 8609813
• 负责人: Subhendu Datta
• 金额: $ 21.68万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1986
• 资助国家: 美国
• 起止时间: 1986-09-01 至 1989-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8609813&HistoricalAwards=false
• 关键词: Theoretical; Experimental; Study; Diffraction; ElasticWaves

This research performs a combined theoretical and experimental study of diffraction of Lamb waves by two- and three-dimensional cracks in a plate. The results will provide the basis to develop techniques for assessing the internal damage and cracks in solids. The theoretical study will use a hybrid finite element and modal expansion method. Cracks in a homogeneous as well as in a welded plate will be considered. A newly developed capacitive transducer will be used to measure vertical surface displacements in a plate. The measured displacements will be compared with the theoretical predictions. The goal of this investigation is to analyze the dependence of the scattered signals on the dimension, angle of inclination, and depth of burial of the crack. The detailed analysis will be used to identify characteristic features for crack sizing and location.

本研究采用理论与实验相结合的方法， 二维和三维裂纹对Lamb波的衍射 板 这些结果将为开发用于以下方面的技术提供基础： 评估固体的内部损伤和裂纹。 理论 研究将使用混合有限元和模态展开法。 均质板和焊接板中的裂纹将 考虑了 一种新开发的电容式传感器将用于 测量板中的垂直表面位移。 所测量的 位移将与理论预测进行比较。 的 本研究的目的是分析 散射信号的尺寸，倾斜角度，和深度 裂缝的埋藏 详细的分析将用于识别 裂纹尺寸和位置的特征。