Scattering from Partially Closed Cracks and other Imperfect Interfaces

部分闭合裂纹和其他不完美界面的散射

• 批准号: 9114547
• 负责人: John Harris
• 金额: $ 21.03万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-09-01 至 1995-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9114547&HistoricalAwards=false
• 关键词: Scattering; Partially; Closed; Cracks; other

The objective of this research is to study how ultrasonic waves scatter from partially closed cracks and other imperfect interfaces. An important part of this research is developing a model for such interfaces that takes account of surfaces roughness and the partial contact between crack or bond faces. An equally important part is developing a model of the measurement process that accounts for the transmitting and receiving characteristics of the transducers. The results of this research will enable more complete, quantitative information about such cracks and interfaces to be extracted from scattered ultrasonic signals. Examples of such quantitative information include the size of a fatigue crack and an estimate of the strength of a diffusion bond. Such information enables one to assess quantitatively the quality and reliability of manufactured parts. The approach used is interactive. It involves a combination of analytical and numerical approaches whose outcomes will be continuously compared. Moreover, the predictions from these calculations will be continuously compared with existing data from measurements carried out at the Center for Nondestructive Evaluation at Iowa State University.

本研究的目的是研究超声波如何从部分闭合的裂纹和其他不完美的界面散射。这项研究的一个重要部分是为这种界面开发一个模型，该模型考虑了表面粗糙度和裂纹或粘合面之间的部分接触。一个同样重要的部分是建立一个测量过程的模型，该模型考虑了传感器的发射和接收特性。本研究结果将使我们能够从散射的超声信号中提取更完整、定量的裂缝和界面信息。这种定量信息的例子包括疲劳裂纹的尺寸和扩散键强度的估计。这些信息使人们能够定量地评估制造零件的质量和可靠性。所使用的方法是交互式的。它涉及分析和数值方法的结合，其结果将不断进行比较。此外，这些计算的预测结果将不断与爱荷华州立大学无损评估中心的现有测量数据进行比较。