Intelligent Nondestructive Evaluation of Composite Materials Using PatternRecognition

摘要

A promising ultrasonic non-destructive evaluation (NDE) technique for thecharacterization of the interphase is given for a single fiber composite. The formal solution to the formulated problem is found via the normal mode expansion method. A computer program is developed for the calculation of the formal solution and its validity is confirmed by two methods: limited case analysis and energy balance analysis. In an attempt to solve the inverse problem of assessing the input parameters from the output parameters, one or more of the input parameters (interphase properties) are assumed to be known as their respective nominal values. For such simplified cases, a graphical technique for solving the inverse problem is developed and demonstrated. Finally, the interphase thickness parameter is shown to be predicted through linear and non-linear multiple regression with high accuracy.