Modelling for Ultrasonic Nondestructive Evaluation of Columnar Structures in Anisotropic Materials. Final Report

摘要

Finite element modelling is feasible for anisotropic and isotropic materials. A large computer and careful attention to selection of step size are important to achieving good results. The Houbolt algorithm is recommended in most cases. Extension into three dimensions is feasible, although this was not tested here. In three-dimensional problems the size of the solutions become very much larger. Solution of the inverse problem may, indeed, be possible with the finite element method. One approach would be to have a scheme of changing depth, size, and orientation of flaw through some type of iterative process. At first, such a process would require a great amount of human intervention; then with experience the process might be incorporated in a computer program. This method may well be the basis of future, automated ultrasonic inspection systems for welds and for other fabricated parts. (ERA citation 10:003036)