Technical Report on the Status of Nonlinear Ultrasonic Techniques for Non-Destructive Inspection

Abstract

This report summarizes technical work conducted by LANL staff and international collaborators in support of the UFD Storage Experimentation effort. The overall focus of this technical work is twofold: a) on the detection and imaging of a failure mechanism known as stress corrosion cracking (SCC) in stainless steel, and b) on evaluating concrete degradation using nonlinear ultrasonic techniques. This year we report here on three research efforts: 1) experimental effort utilizing TREND and SPACE inspection techniques for crack detection in stainless steel; 2) numerical modeling of 3D time reversal focusing to quantify TREND inspection regions; and 3) application of nonlinear ultrasonic techniques for quantifying concrete degradation. The first and third were collaborative efforts. The first was performed in conjunction with the