Acoustic NDE of Multilayered Composites. Phase II. Angle Beam Model Validation and Inspection of Bronze-Rubber Structures.

摘要

A model for the response of layered structures to off-normal ultrasonic pulses was validated by modifying the computer model developed under Phase 1 of this contract. For angle beams, the responses have different magnitude and phases, and include different modes of propagation, unlike the case for normal-incidence beams investigated under Phase 1. The model-simulated reflection series was compared with ultrasonic digital data collected from a bronze-epoxy-aluminum structure. The response from the different interfaces and for different transit paths were validated for their transit time, mode of propagation and relative magnitude and phase. Ultrasonic digital data were collected under flaw and no-flaw conditions. The data were processed and the flaw and no-flaw signals were clearly separable.