The Acousto-Ultrasonic Approach

This paper reviews the nature and underlying rationale of the acoustoultrasonic approach, suggests needed advanced signal analysis and evaluation methods, and discusses application potentials. The term acousto-ultrasonics denotes an NDE technique that combines some aspects of acoustic emission methodology with ultrasonic simulation of stress waves. The acousto-ultrasonic approach uses analysis of simulated stress waves for detecting and mapping variations of mechanical properties. Unlike most NDE, acousto-ultrasonics is less concerned with flaw detection than with the assessment of the collective effects of various flaws and material anomalies. Acousto-ultrasonics has been applied chiefly to laminated and filament-wound fiber reinforced composites. It has been used to assess the significant strength and toughness reducing effects that can be wrought by combinations of essentially minor flaws and diffuse flaw populations. Acousto-ultrasonics assesses integrated defect states and the resultant variations in properties such as tensile, shear, and flexural strengths and fracture resistance. Matrix cure state, porosity, fiber orientation, fiber volume fraction, fiber-matrix bonding, and interlaminar bond quality are factors that underline acousto-ultrasonic evaluations.

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