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New Guide for Flaw Detection using Nonlinear Resonance Ultrasound Inspection
1. Scope
This guide describes a general procedure and its variants, and a vocabulary, for detecting flaws in metallic and non-metallic parts using nonlinear resonance ultrasound inspection methods. The procedure is intended for use with instruments capable of exciting and recording whole-body resonance conditions within parts which exhibit acoustical or ultrasonic ringing. It is used to distinguish acceptable parts from those containing flaws such as cracks, delaminations, AM flaws (layer and cross-layer) that are closely correlated with nonlinear mechanical system dynamic responses of the parts.
Industry-ready Nonlinear Resonance Ultrasound Inspection implementations have emerged and are being deployed, each with strengths and weaknesses requiring elucidation and guidance for potential users; confusion and lack of clarity around vocabulary.
The guide will help users understand the relative strengths and weaknesses of each implementation, and provide clarity around the proliferation of names, abbreviations and terminology. Users will include those seeking to detect high-aspect ratio flaws (cracks, contact cracks, kissing bonds, delaminations); production managers requiring rapid NDT.
