NDLI: The acousto-ultrasonic approach

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The acousto-ultrasonic approach

Content Provider	NASA Technical Reports Server (NTRS)
Author	Vary, Alex
Copyright Year	1987
Description	The nature and underlying rationale of the acousto-ultrasonic approach is reviewed, needed advanced signal analysis and evaluation methods suggested, and application potentials discussed. Acousto-ultrasonics is an NDE technique combining aspects of acoustic emission methodology with ultrasonic simulation of stress waves. This 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 underlying factors.
File Size	1221823
Page Count	32
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19870011129
Archival Resource Key	ark:/13960/t1ck39400
Language	English
Publisher Date	1987-01-01
Access Restriction	Open
Subject Keyword	Evaluation Nondestructive Tests Shear Strength Fiber Composites Acoustics Filament Winding Laminates Tensile Strength Ultrasonics Concentration Composition Spectrum Analysis Stress Waves Fracture Strength Signal Analysis Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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