Development of a Nondestructive Non-Contact Acousto-Thermal Evaluation Technique for Damage Detection in Materials (Preprint)

Abstract

This paper presents the development of a new non-contact acousto-thermal signature (NCATS) nondestructive evaluation (NDE) technique. The physical basis of the method is the measurement of the efficiency of the material to convert acoustic energy into heat, and a theoretical model has been developed. The increase in temperature due to conversion of acoustic energy injected into the material without direct contact was found to depend on the thermal and elastic properties of the material. In addition, it depends on the experimental parameters of the acoustic source power, the distance between sample and acoustic source, and the period of acoustic excitation. Systematic experimental approaches to optimize each of the experimental variables to maximize the observed temperature changes are described. The potential of the NCATS technique to detect microstructural-level changes in materials is demonstrated by evaluating accumulated damage due to plasticity in Ti-6Al-4V and low level thermal damage in polymer matrix composites.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 2011
Accession Number
ADA553402

Entities

People

  • John T. Welter
  • Kumar V. Jata
  • Norman Schehl
  • Shamachary Sathish
  • Thomas R. Boehnlein

Organizations

  • University of Dayton

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acoustic Horns
  • Acoustic Waves
  • Air Force
  • Air Force Research Laboratories
  • Climate Change
  • Composite Materials
  • Damage Detection
  • Detection
  • Elastic Properties
  • Materials
  • Measurement
  • Modulus Of Elasticity
  • Physical Properties
  • Plastic Properties
  • Polymer Matrix Composites
  • Stress Strain Relations
  • Thermal Conductivity

Readers

  • Pulsed Power and Plasma Physics.
  • Structural Health Monitoring of Composite Structures.