Nondestructive evaluation of residual stress in anisotropic materials

Technical Report · Tue May 01 04:00:00 EDT 1990

DOI:https://doi.org/10.2172/6452606· OSTI ID:6452606

Johnson, G C ^[1]

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1. California Univ., Berkeley, CA (USA). Dept. of Mechanical Engineering

The specific focus on anisotropic materials in the research was addressed in a manner which was primarily analytical. All of the experiments involving materials with substantial elastic or plastic anisotropy indicated that the materials in question exhibited a level of acoustoelastic response which was at or below the limit for useful stress evaluation. Nevertheless, the analysis performed indicates that if an experimental system is built which allows determination of the velocity variation roughly an order of magnitude more precisely than is possible with the system used in this work, the complete state of residual stress may be obtained, despite the presence of anisotropy. This report consists of a detailed description of the technique and experimental system proposed for the evaluation of residual stress states. The underlying analytical developments are reviewed, and a numerical investigation into the application of this approach for anisotropic materials is presented. It is shown that an accurate assessment of the complete residual stress state may be obtained even in cases of extreme anisotropy. Finally, an experimental investigation of the technique is presented in which the experimentally determined stress state is compared with that predicted numerically. It is shown that the two estimates of stress agree well for the material involved. 12 refs., 5 figs., 1 tab.

• Research Organization: Lawrence Livermore National Lab., CA (USA); California Univ., Berkeley, CA (USA). Dept. of Mechanical Engineering
• Sponsoring Organization: DOE/DP
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6452606
• Report Number(s): UCRL-CR-104838; ON: DE91000952
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
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42 ENGINEERING
420500* -- Engineering-- Materials Testing
ANISOTROPY
DESTRUCTIVE TESTING
DOCUMENT TYPES
MATERIALS TESTING
NONDESTRUCTIVE TESTING
PROGRESS REPORT
RESIDUAL STRESSES
RESOLUTION
SHEAR
SPATIAL RESOLUTION
STRESSES
TESTING
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