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Non-Destructive Evaluation of Deformation and Fracture Properties of Materials using Stress-strain Microprobe

Published online by Cambridge University Press:  10 February 2011

K. L. Murty ,
M. D. Mathew ,
P. Q. Miraglia ,
V. N. Shah  and
F. M. Haggag
K. L. Murty
Affiliation:
North Carolina State University, Raleigh, NC 27695-7909
M. D. Mathew
Affiliation:
North Carolina State University, Raleigh, NC 27695-7909
P. Q. Miraglia
Affiliation:
North Carolina State University, Raleigh, NC 27695-7909
V. N. Shah
Affiliation:
Idaho National Engineering and Environmental Laboratory, Idaho Falls, ID 83415-3870
F. M. Haggag
Affiliation:
Advanced Technology Corporation, 661 Emory Valley Road, Suite A, Oak Ridge, TN 37830
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Abstract

Tensile deformation and fracture properties of several metallic materials, welds, and their heataffected-zones were determined non-destructively using the Stress-Strain Microprobe (SSM) system. The system is based on automated ball indentation (ABI) technique and involves straincontrolled multiple indentations at the same location on the material surface by a small spherical indenter. The technique permits evaluation of tensile deformation parameters such as yield strength, ultimate tensile strength, strength coefficient, and strain-hardening exponent, and a fracture energy parameter called indentation energy to fracture. ABI tests were conducted on carbon steels, stainless steels, nickel alloys, aluminum alloys, Zircaloys, electronic soldering materials and several nuclear pressure vessel steels (in the unirradiated, neutron irradiated, and irradiated and thermally annealed conditions). For all these test materials and conditions, the ABI-derived results were found to agree with the data from conventional standard test methods. In addition to the laboratory applications of SSM, it can be used as an in-situ testing instrument for non-destructive assessment of deformation and fracture properties of operating structural components.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 503: Symposium JJ – Nondestructive Characterization of Materials in Aging Systems , 1997 , 327
Copyright
Copyright © Materials Research Society 1998

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References

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