ISSN: 0090-3973
Page Count: 6

An Evaluation of a Load-Line Extensometer for Elastic-Plastic Fracture Toughness Testing
Williams, JA
Senior research engineer and advanced engineer, W/A-124, Westinghouse Hanford Co., Wash.

Carlson, KW
Senior research engineer and advanced engineer, W/A-124, Westinghouse Hanford Co., Wash.

Abstract

A load-line extensometer using linear variable differential transformer (LVDT) displacement transducers was developed and evaluated for use in multispecimen and single specimen J value versus crack growth (J-R) curve testing. The LVDT extensometer accuracy and repeatability was compared with that of clip gage extensometers commonly used in fracture toughness evaluatons. Data on load versus displacement and J value versus crack growth for ASTM A533, Grade B, Class 1 (Unified Numbering System [UNS] K12539) steel obtained by using both extensometers were also compared.

Keywords:
extensometers, fracture tests, crack propagation, unloading compliance tests, J integral, computer data acquisition

Paper ID: JTE11235J
DOI: 10.1520/JTE11235J
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