ISSN: 1945-7553
CODEN: JTEVAB
Published Online: 22 January 2013
Page Count: 3

A Study on the Fitting Accuracy of CMOD Compliance Equations

Wang, Enyang
Postdoctoral Research Fellow, Dept. of Civil & Environmental Engineering, Western Univ., London, ON

Zhou, Wenxing
Assistant Professor, Dept. of Civil & Environmental Engineering, Western Univ., London, ON

Shen, Guowu
Research Scientist, CANMET Materials Technology Laboratory, Natural Resources Canada, Hamilton, ON

(Received 28 June 2012; accepted 10 September 2012)

Abstract

The maximum error of the inverse fitting of Tada et al.’s equation of the a/W–crack mouth opening displacement (CMOD) compliance equation proposed by Joyce and adopted in ASTM E1820-11 for single edge bend [SE(B)] specimens with shallow cracks (0.05 ≤ a/W < 0.45) is observed to be 2.03 % for 0.05 < a/W < 0.1. A new a/W–CMOD compliance equation with the same fifth-order polynomial fitting applicable for SE(B) specimens with 0.05 ≤ a/W ≤ 0.7 is therefore proposed. The maximum fitting error of the proposed equation is approximately 0.19 %.

Keywords:
E1820, SE(B), compliance equation, shallow crack, fitting accuracy

Paper ID: JTE20120213
DOI: 10.1520/JTE20120213
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