TY - JOUR
T1 - Systematic assessment and validation of compliance-based crack closure measurements in fatigue
AU - Xu, Y.
AU - Gregson, P.J.
AU - Sinclair, I.
N1 - Copyright 2004 Elsevier Science B.V., Amsterdam. All rights reserved.
PY - 2000/1/1
Y1 - 2000/1/1
N2 - Different methods of closure measurement and issues related to the identification of closure points are examined. Based on compliance curves obtained from crack mouth clip gauges and near-tip strain gauges, a systematic assessment of closure measurements has been made by a variety of non-subjective methods. Closure results obtained from compliance curves are also compared with direct crack tip observations. For results obtained on a commercial Al alloy, AA2024-T351 plate, it is shown that curve fitting methods based on a combination of linear and quadratic functions provide particularly sensitive and consistent closure measurements. The potential separation of plane stress and plane strain closure effects that arise in real, three-dimensional specimens is demonstrated via a combination of global compliance measurements and the use of side-grooved specimens.
AB - Different methods of closure measurement and issues related to the identification of closure points are examined. Based on compliance curves obtained from crack mouth clip gauges and near-tip strain gauges, a systematic assessment of closure measurements has been made by a variety of non-subjective methods. Closure results obtained from compliance curves are also compared with direct crack tip observations. For results obtained on a commercial Al alloy, AA2024-T351 plate, it is shown that curve fitting methods based on a combination of linear and quadratic functions provide particularly sensitive and consistent closure measurements. The potential separation of plane stress and plane strain closure effects that arise in real, three-dimensional specimens is demonstrated via a combination of global compliance measurements and the use of side-grooved specimens.
U2 - 10.1016/S0921-5093(00)00758-9
DO - 10.1016/S0921-5093(00)00758-9
M3 - Article
AN - SCOPUS:0034031212
SN - 0921-5093
VL - 284
SP - 114
EP - 125
JO - Materials Science and Engineering A
JF - Materials Science and Engineering A
IS - 1-2
ER -