TY - JOUR
T1 - Effects of component size, geometry, microstructure and aging on the embrittling behavior of creep crack growth correlated by the Q* parameter
AU - Yokobori, A. T.
AU - Sugiura, R.
N1 - Funding Information:
The authors are grateful for permission to use experimental data obtained by the Japan Society for Promotion of Science (JSPS) Committee 129 and from the VAMAS round-robin-tests. Part of the experimental work in this study was supported by the Grant-in-aid from National Institute for Materials Science (NIMS). The authors are grateful to Prof. T. Yokobori in Teikyo University, Dr. M. Tabuchi in NIMS, and Dr. A. Fuji in Ishikawajima-Harima-Heavy Industries Co. Ltd. for useful discussions. The authors thank Dr. V.A. Yardley in Tohoku University for fruitful discussion.
PY - 2007/4
Y1 - 2007/4
N2 - The driving force for creep crack growth is dominated by local elastic-plastic stress in the creep damage zone around a crack tip, temperature and microstructure. In previous work, C*, Ct, load line displacement rate dδ/dt and Q* parameters have been proposed as formulations of creep crack growth rate (CCGR). Furthermore, using parameters mentioned above, the construction of the algorithm of predictive law for creep crack growth life is necessary for life assessment procedures. The aim of this paper is to identify the effects of component size, geometry, microstructure, aging and weldment on the embrittling behavior of creep crack growth and incorporate these effects in a predictive law, using the Q* parameter. It was found that for specimen size (width and thickness) and of material softening due to aging the values of the activation energy were the same whereas for grain size change and structural brittleness, which affected crack tip multi-axial stress state the values for the activation energy for CCGR differ.
AB - The driving force for creep crack growth is dominated by local elastic-plastic stress in the creep damage zone around a crack tip, temperature and microstructure. In previous work, C*, Ct, load line displacement rate dδ/dt and Q* parameters have been proposed as formulations of creep crack growth rate (CCGR). Furthermore, using parameters mentioned above, the construction of the algorithm of predictive law for creep crack growth life is necessary for life assessment procedures. The aim of this paper is to identify the effects of component size, geometry, microstructure, aging and weldment on the embrittling behavior of creep crack growth and incorporate these effects in a predictive law, using the Q* parameter. It was found that for specimen size (width and thickness) and of material softening due to aging the values of the activation energy were the same whereas for grain size change and structural brittleness, which affected crack tip multi-axial stress state the values for the activation energy for CCGR differ.
KW - C parameter
KW - C parameter
KW - Load line displacement rate dδ/dt
KW - Q concept
KW - Weld component
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U2 - 10.1016/j.engfracmech.2006.10.004
DO - 10.1016/j.engfracmech.2006.10.004
M3 - Article
AN - SCOPUS:33846382408
VL - 74
SP - 898
EP - 911
JO - Engineering Fracture Mechanics
JF - Engineering Fracture Mechanics
SN - 0013-7944
IS - 6
ER -