Abstract
Fatigue crack growth rate tests of commercial pure titanium specimens with 5 different height-width ratios of CT specimens using the digital imagine correlation technique are carried out. The traditional stress intensity factor range, ?K, and the new definition of the stress intensity factor range, ?KCJP, which is under the theory of the CJP model, are utilized in the analysis of the test data. Both the da/dN-?K curve and the da/dN-?KCJP curve reflect the distribution of the test data effectively and show good fitting effects. Compared to the traditional ?K, the ?KCJP is obtained directly from the displacement fields near the crack tip and can be utilized without correction, and has a characteristic of height-width ratio-independent for CT specimens. Furthermore, as two component parameters of ?KCJP, both ?KF and ?KR show some certain general change trends with the traditional ?K, which can be described by using the quadratic polynomial and the linear equation respectively. Based on this, a correlation curve is constructed to determine the expression of ?KCJP. Thus, an effective approach is established for using the da/dN-?KCJP curve in the failure analysis and the safety assessment of materials and structures, which extends the engineering applications of the CJP model.
DOI
10.3901/jme.2018.18.076
Publication Date
2018-01-01
Publication Title
Journal of Mechanical Engineering
Volume
54
Issue
18
Publisher
Chinese Journal of Mechanical Engineering
ISSN
0577-6686
Embargo Period
2024-11-22
First Page
76
Last Page
76
Recommended Citation
YANG, B. (2018) 'Fatigue Crack Growth Rate Curve Based on the CJP Model and Its Application Method', Journal of Mechanical Engineering, 54(18), pp. 76-76. Chinese Journal of Mechanical Engineering: Available at: https://doi.org/10.3901/jme.2018.18.076
