QUANTITATIVE-ANALYSIS OF MICROSTRUCTURAL EFFECTS ON FATIGUE CRACK GROWTH IN WIDMANSTATTEN TI-6AL-4V AND TI-8AL-1MO-1V

被引：131
作者：
YODER, GR
COOLEY, LA
CROOKER, TW
机构：
[1] Material Science and Technology Division, Naval Research Laboratory, Washington
来源：
ENGINEERING FRACTURE MECHANICS | 1979年 / 11卷 / 04期
关键词：
D O I：
10.1016/0013-7944(79)90138-3
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
Analysis of fatigue crack growth behavior of five beta-annealed alloys indicates significant effects of microstructure upon the logarithmic plot of fatigue crack growth rate (da/dN) vs stress-intensity range (ΔK). Each plot exhibits a bilinear form with a transition at ΔKT, the position of which lies between 18 and 31 MPa · m 1 2 for the five alloys. Comparison of mean Widmanstätten packet size to cyclic plastic zone size, as analyzed on the basis of different models, indicates their equality at ΔKT. Greater clustering of the packet size distribution about the mean value effects a decrease in hypertransitional exponent (mA) in the power law, da/dN = C(ΔK)m, and a simulataneous increase in the sharpness of transition. Hypertransitional exponents for the five alloys lie between 2.9 ≤ mA ≤ 4.7, whereas hypotransitional exponents lie between 5.9 ≤ mB ≤ 7.6. Hypotransitional growth rates vary inversely with mean packet size, with a 20-fold reduction in da/dN observed for a 3.5-fold increase in mean packet size. © 1979.
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页码：805 / &
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