| RESEARCH PAPER |
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| Effect of Particle and Microstructure on Fatigue Crack Initiation and Growth Behavior of Cu/WCp Composites |
| ZHANG Yubo1, GUO Rongxin1,2, XIA Haiting1,2, YAN Feng1,2, WANG Shiyue1, LI Yibo1
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1 Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650500;
2 Yunnan Province University Key Laboratory of Advanced Material Mechanics Behavior and the Micro Structure Design, Kunming University of Science and Technology, Kunming 650500 |
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Abstract By in-situ scanning electron microscopy, the fatigue crack initiation and propagation behaviors of Cu/WCp compo-sites produced by powder metallurgy was studied, and effects of particle and microstructure on fatigue crack initiation and early pro-pagation mechanism of composites was analyzed. The results show that fatigue micro cracks initiated at the interface between WCp particles and matrix, potential fatigue cracks tend to nucleate and grow along particles. At low stress intensity factor range, the fatigue crack has obvious “abnormal phenomenon” and occupied 71% of the whole life. The early growth of fatigue crack was strongly affected by the local microstructure and WCp particles of composite, and the scattering of small fatigue cracks growth rate was large. As the length of a small crack was more than 150 μm, the crack growth rate increased rapidly until the specimen was quickly broken. Crack deflection, crack branching and the plastic wake decelerated the fatigue crack growth rate, however particle debonding accele-rated the composite fatigue crack growth rate. From the results of numerical simulation, the particle interface debonding of the composite was found to significantly enlarge the fatigue crack growth driving force, which accelerated the fatigue crack growth rate.
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Published: 25 September 2017
Online: 2018-05-08
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2017, Vol. 31 
