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《Acta Materiae Compositae Sinica》 2017-01
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Fatigue crack growth rate determination of graded titanium alloys and the influence of gradient for propagation life

ZHAO Zhenbo;XU Xiwu;GUO Shuxiang;State Key Laboratory of Mechanics and Control of Mechanical Structures,Nanjing University of Aeronautics and Astronautics;  
To make sense of the crack growth rate distribution in graded material,a standard three-point bending fatigue test was performed on two groups of cracked graded titanium alloys TC11-TC4 and TA15-TA2.Test results show that the same components in different parts of graded structure shear an identical propagation property and the Paris formulas of the four kinds of 3Dprinting titanium alloy have been determined.The variation distribution of elastic modulus influences the stress intensity factor and inhibits the propagation of crack in the lower modulus side.During influence thickness of transition layer,propagation rate is between that of the two components and varies continuously,proving that gradient is able to eliminate the interface effect in the connection of dissimilar materials.A mixing law based on volume rate has been proposed to describe the distribution of crack propagation rate.In the test under constant periodic load,there was a remarkable difference in the propagation life of specimens only propagated along different directions.It means damage tolerance in graded structures can be improved with a reasonable arrangement of the gradient.The variation distribution of modulus and fatigue property both influence the propagation lives.
【Key Words】: graded material fatigue propagation Paris formula propagation life test research
【Fund】: 中央高校基本科研业务费专项资金(NS2016003);; 机械结构力学及控制国家重点实验室(南京航空航天大学)自主研究课题(0213G01)
【CateGory Index】: O346.1
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