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所属单位：能源与动力学院

发表刊物：FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES

关键字：crack growth fatigue small crack stress ratio titanium alloy

摘要：In this paper, the small fatigue crack behavior of titanium alloy TC4 at different stress ratios was investigated. Single-edge-notch tension specimens were fatigued axially under a nominal maximum stress of 370 MPa at room temperature. Results indicate that fatigue cracks in TC4 initiate from the interface between alpha and beta phases or within alpha phase. More than 90% of the total fatigue life is consumed in the small crack initiation and growth stages. The crack growth process of TC4 can be divided into three typical stages, ie, microstructurally small crack stage, physically small crack stage, and long crack stage. Although the stress ratio has a significant effect on the total fatigue life and crack initiation life at constant sigma(max), its effect on crack growth rate is indistinguishable at R = -0.1, 0.1, and 0.3 when crack growth rate is plotted as a function of increment K.

ISSN号：8756-758X

是否译文：否

发表时间：2019-01-01

合写作者：Zhu, Lei,江荣,宋迎东,Qu, Shou-Dao

通讯作者：胡绪腾