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Affiliation of Author(s):能源与动力学院

Journal:FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES

Key Words:crack growth fatigue small crack stress ratio titanium alloy

Abstract: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 No.:8756-758X

Translation or Not:no

Date of Publication:2019-01-01

Co-author:Zhu, Lei,jiangrong,syd,Qu, Shou-Dao

Correspondence Author:Hu Xuteng