钛合金及其扩散焊疲劳特性研究进展

李细锋, 李天乐, 安大勇, 吴会平, 陈劼实, 陈军

Research Progress of Titanium Alloys and Their Diffusion Bonding Fatigue Characteristics

LI Xifeng, LI Tianle, AN Dayong, WU Huiping, CHEN Jieshi, CHEN Jun

图8 TC4钛合金扩散焊层合结构疲劳断口形貌和裂纹扩展[61,62]

Fig.8 Fatigue fracture morphologies and crack growth of TC4 titanium alloy laminate by diffusion bonding (a) fractography of the laminates with unbonded zones (x—width direction, y—thickness direction; A—the direction along x-axis, B—along -x-axis, C—along y-axis; a1—distance of the outmost point on the left crack front from y-axis, a2—distance of the outmost point on the right crack front from y-axis)[61] (b) variation of fatigue crack growth rate with crack length and corresponding fractography (ar—half-crack length)[61] (c) fatigue crack growth process of laminated structure with unbonded zones based on the extended finite element method (Red regions represent initial crack)[62]