钛合金层状复合结构裂纹扩展性能研究  

Research on crack propagation characteristic for diffusion bonded laminates of titanium alloy

作　　者：盖鹏涛[1,2,3] 李晓华[1,2,3] 刘佳佳[1,2,3] 韩秀全 毕金英[4] 

机构地区：[1]北京航空制造工程研究所,北京100024 [2]塑性成形技术航空科技重点实验室,北京100024 [3]数字化塑性成形技术与装备北京市重点实验室,北京100024 [4]沈阳飞机设计研究所,沈阳110035

出　　处：《塑性工程学报》2016年第5期156-159,共4页Journal of Plasticity Engineering

摘　　要：为了研究钛合金扩散连接层状复合结构的裂纹扩展特性,进行了钛合金原材料板和含止焊区的扩散连接复合层板裂纹扩展试验,通过断口判读获取裂纹扩展数据,建立了裂纹扩展dc/d N-c曲线,对两种试件的裂纹扩展寿命和裂纹扩展规律进行了对比分析。结果表明,两种试件沿孔径方向的裂纹长度从1.5mm扩展至试件断裂对应的裂纹扩展寿命存在明显差别,含止焊区的扩散连接复合层板的裂纹扩展寿命比原材料板显著提高,同时复合层板沿孔径方向的裂纹扩展速率明显低于单层原材料板,这是由于扩散连接复合层板止焊区界面的存在对裂纹扩展起到了明显的减缓作用。To research the crack propagation characteristics of diffusion bonded laminates of titanium alloy,the fatigue tests for the thick plates of titanium alloy and the diffusion bonded laminates of titanium alloy with localized stop-off area were conducted under the constant amplitude fatigue stress.The crack propagation dc/d N-c data were obtained by QF and the crack propagation lives were analyzed for the two sorts of titanium alloy specimens.The results indicate that it is different evidently on the crack propagation life of the two kinds of specimens,when the crack length extends from 1.5mm to fracture.The crack propagation lives of diffusion bonded laminates of titanium alloy with stop-off area are longer significantly than plates of titanium alloy.The crack propagation velocities along diameter direction of the center holes of titanium alloy laminates are lower distinctly than those of plates of titanium alloy.This is because the design of stop-off area inside the titanium alloy laminate hindered the propagation of crack effectively.

关 键 词：钛合金 扩散连接 层状复合结构 裂纹扩展 

分 类 号：TG146.23[一般工业技术—材料科学与工程]