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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。
In order to study the crack propagation characteristics of Ti-alloy diffusion-bonded layered composite structures, the crack propagation experiments of titanium alloy raw material plates and diffusion bonded composite plates with retaining zones were carried out. Crack propagation data were obtained through fracture interpretation. Crack propagation dc / d Nc curve, the crack propagation life and crack propagation law of the two specimens were compared and analyzed. The results show that there is a significant difference in crack propagation life between two specimens extending from 1.5mm to the specimen fracture, and the crack propagation life of the diffusion bonded composite laminates with the weld zone is significantly higher than that of the original material. At the same time, the crack propagation rate along the direction of the aperture of the composite laminates is obviously lower than that of the monolayer raw material plates, which is due to the slowing down of the crack propagation caused by the presence of the interface at the lands of the diffusion bonded composite laminates.