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为研究超塑性成形/扩散连接组合工艺制备的钛合金四层结构中芯层结构、芯层和蒙皮的扩散连接面积比率及芯层之间的扩散连接率对结构强度、刚度的影响规律,采用FEM分析了不同芯层结构、直筋数量及工艺参数条件下的多层结构零件强度、刚度变化规律,并重点研究了0.5 H/L和延伸率等关键因素的最佳取值区间。结果表明:超塑性成形/扩散连接四层结构件的芯层结构设计对强度和刚度影响较大,控制0.5 H/L值及芯层延伸率,可以使强度刚度均达到最高,最大限度地发挥四层结构的整体优势。同时,两相邻芯层在胀起时形成的圆角半径大小对芯层之间及芯层和蒙皮的扩散连接焊合率有很大影响,进而影响多层结构的强度和刚度。
In order to study the effect of the core layer structure, the ratio of diffusion connection area between the core layer and the skin and the diffusion connection rate between the core layers on the structure strength and stiffness of the titanium alloy in the four-layer structure of titanium alloy prepared by the superplastic forming / diffusion bonding combination process, The strength and stiffness of the multi-layer structure under different core structures, number of straight bars and process parameters were analyzed by using FEM. The best value interval of key factors such as 0.5 H / L and elongation were studied emphatically. The results show that the core structure design of the superplastic forming / diffusion bonding four-layer structure has a great influence on the strength and stiffness. Controlling the 0.5 H / L value and the core elongation can achieve the highest strength and rigidity and maximize the strength The overall advantage of the four-tier structure. At the same time, the radii of fillet formed by two adjacent cores greatly influence the welding ratio of diffusion bonding between the core layers and between the core layer and the skin, thus affecting the strength and stiffness of the multilayer structure.