作　　者： ; ; ;

机构地区： 天津科技大学机械工程学院

出　　处： 《河北科技大学学报》 2011年第5期435-440,481,共7页

摘　　要： 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 influence of the structure of core sheet,the ratio of the diffusion bonding area between the core layer and cover layer,and the ratio of diffusion bonding area between core sheets on the strength of multi-layer structure fabricated by superplastic forming/diffusion bonding process,FEM is used to analyze the rigidity and strength of different parts with different structures of core sheet and process parameters.In the research emphasis is put on two critical factors： 0.5 H/L and the elongation.The results show that the structure of core has greater influence on the rigidity and strength of multi-layer titanium hollow panel structure and the controlling of the value of 0.5 H/L and elongation can realize maximal rigidity and strength,which maximize the overall advantages of multi-layer structure.Meanwhile,the radius of corner between the two near core sheets have greater influence on the ratio of diffusion bonding area between core sheet and cover sheet and two near core sheets,thereby affecting the strength and rigidity of multi-layer structure.

关 键 词： 超塑性成形 扩散连接 扩散连接率 芯层结构

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]