TA32钛合金点阵结构成形与力学性能研究  

Study on forming and mechanical properties of TA32 titanium alloy lattice structure

作　　者：刘杨 李志强[3] 赵冰 孙朝阳 张宁[3] Liu Yang;Li Zhiqiang;Zhao Bing;Sun Chaoyang;Zhang Ning(School of Mechanical Engineering,University of Science and Technology Beijing,Beijing 100083,China;Beijing Key Laboratory of Lightweight Metal Forming,University of Science and Technology Beijing,Beijing 100083,China;AVIC Manufacturing Technology Institute,Beijing 100024,China)

机构地区：[1]北京科技大学机械工程学院,北京100083 [2]北京科技大学金属轻量化成形制造北京市重点实验室,北京100083 [3]中国航空制造技术研究院,北京100024

出　　处：《锻压技术》2024年第7期168-178,共11页Forging & Stamping Technology

基　　金：国家自然科学基金资助项目(U22A20186);航空科学基金(2022Z047025001)。

摘　　要：通过实验和仿真研究了TA32钛合金点阵结构的超塑成形过程和点阵结构不同部位压缩/弯曲力学性能与变形特征。结果表明,优化的超塑成形气压加载曲线满足了点阵结构变形应变速率约束和良好成形的需求。基于超塑变形后的有限元网格有效地构建了点阵结构力学性能仿真模型,并实现超塑成形缺陷的保留与传递。点阵结构的边缘蒙皮部位在超塑成形过程中出现了成形不完全和筋条扭曲等成形缺陷。边缘蒙皮部位点阵结构压缩过程变形特征主要为筋条塑性屈曲和结构的剪切变形相互作用,弯曲过程变形特征主要为筋条塑性屈曲和上面板皱曲。中心部位点阵结构的压缩、弯曲变形特征均为筋条塑性屈曲和筋条-面板间形成支撑结构。The superplastic forming process of TA32 titanium alloy lattice structure,as well as the compression/bending mechanical properties and deformation characteristics in different parts of lattice structure were investigated by experiments and simulations.The results indicate that the optimized loading curve of gas pressure for superplastic forming meets the constraint of strain rate lattice structure deformation and the requirement of precision forming.Based on the finite element mesh after superplastic deformation,the simulation model of lattice structure mechanical properties was effectively constructed,and the preserving and transferring of superplastic deformation defects were achieved.Incomplete forming and rib distortion defects are observed at the edge skin part of lattice structure during the superplastic forming process.The deformation characteristics at the edge skin part of lattice structure during the compression process are mainly the interaction between the plastic buckling of ribs and the shear deformation of structure.The deformation characteristics during the bending process are mainly the plastic buckling of ribs and the wrinkling of upper panel.The compression and bending deformation characteristics of the central lattice structure are the plastic buckling of ribs and the formation of supporting structures between ribs and panel.

关 键 词：TA32钛合金 点阵结构 超塑成形/扩散连接 压缩 弯曲 力学性能 

分 类 号：TG302[金属学及工艺—金属压力加工]