锻压技术

钛合金Kagome点阵SPF/DB成形工艺及结构优化

英文标题：SPF/DB forming process and structural optimization on titanium alloy Kagome lattice

作者：武永1 2 吴迪鹏1 2 陈明和1

单位：1. 南京航空航天大学机电学院 2. 南京航空航天大学航空航天结构力学与控制全国重点实验室

分类号：TG302

出版年,卷(期):页码：2023,48(5):162-167

摘要：

超塑成形/扩散连接工艺(SPF/DB)可成形钛合金复杂曲面变厚度混合点阵结构，但因非均匀塑性变形会导致点阵内筋壁厚不均，对此类点阵结构的设计优化属于典型的多设计变量的高度非线性问题。将Kriging响应面模型和遗传算法引入到SPF/DB工艺制备的Kagome点阵结构优化设计中，并基于SPF/DB制造和面压缩性能的有限元仿真结果，构建了Kriging响应面，获得了结构参数对表面凹陷深度和面抗压强度的影响规律，采用遗传算法获得优化后的结构参数，并进行了实验验证。采用厚度为0.8 mm的芯板和1.2 mm的面板，利用SPF/DB工艺制备了Kagome点阵结构，发现在筋条与焊接点的过渡圆角处产生集中变形，最大减薄率为37.8%，面抗压强度为4.36 MPa，证明了结构参数的有效性。

The mixed lattice structures with complex curved surfaces and variable thickness of titanium alloy can be formed by superplastic forming/diffusion bonding (SPF/DB) process. But due to non-uniform plastic deformation, the wall thickness of ribs in the lattice is uneven, and the design optimization of such lattice structures is a typical highly nonlinear problem with multiple design variables. Therefore, the Kriging response surface model and genetic algorithm were introduced into the optimal design of the Kagome lattice structure prepared by SPF/DB process, and based on the finite element simulation results of SPF/DB manufacturing and surface compression performance, the Kriging response surface was constructed. Then, the influence laws of the structural parameters on the surface depression depth and the surface compressive strength were obtained, and the optimized structural parameters were obtained by genetic algorithm for experimental verification. The results show that for the core plate with thickness of 0.8 mm and the panel with thickness of 1.2 mm, in the Kagome lattice structure prepared by SPF/DB process, it is found that concentrated deformation occurs at the transition fillet between rib and welding point, and the maximum thinning rate is 37.8% and the surface compressive strength is 4.36 MPa, demonstrating the validity of the structural parameters.

基金项目：

国家自然科学基金资助项目（51805256）；中央高校基本科研项目（56XAC21017）；国家博士后基金资助项目（2020M670792）

作者简介：武永（1986-），男，工学博士，副教授,E-mail：wuyong@nuaa.edu.cn

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图6仿真及实验结果对比

(a) 表面凹槽轮廓(b) 筋条轮廓(c) 筋条减薄率(d) 面压缩曲线

Fig. 6Comparison of simulation and experimental results

(a) Outline of groove on surface (b) Outline of ribs (c)Thinning rate for ribs (d) Surface compression curve

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