Transactions of Materials and Heat Treatment

Title：SPF/DB forming process and structural optimization on titanium alloy Kagome lattice

Authors： Wu Yong1 2 Wu Dipeng1 2 Chen Minghe1

Unit： 1. College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and Astronautics 2. State Key Laboratory of Mechanics and Control for Aerospace Structures Nanjing University of Aeronautics and Astronautics

KeyWords： TC31 titanium alloy lattice structure superplastic forming/diffusion bonding surface depression surface compressive strength

ClassificationCode：TG302

year,vol(issue):pagenumber：2023,48(5):162-167

Abstract：

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.

Funds：

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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