基于选区激光熔化的钛合金薄壁结构等刚度设计及性能研究

Equal Stiffness Design and Performance Research of Thin-Walled Titanium Alloy Structure Based on Selective Laser Melting

选区激光熔化(SLM)技术在加工中空薄壁结构方面具有巨大优势,通过刚度理论计算并设计中空等刚度薄壁结构,依据试验和数值模拟结合的方法验证设计的正确性。结果表明,在弯曲载荷下,变形区域主要集中在弯矩最大的中线处附近,在相同力加载下,所设计的三种空心矩形截面薄壁结构零件的位移几乎相同,对于单薄壁结构零件,由于弹性模量低于实体块零件的弹性模量,导致其中心所产生的位移小于空心矩形截面薄壁结构零件。对薄壁结构有限元模型的弯曲过程进行仿真,获得的等效应力应变等模拟结果与试验结果吻合。研究结论可以为SLM加工薄壁结构时进行截面设计提供理论支撑。

Selective laser melting(SLM)technology has great advantages in processing hollow thin-walled structures.Hollow thin-walled structures with equal stiffness are calculated and designed by stiffness theory,and the correctness of the design is verified by the combination of experiment and numerical simulation.The results show that under bending load,the deformation area is mainly concentrated near the center line of the maximum bending moment.Under the same force,the displacement of the three kinds of hollow rectangular section thin-walled structural parts is almost the same.For single thin-walled structural parts,because the elastic modulus is lower than that of solid block parts,the displacement produced by its center is smaller than that of hollow rectangular section thin-walled structural parts.The bending process of the finite element model of thin-walled structure is simulated,and the simulated results of equivalent stress and strain are consistent with the experimental results.The research conclusion can provide theoretical support for the section design of thin-walled structures processed by SLM.