不同梯度变化方式的不规则多孔结构设计与力学性能分析  

Design and Mechanics Property Analysis for Different Graded Irregular Porous Structures

作　　者：汤永锋 路平[1,2] 刘斌[1,2] 江开勇[1,2] 颜丙功 刘嘉伟 韩伟 TANG Yongfeng;LU Ping;LIU Bin;JIANG Kaiyong;YAN Binggong;LIU Jiawei;HAN Wei(Fujian Key Laboratory of Special Energy Manufacturing,Huaqiao University,Xiamen,Fujian,361021;Xiamen Key Laboratory of Digital Vision Measurement,Huaqiao University,Xiamen,Fujian,361021)

机构地区：[1]华侨大学福建省特种能场制造重点实验室,厦门361021 [2]华侨大学厦门市数字化视觉测量重点实验室,厦门361021

出　　处：《中国机械工程》2022年第23期2859-2866,共8页China Mechanical Engineering

基　　金：福建省科技计划引导性项目(2019H0014,2020H0015);国家自然科学基金(52175230);福厦泉国家自主创新示范区省级专项(2019)。

摘　　要：基于Voronoi图设计了4种不同梯度变化方式的不规则多孔结构,通过光固化成形工艺制备了这4种梯度多孔结构。对这4种梯度多孔结构分别进行了纵向(载荷方向平行于梯度方向)和横向(载荷方向垂直于梯度方向)压缩实验,研究其变形特点和力学性能。结果表明,梯度多孔结构在横向压缩时的变形特点与均匀多孔结构相似,纵向压缩时则表现出逐层坍塌的变形特点。在孔隙率相近的情况下,不同的梯度变化方式能够影响纵向压缩时的力学性能,对横向压缩的力学性能基本没有影响。降低梯度多孔结构的平均孔隙率可以提高结构力学性能。最后通过等应力复合模型和Voigt模型预测了梯度多孔结构纵向和横向压缩的弹性模量,预测结果与实验结果的相对误差基本都在10%以内。Four different type graded irregular porous structures were designed based on the Voronoi diagram,and the four graded porous structure examples were prepared by the stereolithography molding technology.The longitudinal(load direction parallels to the graded direction)and transverse(load direction perpendiculars to the graded direction)compression tests were carried out on the four graded porous structures to study their deformation characteristics and mechanics properties.The results show that the deformation characteristics of the graded porous structures are similar to that of the uniform porous structure during transverse compression processes,and the deformation characteristics of layer-by-layer collapse are exhibited during longitudinal compression processes.In the case of similar porosity,different graded types may affect the mechanics properties in the longitudinal compression processes but have little effect on the mechanics properties in the transverse compression processes.Decreasing the average porosity of the graded porous structures may improve the mechanics properties of the structures.Finally,combining the iso-stress composite model and the Voigt model,the elastic modulus of the graded porous structures were predicted in the longitudinal and transverse compression processes respectively,and most of the relative errors between the predicted results and the experimental ones are less than 10%.

关 键 词：VORONOI图 梯度多孔结构 变形特点 力学性能 

分 类 号：TH11[机械工程—机械设计及理论]