基于MJF的极小曲面结构力学行为及吸能特性研究
The Study on Mechanical Behavior and Energy Absorption Characteristics of Minimal Surface Structures Based on MJF
肖江海 1侯俊玲 1李群1
作者信息
- 1. 复杂服役环境重大装备结构强度与寿命全国重点实验室,西安交通大学航天航空学院,西安,710049
- 折叠
摘要
极小曲面结构是一种表面连续光滑的曲面多孔结构,具有低密度、高强度以及优良的减震吸能等特性,在航空航天、汽车工业、机械装备等领域的结构轻量化设计方面,具有广泛的应用前景.本文采用多射流熔融(MultiJet Fusion,MJF)增材制造技术,结合参数化建模方法,以尼龙PA12为原料制备了体积分数同为20％的3种极小曲面多孔结构(G曲面、P曲面、D曲面).利用准静态压缩试验和数值模拟,分析了不同极小曲面结构的力学响应和吸能特性.研究发现:在力学响应方面,3种极小曲面的平台名义应力分别为4.0 MPa、2.1 MPa和4.75 MPa,明显高于相同体积分数下BCC点阵结构的平台名义应力(2.0 MPa),具有更好的承载能力;在吸能方面,G曲面、P曲面和D曲面的单位体积吸能量近似可达BCC点阵结构的7倍、4倍、8倍.综上所述,与传统BCC点阵结构相比,MJF增材制造工艺制备的极小曲面结构能够更好的分散压力,减少应力集中,表现出优异的力学性能和吸能特性,具有非常好的应用前景.
Abstract
The minimal surface structure is a continuous and smooth porous structure.It has the ad-vantages of low density,high intensity,and excellent energy absorption capability.This paper has studied the mechanical properties and energy absorption characteristics of the minimal surface prepared by additive manufacturing process using nylon PA12.First,using the parametric modelling method,three kinds of minimal surface porous structures(G-surface,P-surface,and D-surface)with the same volume fraction of 20％are designed.The corresponding minimal surface structures are manufactured with Multi Jet Fusion(MJF)additive manufacturing technology.The mechanical response and energy absorption characteristics of different minimal surface structures are then analyzed by combining quasi-static compression tests and numerical simulations.For the mechanical response,it is found that the three kinds of minimal surface structures show better load-bearing capacities compared with the traditional BCC lattice structure.In de-tail,the nominal stresses of the three minimal surface structures(G-surface,P-surface,and D-surface)are 4.0 MPa,2.1 MPa,and 4.75 MPa,respectively.The nominal stress value of the BCC lattice structure under the same volume is 2.0 MPa.It is clear that all values of the three minimal surface structures are significantly higher than that of the BCC lattice structure.For the study of energy absorption,the energy absorption per unit volume is used as one of key parameter to evaluate the energy absorption characteristic of the porous structure.The results indicate that the values of the energy absorption per unit volume for the three minimal surface structures(G-surface,P-surface,and D-surface)are all higher than that of the BCC lattice structure.The energy absorption per unit volume for the three minimal surface structures can approximately reach 7,4,and 8 times that of the BCC lattice structure.In conclusion,the minimal surface structure can show excellent characteristics of mechanical property and energy absorption and has extensive application prospects in the fields of aerospace,automotive industry,and machinery.
关键词
极小曲面/多孔结构/增材制造/力学性能/吸能特性Key words
minimal surface/porous structure/additive manufacturing/mechanical property/energy absorption characteristic引用本文复制引用
基金项目
国家自然科学基金(12002256)
国家自然科学基金(12172270)
中央高校基本科研业务费专项(xzy12023021)
浙江省自然科学基金探索项目(LQ20A020010)
出版年
2024
NETL
NSTL
万方数据