摘要
金属空心球多胞材料结构是一种新型的多孔金属材料,它是由多个金属空心球组合而成,对于单个金属空心球的力学行为研究是整体材料力学性能的基础。通过对外径2 mm^3 mm,且壁厚不等厚(壁厚10μm^40μm)的单个超薄壁多孔空心球体进行纳米压痕试验、准静态单轴压缩试验以及纯弹性阶段的压缩试验,进而得到该金属空心球体材料和整个球体的弹性模量等相关力学参数,以及金属空心球体压缩变形过程和特征,并对金属空心球体弹性阶段采用有限元软件Abaqus进行模拟,分析孔隙率对于球体弹性模量的影响,结果表明,随着球壁孔隙率的增大,球体的弹性模量减小,且呈非线性分布,并可以描述成与球壁孔隙率与球壁材料的力学性能关系相同的幂函数形式。
Cellular metal materials structure is a new type of porous metal material,it is made up by lots of metal hollow spheres(MHS),and mechanical behavior research of the single metallic hollow sphere is the foundation of the whole material mechanical performance.The individual MHS with 2 mm to 3 mm outside diameter,10μm to 40μm thick walls with porosity were studied,and nano-indentation test,quasi-static uniaxial compression experiment and elastic compression test were performed on the metallic hollow spheres to get the Young’s modulus and hardness of the MHS and the material which was made up of the sphere,also single MHS compression deformation process and characteristics could be observed,finally simulated elastic stage of metallic hollow sphere by finite element software ABAQUS,analyzed the influence of the Young’s modulus of the whole MHS by porosity on thin wall,and result shows that with the porosity increasing,the elastic modulus of MHS will decrease,and present nonlinear distribution,it can be described the same format of a power law function as the relation of porosity with the porous thin wall.
作者
宋金良
张益康
孙全胜
SONG JinLiang;ZHANG YiKang;SUN QuanSheng(Department of Civil Engineering,Northeast Forestry University,Harbin 150040,China)
出处
《机械强度》
CAS
CSCD
北大核心
2019年第4期833-839,共7页
Journal of Mechanical Strength
基金
哈尔滨创新人才研究专项基金(RC2017QN012019)资助~~
关键词
金属空心球
薄壁结构
纳米压痕
力学性能
数值模拟
Metallic hollow sphere
Thin-walled structure
Nano-indentation
Mechanical properties
Numerical simulation
