泡沫钢填充管的准静态压缩变形模式、力学性能及吸能特性  

Quasi-Static Compression Deformation Mode,Mechanical Property and Energy Absorption Performance of Steel Foam Filled Tubes

作　　者：张光成 郭超群 闫治坤 周芸[1] 左孝青[1] ZHANG Guangcheng;GUO Chaoqun;YAN Zhikun;ZHOU Yun;ZUO Xiaoqing(Faculty of Materials Science and Engineering,Kunming University of Science Technology,Kunming 650093,China)

机构地区：[1]昆明理工大学材料科学与工程学院,昆明650093

出　　处：《材料导报》2021年第24期24158-24163,共6页Materials Reports

基　　金：国家自然科学基金项目(51861020)。

摘　　要：本工作以430L不锈钢粉为原料,采用粉末冶金法制备泡沫钢,然后通过物理粘结法将泡沫钢芯与薄壁金属管结合,分别对空管和泡沫金属填充管进行准静态轴向压缩实验,并对比分析空管和填充管的压缩变形模式、力学性能和吸能性能。研究表明:在压缩变形过程中,空铝管和泡沫钢填充铝管均呈现轴对称变形模式,而空钢管呈现非轴对称变形模式,泡沫钢填充钢管呈现混合变形模式;泡沫钢填充铝管抗压强度约为56.09 MPa,比泡沫铝填充铝管高1.69倍;泡沫钢填充钢管抗压强度高达116.03 MPa,比泡沫铝填充钢管高1.05倍;当应变量为40%时,泡沫钢填充铝管单位体积能量吸收值为27.93 MJ/m^(3),是泡沫铝填充铝管吸能值的2.91倍,泡沫钢填充钢管单位体积能量吸收值为35.98 MJ/m^(3),是泡沫铝填充钢管吸能值的1.15倍;当泡沫钢填充铝管的壁厚由1 mm增大到2 mm时,泡沫钢填充管的平台应力值增大1.36倍;在应变量为40%时,单位体积能量吸收值增大1.26倍,同时泡沫钢填充管在压缩过程中的变形褶皱数随着壁厚的增加而减少。430L stainless steel powder is used as the raw materials to prepare steel foams by powder metallurgy,and then the steel foam core is combined with the thin-walled metal tubes by physical bonding.The quasi-static axial compression experiments were performed on the empty tubes and the metal foam-filled tubes respectively.The compression deformation mode,mechanical properties and energy absorption perfor-mance of the empty and filled tubes were compared and analyzed.The results show that during the compression deformation process,both the empty aluminum tubes and the steel foam-filled aluminum tubes present axisymmetric deformation mode,and while the empty steel tubes present non-axisymmetric deformation mode,the steel foam-filled steel tubes present mixed deformation mode.The compressive strength of steel foam-filled aluminum tubes is about 56.09 MPa,which is 1.69 times higher than aluminum foam-filled aluminum tubes;the compressive strength of steel foam-filled steel tubes is as high as 116.03 MPa,which is 1.05 times higher than aluminum foam-filled steel tubes.When the strain is 40%,the energy absorption value per unit volume of the steel foam-filled aluminum tubes is 27.93 MJ/m^(3),which is 2.91 times that of the aluminum foam-filled aluminum tubes,and the energy absorption value per unit volume of the steel foam-filled steel tubes is 35.98 MJ/m^(3),which is 1.15 times that of aluminum foam-filled steel tubes.When the wall thickness of the steel foam-filled aluminum tubes increases from 1 mm to 2 mm,the platform stress value of the steel foam-filled tubes increases by about 1.36 times.When the strain is 40%,the energy absorption per unit volume increases by about 1.26 times,and the number of deformation folds of the steel foam-filled tubes during the compression process decreases with the increase of the wall thickness.

关 键 词：泡沫钢 薄壁管 填充管 静态压缩 吸能值 平台应力值 

分 类 号：TG142[一般工业技术—材料科学与工程]