闭孔泡沫铝准静态压剪性能研究  

Mechanical Behaviors of Closed-Cell Aluminum Foams under Quasi-Static Compression-Shear Loads

作　　者：李雪艳[1] 李志斌[1] 张舵[1] LI Xueyan;LI Zhibin;ZHANG Duo(College of Science , National University of Defense Technology , Changsha 410073, China)

机构地区：[1]国防科技大学理学院,湖南长沙410073

出　　处：《高压物理学报》2018年第3期50-57,共8页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(11402299)

摘　　要：通过添加斜端面垫块和长方体套筒,利用材料试验机对闭孔泡沫铝进行准静态下的压剪复合加载实验。改变斜端面垫块的角度,得到泡沫铝在不同压剪加载路径下的力学性能。对试样进行受力分析,得到泡沫铝在压剪空间的屈服面。同时采用有限元软件LS-DYNA对闭孔泡沫铝的压剪加载过程进行数值模拟,仿真屈服面与实验屈服面吻合较好。仿真研究表明,密度相同的泡沫铝,在一定孔径范围内,胞孔尺寸越大,屈服应力越大,泡沫铝的承载能力越好。In the present work,we conducted the quasi-static compression-shear experiments on the closed-cell aluminum foams using an improved testing machine and installing beveled bars and a column sleeve.By changing the angle of the inclined beveled bars we obtained the mechanical properties of the aluminum foams in different compression-shear loading paths,and then figured out the aluminum foam’s experiment yield surface from the force analysis of the specimen used.At the same time,we simulated the compression-shear process of the closed-cell aluminum foams using the finite element software LS-DYNA.The simulated yield surface is in good agreement with the experimental yield surface.The results show that,for the aluminum foams of the same density and in a given range of the cell size,the yield strength of the closed-cell aluminum foams increases with the increase of the cell size,and so does its load capacity.

关 键 词：压剪复合加载 闭孔泡沫铝 十四面体模型 屈服面 孔径 

分 类 号：O341[理学—固体力学]