Nonuniform Deformation of Cell Structures Owing to Plastic Stress Wave Propagation

被引:0
作者
Tateyama, Kohei [1 ]
Yamada, Hiroyuki [2 ]
机构
[1] Ritsumeikan Univ, Dept Mech Engn, 1-1-1 Nojihigashi, Kusatsu 5258577, Japan
[2] Natl Def Acad, Dept Mech Engn, 1-10-20 Hashirimizu, Yokosuka 2398686, Japan
来源
APPLIED MECHANICS | 2021年 / 2卷 / 04期
关键词
cell structures; stress wave; impact deformation; nonuniform deformation; STRAIN-RATE; SHOCK ENHANCEMENT; PART II; IMPACT; FOAMS; DENSITY; MICROSTRUCTURE; BEHAVIOR;
D O I
10.3390/applmech2040053
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
In cell structures, unlike in dense bodies, nonuniform deformation occurs from the impact end, even at velocities in the order of tens to hundreds of meters per second. In this study, we experimentally examine the nonuniform deformation mechanism of cell structures. They prepared two kinds of specimens: nickel foam (Ni foam) and silicone-rubber-filled nickel foam (Ni/silicone foam). As a dynamic and impact test method (compression velocity of 20 m/s or more), we used a dynamic and impact load-measuring apparatus with opposite load cells to evaluate the loads on both ends of the specimen in one test. At compression velocities of 20 m/s or less, no nonuniform deformations were observed in the Ni foam and the Ni/silicone foam, and the loads on the impact and the fixed ends achieved force equilibrium. The Ni foam showed no change with an increasing strain rate, and the Ni/silicone foam showed a strong strain rate dependence of the flow stress. At a compression velocity of approximately 26 m/s, the loads differed at the two ends of the Ni/silicone foam, and we observed nonuniform deformation from the impact end. The results of the visualization of the load and deformation behavior obtained from both ends of the specimen revealed that the velocity of the plastic stress wave and the length of the specimens are important for nonuniform deformation.
引用
收藏
页码:911 / 931
页数:21
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