A sigmoidal equation for the high strain rate compression of porous metals

被引：3
|
作者：
Ruestes, Carlos J. [1 ,2 ]
Bertolino, Graciela M. [3 ]
Ruda, Margarita [4 ]
Bringa, Eduardo M. [5 ,6 ]
机构：
[1] Univ Nacl Cuyo, CONICET, RA-5500 Mendoza, Argentina
[2] Univ Nacl Cuyo, Fac Ciencias Exactas & Nat, RA-5500 Mendoza, Argentina
[3] Consejo Nacl Invest Cient & Tecn, CAB Inst Balseiro, Div Fis Metales, San Carlos De Bariloche, Rio Negro, Argentina
[4] CNEA CAB Dept Fisicoquim Mat, San Carlos De Bariloche, Rio Negro, Argentina
[5] Univ Mendoza, CONICET, RA-5500 Mendoza, Argentina
[6] Univ Mendoza, Fac Ingn, RA-5500 Mendoza, Argentina
来源：
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING | 2020年 / 137卷
关键词：
Porosity; Compaction; Compression; Foams; DYNAMIC PORE-COLLAPSE; PLASTIC-DEFORMATION; VOID GROWTH; ATOMISTIC SIMULATION; MECHANICAL RESPONSE; IMPLEMENTATION; STRENGTH; TANTALUM; IMPACTS;
D O I：
10.1016/j.ijimpeng.2019.103431
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The high strain rate compression of porous materials is a problem that presents a series of difficulties to continuum-scale codes, its computational cost being a major one. Following previous contributions suggesting that compaction can be defined in terms of volumetric strain, we propose to model the compaction of porous metals by means of a sigmoidal equation. The definition requires only four parameters, each of them with a physical meaning. We tested the proposed equation against molecular dynamics simulations of high strain rate compression of closed-cell and open-cell foams, as well as micro-scale data available in the literature. The equation can be used in micro and macro-scale codes where nano-scale porosity cannot be modeled explicitly.
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页数：6
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