On a dislocation-based constitutive model and dynamic thermomechanical considerations

被引：34
作者：
Nieto-Fuentes, J. C. [1 ]
Rittel, D. [1 ]
Osovski, S. [1 ]
机构：
[1] Technion, Fac Mech Engn, IL-32000 Haifa, Israel
来源：
INTERNATIONAL JOURNAL OF PLASTICITY | 2018年 / 108卷
关键词：
Taylor-Quinney coefficient; Dislocations; Rate-dependent material; Constitutive behavior; Kolsky bar; STRAIN RATE DEFORMATION; SEVERE PLASTIC-DEFORMATION; STACKING-FAULT ENERGY; SIZE-DEPENDENT PLASTICITY; STORED ENERGY; GLASSY-POLYMERS; SINGLE-CRYSTAL; CELL-FORMATION; FLOW-STRESS; FCC METALS;
D O I：
10.1016/j.ijplas.2018.04.012
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
Dislocation-based constitutive models are widely used to predict the plastic behavior of metallic materials, in both quasi-static and dynamic conditions. In addition, if the ratio of (adiabatic) thermomechanical (plastic work to heat) conversion is known, the stress-strain-temperature relationship can be estimated. The main purpose of this study was to verify the applicability of a widely-used expression (where the strain energy of a plastically deformed material is proportional to the density of dislocations) to calculate the stored energy in the material, which can be used in parallel with the micromechanical model to estimate the temperature rise during dynamic plastic deformation. An experimental campaign, where Kolsky (split Hopkinson) pressure bar tests were combined with in situ infrared temperature measurements, was conducted on OFHC copper compression specimens. The analytical thermomechanical conversion was compared with the experimental one, revealing a significant discrepancy between the two. An empirical ad hoc factor was introduced in the analytical expression in order to describe adequately the thermomechanical response of the material under dynamic (impact) loading conditions.
引用
收藏
页码：55 / 69
页数：15
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