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首页> 外文期刊>International Journal of Plasticity >On a dislocation-based constitutive model and dynamic thermomechanical considerations
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On a dislocation-based constitutive model and dynamic thermomechanical considerations

机译：基于错位的本构模型和动态热机理考虑因素

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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.
机译：基于错位的本构型模型被广泛用于预测金属材料的塑性行为，在准静态和动态条件下。另外，如果已知（绝热）热机械（塑料工作）的比例是已知的，则可以估计应力 - 应变 - 温度关系。本研究的主要目的是验证广泛使用的表达式的适用性（塑性变形材料的应变能量与位错的密度成比例）以计算材料中的储存能量，该能量可以并联使用利用微机械模型来估算动态塑性变形期间的温度升高。在OFHC铜压缩样本上进行了一种实验活动，其中Kolsky（分裂霍普金森）压力杆试验与原位红外线温度测量相结合。将分析热机械转化与实验性的转换进行比较，揭示了两者之间的显着差异。在分析表达中引入了经验性临时因子，以适当描述在动态（冲击）负载条件下材料的热机械响应。

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