金属中的热机械转换：泰勒-昆尼系数的位错塑性模型估算
Thermomechanical conversion in metals: dislocation plasticity model evaluation of the Taylor-Quinney coefficient
摘要：
使用一个分配能量的热力学框架，分配能量的原子构型储存能量的冷加工和动力学振动，我们推导出一个重要的约束泰勒-昆尼系数，量化的分数，塑性变形塑性形变过程中转化为热量的工作。与这两种能量贡献相关联的是两个独立的温度--热能的常温和构型能的有效温度。我们表明，泰勒-昆尼系数是一个函数的物理定义的有效温度，测量的原子在材料中的构型无序。最近发表的铝合金6016-T4 \citep{neto_2020}的实验，使用热力学位错理论（TDT）的元素分析，显示出良好的一致性理论和实验的应力-应变行为和温度的时间演变。模拟包括实验期间的传导和对流热能损失，并且在模拟结果内存在显著的热梯度。微分泰勒-昆尼系数的计算值也提出，并建议一个值，不同的材料和增加应变。
英文摘要：
Using a partitioned-energy thermodynamic framework which assigns energy to that of atomic configurational stored energy of cold work and kinetic-vibrational, we derive an important constraint on the Taylor-Quinney coefficient, which quantifies the fraction of plastic work that is converted into heat during plastic deformation. Associated with the two energy contributions are two separate temperatures -- the ordinary temperature for the thermal energy and the effective temperature for the configurational energy. We show that the Taylor-Quinney coefficient is a function of the thermodynamically defined effective temperature that measures the atomic configurational disorder in the material. Finite-element analysis of recently published experiments on the aluminum alloy 6016-T4 \citep{neto_2020}, using the thermodynamic dislocation theory (TDT), shows good agreement between theory and experiment for both stress-strain behavior and temporal evolution of the temperature. The simulations include both conductive and convective thermal energy loss during the experiments, and significant thermal gradients exist within the simulation results. Computed values of the differential Taylor-Quinney coefficient are also presented and suggest a value which differs between materials and increases with increasing strain.
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