We present a thermodynamic description of crystal plasticity. Our formulation is based on the Langer-Bouchbinder-Lookman thermodynamic dislocation theory (TDT), which asserts the fundamental importance of an effective temperature that describes the state of configurational disorder and therefore the dislocation density of the crystalline material. We extend the TDT description from isotropic plasticity to crystal plasticity with many slip systems. Finite-element simulations show favourable comparison with experiments on polycrystal fcc copper under uniaxial compression, tension, and simple shear. The thermodynamic theory of crystal plasticity thus provides a thermodynamically consistent and physically rigorous description of dislocation motion in crystals. We also discuss new insights about the interaction of dislocations belonging to different slip systems.

我们提出了晶体可塑性的热力学描述。我们的公式是基于Langer-Bouchbinder-Lookman热力学位错理论（TDT）提出的，该理论断言有效温度的基本重要性，有效温度描述了构型无序状态，从而描述了晶体材料的位错密度。我们将TDT的描述从各向同性可塑性扩展到具有许多滑移系统的晶体可塑性。有限元模拟显示了与多晶fcc铜在单轴压缩，拉伸和简单剪切作用下进行的实验的有利比较。因此，晶体可塑性的热力学理论提供了晶体中位错运动的热力学一致性和物理上严格的描述。