A novel thermo-elastoplastic self-consistent homogenization model for granular materials that exhibit inter-granular plasticity is presented. The model, TEPSCA, is made possible by identifying a new inter-granular plastic Eshelby-like tensor. A micromechanical model of interfacial yielding between grains of a Mohr–Coulomb type is provided, which is relatable to the description of imperfect interfaces within the paradigm of self-consistent homogenization. The local grain constitutive laws are consistent with the description of an interphase layer comprised of local pore volume between grains, such that inelastic inter-particle displacements are directly relatable to changes in bulk porosity, i.e., dilation. The model was developed for the purpose of modeling thermally induced plasticity—the phenomenon known as thermal ratcheting or “ratchet growth”—of composites made from the high explosive triaminotrinitrobenzene (TATB). Model simulations are compared to ratchet growth measurements during cyclic thermal loading of a TATB pellet under stress-free conditions.

中文翻译：

---

粒间塑性的热弹自洽均质化方法及其在TATB热棘轮中的应用

提出了一种新型的颗粒间可塑性的热弹塑性自洽均质化模型。通过识别新的粒间塑性埃舍尔比样张量，使TEPSCA模型成为可能。提供了Mohr-Coulomb型晶粒之间的界面屈服的微力学模型，它与自洽均质化范式中不完善的界面的描述有关。局部晶粒本构定律与由晶粒之间的局部孔体积组成的相间层的描述相一致，使得非弹性颗粒间位移直接与体孔隙率的变化（即膨胀）有关。开发该模型的目的是为了模拟由高爆炸性三氨基三硝基苯（TATB）制成的复合材料的热诱导塑性（一种称为热棘齿或“棘齿生长”的现象）。将模型模拟与TATB颗粒在无应力条件下进行循环热加载期间的棘轮生长测量进行了比较。