Application of thermomechanical principles to the modelling of geotechnical materials
Application of thermomechanical principles to the modelling of geotechnical materials
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DOI：
10.1098/rspa.1997.0107
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发表时间：
1997-09-08
影响因子：
3.5
通讯作者：
Houlsby, GT
中科院分区：
文献类型：
--
作者：
Collins, IF;Houlsby, GT
提出了用于岩土材料塑性建模的热力学框架。该框架能够对摩擦和非关联流进行严格建模，并证明了这些现象之间的紧密联系。该公式集中于根据关于能量势和耗散函数的形式的假设来开发本构模型。人们发现，将之前使用亥姆霍兹自由能的工作重新表述为从吉布斯自由能开始的新方法是有价值的。论证了新函数和经典塑性概念（屈服面、塑性势、各向同性和运动硬化、摩擦、膨胀）之间的关系。对弹塑性联轴器进行了评论。讨论了临界状态土壤模型新方法的含义。
A thermodynamic framework is presented for the plasticity modelling of geotechnical materials. The framework is capable of modelling rigorously both friction and non-associated flow, and the strong connection between these phenomena is demonstrated. The formulation concentrates on the development of constitutive models from hypotheses about the form of an energy potential and a dissipation function. The reformulation of previous work, in which the Helmholtz free energy was used, to a new approach starting from the Gibbs free energy is found to be valuable. The relationship between the new functions and classical plasticity concepts (yield surface, plastic potential, isotropic and kinematic hardening, friction, dilation) is demonstrated. Comments are made on elastic-plastic coupling. Implications of the new approach for critical state soil models are discussed.