Coupled Viscoplasticity Damage Constitutive Model for Concrete Materials
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摘要: 基于不可逆热力学,引入运动硬化、等向硬化和损伤内变量,构造了相应的自由能函数和流动势函数,推导出了混凝土材料的粘塑性损伤本构模型.数值模拟的结果表明,该模型能够避开屈服面和破坏准则的基本假设来描述混凝土材料的以下特性:压缩载荷作用下的体积膨胀现象;应变率敏感性;峰值后由损伤和破坏引起的应力软化和刚度退化现象A·D2由于此模型避开了根据各种变形阶段选择与其相应的本构模型的繁琐计算,因此更便于纳入复杂工况下应力分析有限元程序中.Abstract: Coupled viscoplasticity damage constitutive model for concrete materials is developed within the framework of irreversible thermodynamics, and simultaneously the Helmholtz free energy function and a non-associated flow potential function are given, which include the internal variables of kinematic hardening, isotropic hardening and damage. Results from numerical simulation show that the model presented can describe the deformation properties of the concrete without the formal hypotheses of yield criterion and failure criteria, such as that volume dilatancy under compression; strain-rate sensitivity; stiffness degradation and stress-softening behavior beyond the peak stress which are brought by damages and fractures. Moreover, we could benefit from the application of finite element method based on this model under complex loading because of avoiding the choice of different constitutive model based on the deformation level.
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Key words:
- concrete /
- viscoplasticity /
- damage /
- irreversible thermodynamics
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