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Computational Constitutive Model for Predicting Nonlinear Viscoelastic Damage and Fracture Failure of Asphalt Concrete Mixtures

机译:沥青混凝土混合料非线性粘弹性损伤与断裂破坏预测的计算本构模型

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摘要

A computational constitutive model was developed to predict damage and fracture failure of asphalt concrete mixtures. Complex heterogeneity and inelastic mechanical behavior are addressed by the model by using finite-element methods and elastic– viscoelastic constitutive relations. Damage evolution due to progressive cracking is represented by randomly oriented interface fracture, which is governed by a newly developed nonlinear viscoelastic cohesive zone model. Computational simulations demonstrate that damage evolution and failure of asphalt concrete mixtures is dependent on the mechanical properties of the mixture. This approach is suitable for the relative evaluation of asphalt concrete mixtures by simply employing material properties and fracture properties of mixture components rather than by performing expensive laboratory tests recursively, which are typically required for continuum damage mechanics modeling.
机译:建立了计算本构模型以预测沥青混凝土混合物的破坏和断裂破坏。该模型通过使用有限元方法和弹性-粘弹性本构关系来解决复杂的异质性和非弹性力学行为。渐进性开裂引起的损伤演化以随机取向的界面断裂为代表,这由新开发的非线性粘弹性内聚力区模型控制。计算仿真表明,沥青混凝土混合物的破坏演化和破坏取决于混合物的机械性能。通过简单地使用混合物组分的材料特性和断裂特性,而不是通过递归执行昂贵的实验室测试(这是连续损伤力学建模通常需要的),该方法适用于沥青混凝土混合物的相对评估。

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