Two-Stage Viscoelastic-Viscoplastic Damage Constitutive Model of Asphalt Mixtures
Two-Stage Viscoelastic-Viscoplastic Damage Constitutive Model of Asphalt Mixtures
复制标题
沥青混合料两阶段粘弹粘塑性损伤本构模型
DOI：
10.1061/(asce)mt.1943-5533.0000646
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发表时间：
2013-08-01
影响因子：
3.2
通讯作者：
Zhu, Yaoting
中科院分区：
文献类型：
--
作者：
Sun, Lu;Zhu, Haoran;Zhu, Yaoting
摘要 建立了两阶段粘弹粘塑性损伤本构模型来描述沥青混合料在不同载荷条件下的不同机械变形响应。该模型将总应变分解为粘弹性和粘塑性分量，并考虑了损坏。分别使用粘弹性参数的蠕变恢复试验和粘塑性参数的静态三轴蠕变试验来校准模型。然后使用三轴恒应变率压缩试验验证校准的本构模型。计算的体积变形表现出模型的粘弹性分量引起的初始收缩，随后是粘塑性损伤分量引起的膨胀，这与实验现象一致。结果表明，该模型能够合理地表征蠕变试验的三阶段变形以及等应变率压缩试验的硬化和软化阶段。
AbstractA two-stage viscoelastic-viscoplastic damage constitutive model is developed for describing different mechanical deformation response of asphalt mixtures under various loading conditions. The model decomposes total strain into viscoelastic and viscoplastic components with damage considered. The model is calibrated using the creep-recovery test for viscoelastic parameters and using the static triaxial creep test for viscoplastic parameters, respectively. The calibrated constitutive model is then validated using triaxial constant strain rate compression tests. The calculated volumetric deformation exhibits initial contraction caused by viscoelastic component of the model, followed by dilation caused by the viscoplastic damage component, which is consistent with the experimental phenomena. Results show that the model can reasonably represent the three-stage deformation of creep test as well as the hardening and softening stages of constant strain rate compression test.