Mathematical formulation of HMA crack initiation and crack propagation models based on continuum fracture-mechanics and work-potential theory
Mathematical formulation of HMA crack initiation and crack propagation models based on continuum fracture-mechanics and work-potential theory
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DOI：
10.1016/j.ijfatigue.2011.12.020
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发表时间：
2012-07-01
影响因子：
6
通讯作者：
Sanabria, Luis E.
中科院分区：
文献类型：
--
作者：
Walubita, Lubinda F.;Simate, Geoffrey S.;Sanabria, Luis E.
断裂损伤引起的疲劳开裂是当今热拌沥青路面普遍存在的主要结构病害之一。HMA抗裂性由两个基本机制决定：微裂纹在裂纹萌生过程中聚合成宏观裂纹的重复加载循环次数(NO)和在裂纹扩展过程中宏观裂纹通过HMA层厚度扩展的重复加载循环次数(NO)。要充分模拟HMA的断裂抗力，必须了解这两个过程的基本机制。在本研究中，基于连续介质断裂力学、功势理论、拟应变能和表面能的概念，建立了计算N-I和N-P的数学模型。对基于实验室测试数据的模型进行了验证和敏感性分析，并与传统的德克萨斯州HMA混合物进行了比较，得出了可信的结果。总体而言，所建立的模型被发现作为定量表征HMA混合料的断裂和疲劳抗裂性的基本手段具有潜在的前景。然而，强烈建议对含有更多HMA混合物和现场数据的模型进行验证和校准。爱思唯尔有限公司出版。
Fatigue cracking due to fracture damage is one of the major structural distresses prevalent in today's hot-mix asphalt (HMA) pavements. HMA resistance to fracture is governed by two fundamental mechanisms: the number of repetitive load cycles for microcracks to coalesce into macrocracks in a crack initiation process (NO and the number of repetitive load cycles for macrocrack propagation through the HMA layer thickness in a crack propagation process (No). To adequately model HMA fracture resistance, the fundamental mechanisms of these two processes must be understood. In this study, mathematical models for computing N-i and N-p were formulated based on continuum fracture-mechanics, the work potential theory, and pseudo-strain energy and surface energy concepts. Verification and sensitivity analysis of the models based on laboratory test data, with traditional Texas HMA mixes, yielded plausible results. Overall, the formulated models were found to be potentially promising as a fundamental means to quantitatively characterize the fracture and fatigue cracking resistance of HMA mixes. However, validation and calibration of the models with more HMA mixes and field data is strongly recommended. Published by Elsevier Ltd.