Fracture failure in crack interaction of asphalt binder by using a phase field approach

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• 作者：Yue Hou ; Linbing Wang ; Pengtao Yue ; Wenjuan Sun
• 关键词：Crack interaction ; Phase field ; Self ; adaptive meshing ; Asphalt binder ; Experiment
• 刊名：Materials and Structures
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：48
• 期：9
• 页码：2997-3008
• 全文大小：1,322 KB
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• 作者单位：Yue Hou (1)
  Linbing Wang (2)
  Pengtao Yue (3)
  Wenjuan Sun (1)
  
  1. Virginia Polytechnic Institute and State University, Blacksburg, VA, 24061, USA
  2. The Via Department of Civil and Environmental Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA, 24061, USA
  3. Department of Mathematics, Virginia Polytechnic Institute and State University, Blacksburg, VA, 24061, USA
  
• 刊物类别：Engineering
• 刊物主题：Structural Mechanics
  Theoretical and Applied Mechanics
  Mechanical Engineering
  Operating Procedures and Materials Treatment
  Civil Engineering
  Building Materials
  
• 出版者：Springer Netherlands
• ISSN：1871-6873

文摘

Fracture failure in crack interaction of asphalt binder has always been one serious problem in the pavement industry. In the state of the art research of asphalt cracking, single mode cracking has been studied by many researchers but there lacks theoretical and experimental research on the crack interaction of asphalt binder, which is more reasonable and realistic. The traditional way is to use the Griffith’s theory which is complex and complicated. In this paper, the phase field method (PFM) is presented for modeling, which describes the whole cracking system using a phase-field variable that assumes negative one in the void region (crack) and positive one in the solid region (intact). The fracture toughness is then considered as a material property and modeled as the surface energy stored in the diffuse interface between the intact solid and crack void. The non-conserved Allen–Cahn equation is adopted as the system governing equation to evolve the phase field variable to account for the growth of cracks. The energy based formulation of the phase-field method handles the competition between the growth of surface energy and release of elastic energy of crack interaction in a natural way: the crack propagation is a result of the energy minimization in the direction of the steepest descent. Both the linear elasticity and phase-field equation are solved in a unified finite element frame work, which is implemented in the commercial software COMSOL. Two cracking experiments, namely, direct tension test and double edge notch tension test are then performed for validation. It is discovered that the critical load of crack interaction by PFM agrees very well with both experiment results.