One of the major distresses that directly affects the serviceability and quality of flexible pavement structures is cracking, which may occur in various forms such as longitudinal, transverse, and a combination of both that can extend over the width of the pavement to create hazardous conditions for the road users. Fracture energy is one of the most significant parameters used in evaluating the potential for cracking to occur in an asphalt material. The fundamental principles of fracture mechanics illustrate that the crack initiates at the vicinity of the crack tip, if the energy stored near it exceeds the cracking resistance (Gauthier, G., & D. A. Anderson 2006). Researchers have performed laboratory tests such as disc shaped compaction, indirect diametral tensile, single edged notched beam, and semicircular bending (SCB) test to investigate the cracking problem in asphalt mixtures, particularly to study crack resistance and fracture. It is noteworthy that SCB test is popular due to simplicity in testing, repeatability, and ease of data processing (Nsengiyumva 2015). Numerical studies using the finite element method (FEM) have been used to evaluate cracking in pavements with complex microscopic morphology in order to compute the fracture parameters such as stress intensity factor, fracture energy and crack length, which govern crack propagation. However, modeling the crack propagation mechanism is difficult through FEM since the mesh does not align with the direction of crack propagation, thus, requiring remeshing of the geometry for every load step. As a solution, Extended Finite Element Method (XFEM) was developed, which is an improvement over FEM that involves the concepts of fracture mechanics to estimate the crack growth (Yazid et al. 2009).

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Model Updating Strategy for Asphalt Mix Material Parameter Identification Using Static Semi-circular Bending Test

  • Surya Marimuthu,
  • B. Radhika,
  • Krishna Prapoorna Biligiri

摘要

One of the major distresses that directly affects the serviceability and quality of flexible pavement structures is cracking, which may occur in various forms such as longitudinal, transverse, and a combination of both that can extend over the width of the pavement to create hazardous conditions for the road users. Fracture energy is one of the most significant parameters used in evaluating the potential for cracking to occur in an asphalt material. The fundamental principles of fracture mechanics illustrate that the crack initiates at the vicinity of the crack tip, if the energy stored near it exceeds the cracking resistance (Gauthier, G., & D. A. Anderson 2006). Researchers have performed laboratory tests such as disc shaped compaction, indirect diametral tensile, single edged notched beam, and semicircular bending (SCB) test to investigate the cracking problem in asphalt mixtures, particularly to study crack resistance and fracture. It is noteworthy that SCB test is popular due to simplicity in testing, repeatability, and ease of data processing (Nsengiyumva 2015). Numerical studies using the finite element method (FEM) have been used to evaluate cracking in pavements with complex microscopic morphology in order to compute the fracture parameters such as stress intensity factor, fracture energy and crack length, which govern crack propagation. However, modeling the crack propagation mechanism is difficult through FEM since the mesh does not align with the direction of crack propagation, thus, requiring remeshing of the geometry for every load step. As a solution, Extended Finite Element Method (XFEM) was developed, which is an improvement over FEM that involves the concepts of fracture mechanics to estimate the crack growth (Yazid et al. 2009).