期刊
ENGINEERING FRACTURE MECHANICS
卷 92, 期 -, 页码 40-55出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2012.05.016
关键词
Asphalt mixture; Tensile fracture simulation; Aggregate generation and packing algorithm; Heterogeneous mesostructures; Bilinear softening law
类别
资金
- National Natural Science Foundation of China [10872073]
- National Basic Research Program of China (973 Program) [2011CB013800]
A heterogeneous fracture modeling technology is presented to simulate complex two-dimensional crack propagation in asphalt mixture which is treated as composites consisting of randomly distributed coarse aggregates and asphalt mastic. In this technology, the random aggregate generation and packing algorithm is utilized to create numerical asphalt mixture samples with heterogeneous mesostructures, and cohesive elements with the bilinear softening law are inserted into both the mastic and the interfaces between the mastic and aggregates to simulate crack initiation and propagation. After mesh-dependence of computational results is discussed, a series of virtual uniaxial tensile fracture tests are performed at -10 degrees C to study nucleation and coalescence of microcracks, and gestation and propagation of main macrocracks. The effects of aggregate distribution and main parameters of the cohesive crack model on the performance of asphalt mixture are also evaluated. Some important conclusions are given. (C) 2012 Elsevier Ltd. All rights reserved.
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