Fracture Characteristics of Asphalt Concrete in Mixed-Loading Mode at Low-Temperature Based on Discrete-Element Method

2018 ◽  
Vol 30 (12) ◽  
pp. 04018321 ◽  
Author(s):  
Lu Sun ◽  
Jiaolong Ren ◽  
Shiyi Zhang
Keyword(s):  
Low Temperature ◽  
Discrete Element Method ◽  
Asphalt Concrete ◽  
Discrete Element ◽  
Fracture Characteristics ◽  
Loading Mode ◽  
Element Method

Modeling of Asphalt Concrete Fracture Tests with the Discrete-Element Method

2020 ◽  
Vol 32 (8) ◽  
pp. 04020228 ◽  
Author(s):  
Juliana Meza-Lopez ◽  
Nilthson Noreña ◽  
Carlos Meza ◽  
Celso Romanel
Keyword(s):  
Discrete Element Method ◽  
Asphalt Concrete ◽  
Discrete Element ◽  
Concrete Fracture ◽  
Fracture Tests ◽  
Element Method

Rate-dependent fracture modeling of asphalt concrete using the discrete element method

2009 ◽  
Vol 36 (2) ◽  
pp. 320-330 ◽  
Author(s):  
Hyunwook Kim ◽  
Michael P. Wagoner ◽  
William G. Buttlar
Keyword(s):  
Discrete Element Method ◽  
Asphalt Concrete ◽  
Cohesive Zone Model ◽  
Discrete Element ◽  
Fracture Mechanisms ◽  
Zone Model ◽  
Rate Dependency ◽  
Heterogeneous Model ◽  
Rate Dependent ◽  
Element Method

The discrete element method (DEM) represents a convenient and powerful tool for studying effects of material microstructure on fracture mechanisms in asphalt concrete. In this paper, the rate-dependency of asphalt concrete is investigated using a cohesive zone model with bulk viscoelastic properties combined with bilinear post-peak softening. Details of the constitutive models implemented in the DEM, with particular emphasis on the verification of viscoelastic models, are presented. Experimental test results based on a disk-shaped compact tension test are obtained under different loading rates and those are compared to numerical simulations with the help of the rate-dependent model. Homogeneous and heterogeneous model results are compared, where heterogeneous models are constructed to consider aggregate morphology for particles larger than 1.18 mm. The relative importance of time-dependence and the consideration of material heterogeneity in the simulation of monotonic Mode I fracture tests are demonstrated.

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