Energy-based mechanistic approach for crack growth characterization of asphalt binder

Abstract

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Stochastic fatigue damage in viscoelastic materials using probabilistic pseudo J-integral Paris' law

“…In this study, the EBM approach can be applied to determine a damage evolution model for asphalt binders. A torque equilibrium principle and two energy balance principles are listed as follows [36][37]:…”

A kinetics-based model of fatigue crack growth rate in bituminous material

“…When the destructive time sweep test is carried out on the bituminous materials, fatigue cracks gradually generate and expand to the loading center of the sample with the increase of loading cycle [20][21]. In this study, the entire bituminous material sample containing edge fatigue crack is defined as the apparent material, while the central nondestructive material without edge crack is defined as the intact material.…”

“…( 13), ( 14), (15). The true radius r T of bituminous materials can be obtained when performing the controlled-strain shear fatigue test [20]:…”

“…The surface of bituminous materials showed different characteristics at different areas after performing the time sweep test under high oscillation shear strain levels, and an image processing approach was performed to validate Eqs ( 16) and ( 17) in our previous study [20].…”

“…However, in these studies, the fatigue crack length under the destructive condition was derived based on the linear viscoelastic constitutive equation under the nondestructive condition, which makes the calculation results inaccurate. Hence, to better understand the fatigue mechanisms, the authors proposed a fatigue crack length model for bituminous materials based on the torque and dissipated strain energy equilibrium principles, and the fatigue crack length model was investigated by the image process method [20][21].…”