A Phenomenological Fatigue Performance Model of Asphalt Mixtures Based on Fracture Energy Density

2014 ◽  
Vol 43 (1) ◽  
pp. 20130057 ◽  
Author(s):  
A. M. Bahadori ◽  
A. Mansourkhaki ◽  
M. Ameri
Keyword(s):  
Energy Density ◽  
Fracture Energy ◽  
Performance Model ◽  
Asphalt Mixtures ◽  
Fatigue Performance

Simulation of Fracture Initiation in Hot-Mix Asphalt Mixtures

2003 ◽  
Vol 1849 (1) ◽  
pp. 183-190 ◽  
Author(s):  
Bjorn Birgisson ◽  
Chote Soranakom ◽  
John A. L. Napier ◽  
Reynaldo Roque
Keyword(s):  
Tensile Strength ◽  
Boundary Element Method ◽  
Energy Density ◽  
Fracture Energy ◽  
Boundary Element ◽  
Fracture Initiation ◽  
Asphalt Mixtures ◽  
Displacement Discontinuity ◽  
Cracking Behavior ◽  
Element Method

A displacement discontinuity boundary element method is presented to explicitly model the microstructure of asphalt mixtures and to predict their tensile strength and fracture energy density. The loading response of three mixtures was simulated to assess the mechanics of fracture in the Superpave indirect tension test. The predicted tensile strength and fracture energy density of three samples were comparable with the test results for the samples. The predicted crack initiation and crack propagation patterns are consistent with observed cracking behavior. The results also imply that fracture in mixtures can be modeled effectively using a micromechanical approach that allows for crack growth both along aggregate surfaces and through the aggregates. Finally, the nonlinear Mohr–Coulomb type of failure envelope used to model the mastic appears to result in reasonable predictions. It can be concluded that the explicit fracture modeling with the displacement discontinuity boundary element method has the potential to evaluate the mechanics of fracture in asphalt mixtures.

Fracture energy density of interstitial component of asphalt mixtures

2018 ◽  
Vol 51 (5) ◽  
Author(s):  
Yu Yan ◽  
Francesco Preti ◽  
Elena Romeo ◽  
George Lopp ◽  
Gabriele Tebaldi ◽  
...  
Keyword(s):  
Energy Density ◽  
Fracture Energy ◽  
Asphalt Mixtures ◽  
Interstitial Component

Extrapolation of Creep Strength by Fracture Energy for 316FR Stainless Steel at 823K

2013 ◽  
Author(s):  
Yuji Nagae ◽  
Tai Asayama
Keyword(s):  
Stainless Steel ◽  
Energy Density ◽  
Fracture Energy ◽  
Creep Strength ◽  
Stress Rupture ◽  
Energy Approach ◽  
Time To Failure ◽  
Design Life ◽  
Time To Rupture ◽  
Density Rate

316FR stainless steel is a candidate material to be used for a reactor vessel and internals for fast reactors with a design life of 60 years at an operating temperature of 823K. This paper describes an extrapolation approach based on fracture energy for calculating creep strength. A change in fracture energy is assumed to be expressed as a power-law function of time to failure and energy density rate. The energy density rate is calculated using initial stress, rupture elongation, and time to rupture. It is important to evaluate a change in rupture elongation for the extrapolation of creep strength at 823K. The time to rupture at 823K is estimated and extrapolated on the basis of the fracture energy approach. This paper shows the validity of extending the design life to 60 years by using the Larson–Miller parameter compared with the estimation by the fracture energy approach.

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