Effect of Aggregate on Asphalt Mixture Cracking Using Time-Dependent Fracture Mechanics Approach

2009 ◽  
pp. 281-281-14 ◽  
Author(s):  
O Abdulshafi
Keyword(s):  
Fracture Mechanics ◽  
Asphalt Mixture ◽  
Time Dependent

Mixed-Mode Fracture Criteria for Reliability Analysis and Design With Structural Ceramics

1987 ◽  
Vol 109 (3) ◽  
pp. 282-289 ◽  
Author(s):  
D. K. Shetty
Keyword(s):  
Fracture Mechanics ◽  
Reliability Analysis ◽  
Mixed Mode ◽  
Linear Elastic Fracture Mechanics ◽  
Time Dependent ◽  
Mixed Mode Fracture ◽  
Fracture Criteria ◽  
Mode Fracture ◽  
Linear Elastic ◽  
Elastic Fracture

Increasing use of ceramics in structural applications has led to the development of a probabilistic design methodology that combines three elements: linear elastic fracture mechanics theory that relates strengths of ceramics to size, shape, and orientation of critical flaws, a characteristic flaw size distribution function that accounts for the size effect on strength via the weakest-link concept, and a time-dependent strength caused by subcritical crack growth or other mechanisms. This paper reviews recent research that has been focused on the first of the above three elements, the investigation of fracture criteria for arbitrarily oriented flaws in ceramics, i.e., the mixed-mode fracture problem in linear elastic fracture mechanics theory. Experimental results obtained with two-dimensional through cracks and three-dimensional surface (indentation) cracks are summarized and compared to mixed-mode fracture criteria. The effects of material microstructure and the stress state on mixed-mode fractures are discussed. The application of mixed-mode fracture criteria in reliability analysis is illustrated for several simple stress states in the absence of time-dependent strength degradation.

Considering Material Heterogeneity in Crack Modeling of Asphaltic Mixtures

2003 ◽  
Vol 1832 (1) ◽  
pp. 113-120 ◽  
Author(s):  
Jorge Barbosa Soares ◽  
Felipe Araújo Colares de Freitas ◽  
David H. Allen
Keyword(s):  
Fracture Mechanics ◽  
Numerical Method ◽  
Laboratory Tests ◽  
Global Analysis ◽  
Asphalt Mixture ◽  
Local Scale ◽  
Monotonic Loading ◽  
Crack Evolution ◽  
Material Heterogeneity

Cracking in the asphaltic layer of pavement has been shown to be a major source of distress in roadways. Previous studies in asphaltic mixture cracking have typically not considered the material heterogeneity. A numerical method of analysis is presented that is based on the theory of fracture mechanics, in which the binder and the aggregates are treated as distinct materials. The simulations performed are verified and calibrated from simple and conventional laboratory tests. The study investigates crack evolution under monotonic loading, even though the method outlined can be further developed for the investigation of asphalt mixture fatigue. The approach discussed is part of a multiscale framework for pavement analysis, in which the damage due to cracking at the local scale can be considered in a global analysis at the actual pavement scale.

scholarly journals Evaluation of Time-Dependent Fracture Mechanics Parameters of a Moving Crack in a Viscoelastic Strip.

1999 ◽  
Vol 42 (4) ◽  
pp. 624-630 ◽  
Author(s):  
Satoru YONEYAMA ◽  
Kazuo OGAWA ◽  
Akihiro MISAWA ◽  
Masahisa TAKASHI
Keyword(s):  
Fracture Mechanics ◽  
Time Dependent ◽  
Moving Crack ◽  
Viscoelastic Strip

Solvent-induced damage in polyimide thin films

1991 ◽  
Vol 6 (6) ◽  
pp. 1374-1383 ◽  
Author(s):  
M.S. Hu ◽  
M.Y. He ◽  
A.G. Evans
Keyword(s):  
Thin Films ◽  
Fracture Mechanics ◽  
Exposure Time ◽  
Time Dependent ◽  
Solvent Exposure

Solvent induced crazes formed in strained polyimide thin films on different substrates have been studied. A fracture mechanics approach has been used to simulate craze evolution. The experiments and simulations have identified a critical prestrain below which craze formation does not occur. This strain decreases with increase in solvent exposure time, but also exhibits a threshold. Diffusion of the solvent into the film is considered to be responsible for the time-dependent nature of damage formation.

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