Predicting Viscoelastic Response and Crack Growth in Asphalt Mixtures with the Boundary Element Method

2002 ◽  
Vol 1789 (1) ◽  
pp. 129-135 ◽  
Author(s):  
Bjorn Birgisson ◽  
Boonchai Sangpetngam ◽  
Reynaldo Roque
Keyword(s):  
Boundary Element Method ◽  
Boundary Element ◽  
Crack Growth ◽  
Asphalt Mixtures ◽  
Viscoelastic Response ◽  
Element Method

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.

scholarly journals Fatigue Life Prediction of the Zirconia Fixture Based on Boundary Element Method

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Y. W. Wang ◽  
J. J. Ye ◽  
W. P. He ◽  
G. G. Cai ◽  
B. Q. Shi
Keyword(s):  
Fatigue Life ◽  
Boundary Element Method ◽  
Boundary Element ◽  
Crack Growth ◽  
Semiconductor Industry ◽  
Element Model ◽  
Stress Distributions ◽  
Paris Law ◽  
Initial Cracks ◽  
Element Method

Zirconia grinding fixtures have been widely used in semiconductor industry to improve the quality and precision of the products. For maximizing the service life and minimizing the risks of accidental damage, it is critical to have a better understanding of the fatigue life of zirconia grinding fixtures. To this end, a boundary element method is developed in this paper to investigate their crack growth and fatigue life. To validate the proposed method, the stress intensity factor of a typical plate structure with initial cracks is considered. On this basis, Paris Law is employed in the boundary element model to further study the crack growth and stress distributions in the zirconia fixture under cyclic loads. Numerical results show that stress concentration occurs at the pillar of the fixture, and crack growth is perpendicular to the loading direction.

scholarly journals Fracture Characteristics Analysis of Pressured Pipeline with Crack Using Boundary Element Method

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Han-Sung Huang
Keyword(s):  
Boundary Element Method ◽  
Service Life ◽  
Boundary Element ◽  
Crack Growth ◽  
Longitudinal Crack ◽  
Fatigue Loading ◽  
Longitudinal Direction ◽  
Uniform Corrosion ◽  
Loading Cycle ◽  
Element Method

Metal materials can inevitably show deteriorated properties by the factors of stress, temperature, and environmental erosion in distinct operating environments. Without proper protection, the service life would be shortened or even deadly danger would be caused. This study aims to apply Finite Element Method and Boundary Element Method to analyzing the effects of corroded petrochemical pipes on the fatigue life and the fracture form. The research results of nondestructive testing and software analyses show that cracked oil pipes with uniform corrosion bear larger stress, mainly internal pressure, on the longitudinal direction than the circumferential direction. As a result, the maximal fatigue loading cycle of a circumferential crack is higher than that of a longitudinal one. From the growing length and depth of a crack, the final aspect ratio of crack growth appears in 2.42–3.37 and 2.71–3.42 on the circumferential and longitudinal direction, respectively. Meanwhile, the ratios of loading cycles of circumferential and longitudinal crack are 26.23 on uncorroded and 20.54 on general metal loss oil pipe. The complete crack growth and the correspondent fatigue loading cycle could be acquired to determine the service life of the oil pipe being operated as well as the successive recovery time.

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