Crack Propagation Simulation for Epoxy Asphalt Concrete Pavement

2011 ◽  
Vol 460-461 ◽  
pp. 698-703 ◽  
Author(s):  
Sang Luo ◽  
Zhen Dong Qian ◽  
Chun Chen
Keyword(s):  
Crack Initiation ◽  
Crack Propagation ◽  
Asphalt Concrete ◽  
Crack Tip ◽  
Concrete Pavement ◽  
J Integral ◽  
Epoxy Asphalt ◽  
Initiation And Propagation ◽  
Asphalt Concrete Pavement ◽  
Epoxy Asphalt Concrete

Crack is one of the major distresses in asphalt pavement. Although epoxy asphalt concrete demonstrates higher distress resistant ability than traditional asphalt concrete, crack initiation and propagation is also inevitable due to traffic and environmental impact. Among the three typical crack modes, the Mode I crack usually appears in epoxy asphalt concrete pavement. In this paper, the model of crack propagation in epoxy asphalt concrete pavement is proposed and simulated through finite element method in conjunction with virtual crack extension approach. The eight-node singularity element was used at the crack-tip. And the node shift/release technique is adopted for modeling propagation of the crack tip. Results show that J-integral is path-independent due to the small plastic zone around the crack tip and suitable to evaluate the fracture behavior for epoxy asphalt concrete pavement. Two inflexions on the curve of J-integral vs. crack length indicate that epoxy asphalt concrete pavement have three phases in crack initiation and propagation: crack initiation, stable crack propagation and unstable crack propagation. Finally, the equation describing the relationship between J-integral and displacement is provided in this paper.

On the Topology Update of the Numerical Manifold Method for Multiple Crack Propagation

2021 ◽  
pp. 2150030
Author(s):  
Jun He ◽  
Shuling Huang ◽  
Xiuli Ding ◽  
Yuting Zhang ◽  
Dengxue Liu
Keyword(s):  
Crack Initiation ◽  
Crack Propagation ◽  
Numerical Method ◽  
Crack Tip ◽  
Search Method ◽  
Numerical Manifold Method ◽  
Crack Initiation And Propagation ◽  
Multiple Crack ◽  
Initiation And Propagation ◽  
Numerical Manifold

Crack initiation and propagation are the two key issues of concern in the geotechnical engineering. In this study, the numerical manifold method (NMM) is applied to simulate crack propagation and the topology update of the NMM for multiple crack propagation is studied. The crack-tip asymptotic interpolation function is incorporated into the NMM to increase the accuracy of the crack-tip stress field. In addition, the Mohr-Coulomb criterion with tensile cut off is adopted to be the crack propagation criterion to judge the direction of crack initiation and propagation. Then a crack tip searching method is developed to automatically update the position of the crack tips. The inapplicability of the original loop search method in the NMM is also illustrated and a novel loop search method based on manifold elements is developed for physical loop updating. Moreover, methods for the manifold element updating and physical cover updating are provided. Based on the above study, the developed numerical method is capable to simulate multiple crack propagation. At last, typical rock rupture problems are numerically simulated to manifest the effectiveness of the developed numerical method.

scholarly journals First Steps of Crack Initiation and Propagation in Fatigue of FCC Crystals Studied by Dislocation Dynamics

2012 ◽  
Author(s):  
C. Déprés ◽  
G. V. Prasad Reddy ◽  
L. Tabourot ◽  
R. Sandhya ◽  
S. Sankaran
Keyword(s):  
Stress Field ◽  
Crack Initiation ◽  
Crack Propagation ◽  
Fatigue Crack Initiation ◽  
Crack Tip ◽  
Dislocation Dynamics ◽  
Crack Initiation And Propagation ◽  
Dislocation Dynamic ◽  
Discrete Dislocation ◽  
Initiation And Propagation

3D discrete dislocation dynamic (DDD) simulations are performed to simulate stage-I fatigue crack initiation and propagation along the surface, in the primary grain and its neighbouring grain, in 316L stainless steel. The scenario of crack propagation in primary grain and the evolution of dislocation structure ahead of crack tip are discussed, and in addition crack tip sliding displacement is estimated. Probable mechanisms of crack propagation from primary grain to neighbouring grain are evaluated. In this process, surface relief in the neighbouring-grain under the influence of crack stress field in the primary grain is studied for varying neighbouring-grain orientations. An enhanced evolution of surface extrusions in the neighbouring grain, are observed in the presence of heterogeneous stress field (i.e., in the presence of crack in the primary grain), compared to that in the case of homogeneous stress field. In addition, influence of crack stress field on prior cyclic-deformed substructure is presented.

Main Surface Crack Propagation and Crack Initiation and Propagation on Counter Plain Surface Under Cyclic Bending

2004 ◽  
Author(s):  
Jin’ichiro Gotoh ◽  
Saburo Usami ◽  
Hiroshi Morita
Keyword(s):  
Crack Initiation ◽  
Crack Propagation ◽  
Main Crack ◽  
Plate Thickness ◽  
J Integral ◽  
Crack Initiation And Propagation ◽  
Cyclic Bending ◽  
Initiation And Propagation ◽  
Integral Range ◽  
Counter Surface

Cyclic bending is a dominant loading mode in structures sustaining thermal loads. Under cyclic bending loads, a crack also initiates and propagates on the counter surface while the main crack grows. And then, these cracks meet and penetrate the thickness of the component. Numerical analysis was performed for the evaluation of the main elliptical crack propagation and crack initiation and propagation at the counter surface under cyclic out-of-plane bending. An inelastic three-dimensional finite element analysis took crack opening and closure into account. When the front surface is in tension, the main crack opens and the compressive strain on the counter surface increases. Thus, deeper the main crack, larger the total strain range on the counter surface and this stimulates crack initiation on the counter surface. As the main crack propagates, the J-integral range at the deepest point decreases for deeper than 40 % of the plate thickness, and the crack grows slower. On the other hand, the J-integral range of the counter surface crack increase rapidly and crack propagation rate of the counter crack becomes larger than that of the main crack. Both the cracks on front and counter surfaces meet near 2/3 of the plate thickness of the component. The calculated crack propagation rates in both longitudinal and depth directions of the main and the counter surface cracks based on the J-integral ranges are close to the experimental ones.

Diagnostic Testing on Crack Propagation of Asphalt Pavement Materials

2015 ◽  
Vol 667 ◽  
pp. 396-401
Author(s):  
Gang Shen ◽  
Xin Qiu ◽  
Jue Qiang Tao ◽  
Ning Da Du ◽  
Yong Ju Hu
Keyword(s):  
Acoustic Emission ◽  
Crack Propagation ◽  
Acoustic Emission Signal ◽  
Asphalt Concrete ◽  
Concrete Pavement ◽  
Analysis Method ◽  
Emission Signal ◽  
Pavement Structure ◽  
Asphalt Concrete Pavement ◽  
Acoustic Emission Technology

Asphalt concrete is a typical road building material of advanced asphalt pavements. Under the reciprocating vehicle loading, fatigue cracks are reduced inevitably, which seriously affect road performance. Therefore, effective detection and diagnosis of fatigue crack propagation has become a hot research issue. Acoustic emission detection test is a new dynamic nondestructive testing technology which has some features of real-time, online and overall detection. The main purpose of this paper systematically analyses the development process of acoustic emission technology applied in health monitoring field of asphalt concrete pavement structure, and to state the acoustic emission source localization principle, the parameters of acoustic emission signal analysis method, the acoustic emission signal waveform analysis method, etc. Furthermore, from the aspects of the asphalt concrete fatigue performance, crack evolution process and positioning technology, this paper fundamentally discuss the future technological development prospect of acoustic emission technology which is applied in the field of monitoring and diagnosis of asphalt concrete pavement structure, and provide a new perspective for the whole dynamic maintenance of road , and the information implementation of pavement maintenance strategies at later stage.

Experience of application of epoxн asphalt concrete pavement on road bridges

2019 ◽  
pp. 78-92
Author(s):  
Vladimir Zelenovsky ◽  
◽  
Ivan Kopinets ◽  
Arthur Onishchenko ◽  
◽  
...  
Keyword(s):  
Asphalt Concrete ◽  
Concrete Pavement ◽  
Asphalt Concrete Pavement
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