Analysis of Fatigue of Paving Mixtures From the Fracture Mechanics Viewpoint

Majidzadeh, K; Kauffmann, E M; Saraf, CL

doi:10.1520/stp38809s

Cited by 26 publications

(4 citation statements)

References 5 publications

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“…(8ic) by the original expression, Eq. (27), and obtain the important result, . at the time t = a/3ä.…”

Section: (81c)mentioning

confidence: 92%

A Theory of Crack Growth in Viscoelastic Media

Schapery¹

1973

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Unclassified SIM iirily ( l.issific ulion 11DOCUMENT CONTROL DATA R&D '*■»•■ » nrily t lu\ siii* nffttt «I title, luxty u/ uhstrut t ami indexing •mtutUtthtn must V untnrvd w f imt tho uvcrutl teport is ctaavUltd) A theory is developed for predicting the time-dependent size and shape of cracks in linearly viscoelastic, Isotropie media, and its validity is demonstrated by applying the theory to crack growth end failure of unfilled and particulatefilled polymers. -Starting with a bounded solution for tne stress distribution near a crack tip in an elastic body and the extended correspondence principle for viscoelastic media with moving boundaries,'a simple equation is derived for predicting instantaneous crack tip velocity in terms of the opening-mode stress intensity factorj although the undamaged portion of the continuum is assumed linear, no significant restrictions are placed on the nature of the disintegrating material near the crack tip and, therefore, this material may be highly nonlinear, rate-dependent, and even discontinuous« A further analysis is made to predict the time at which a crack starts to grow, and then some explicit solutions are given for this so-called fracture initiation time, the time-dependent crack growth, and the time at which gross failure occurs under time-varying applied forces and environmental parameters» Following a derivation of the linear cumulative damage rule, an examination of its theoretical range of validity, and a discussion of the experimental determination of fracture properties, the theory is applied to monolithic and composite materials under constant and varying loads. Some concluding remarks deal with extensions of the theory to include finite strain effects, crack growth in the two shearing modes and in combined opening and shearing modes, and adhesive fracture. OJMCINA IIHC ACTIVITY (t'urjuirate itutfutr) Texas A&M University Texas Engineering Experiment Station DD,

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“…(8ic) by the original expression, Eq. (27), and obtain the important result, . at the time t = a/3ä.…”

Section: (81c)mentioning

confidence: 92%

A Theory of Crack Growth in Viscoelastic Media

Schapery¹

1973

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“…The first studies started by Majidzadeh et al [2] with the application of the fracture mechanics in the analysis of pavement fatigue where the fatigue life of paving mixtures in terms of material constants, geometry, boundary conditions, and the state of stress is predicted. In that work, fatigue is defined in terms of crack initiation, influence on crack growth, and critical stress intensity at the critical failure point.…”

Section: Introductionmentioning

confidence: 99%

Multi-cracks Modeling in Reflective Cracking

Pais

Minhoto

Shatnawi³

2012

7th RILEM International Conference on Cracking in Pavements

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Abstract. Reflective cracking is a major concern for engineers facing the problem of road maintenance and rehabilitation. The problem appears due to the presence of cracks in the old pavement layers that propagate into the pavement overlay layer when traffic load passes over the cracks and due to the temperature variation. The stress concentration in the overlay just above the existing cracks is responsible for the appearance and crack propagation throughout the overlay. The analysis of the reflective cracking phenomenon is usually made by numerical modeling simulating the presence of cracks in the existing pavement and the stress concentration in the crack tip is assessed to predict either the cracking propagation rate or the expected fatigue life of the overlay. Numerical modeling to study reflective cracking is made by simulating one crack in the existing pavement and the loading is usually applied considering the shear mode of crack opening. Sometimes the simulation considers the mode I of crack opening, mainly when temperature effects are predominant. Thus, this paper presents a study where multiple cracks are modeled to assess the reflective cracking phenomenon and to compare to the case of only one crack. The modeling with only one crack was made simulating both mode I and mode II of crack opening taking into account the traffic effects. The influence of multiple cracks was expressed in terms of stress and strain in the zone above existing cracks. One of the conclusions from the current study is that the presence of multiple cracks can lead to a state of stress/strain higher than those obtained with only one crack. Also the position of the crack modeled in the finite elements analysis have a significant influence in the state of stress/strain obtained. However, the consideration of only one crack is sufficient to obtain significant results in the reflective cracking modeling.

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“…Distress resulting from HMA pavement fatigue (alligator cracking) has been a well-recognized problem in the United States since 1948 (2). Several researchers have investigated the fatigue characteristics of asphalt paving mixtures and their use in pavement design (3)(4)(5)(6). A thorough investigation was conducted during the Strategic Highway Research Program when several accelerated performance tests for assessment of fatigue response were evaluated (7 ).…”

Section: Introductionmentioning

confidence: 99%

Quantitative Field Evaluation and Effectiveness of Fine Mix Under Hot-Mix Asphalt Base in Flexible Pavements

Al‐Qadi

Loulizi

Lahouar

et al. 2003

Transportation Research Record: Journal of the Transportation R

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Testing was conducted with the main objective of predicting the effect of incorporating a fine hot-mix asphalt (HMA) layer under an HMA base on the long-term fatigue performance of flexible pavements. Testing at the Virginia Smart Road allowed the determination of the vertical compressive stress and horizontal transverse strain induced by a steering-axle tire of 25.8 kN (5,800 lb) under the HMA layer of two pavement designs, one of which included a fine surface mix below a base mix. Stresses and strains were measured for four different speeds [8, 24, 40, and 72 km/h (5, 15, 25, and 45 mph)], for three tire inflation pressures [552, 655, and 724 kPa (80, 95, and 105 psi)], and at different temperatures. Stresses were measured with pressure cells, while strains were measured with H-type strain gauges embedded in the HMA layers during construction. As expected, temperature was found to significantly affect the vertical compressive stresses and horizontal transverse strains measured under the HMA layer. Speed, on the other hand, did not affect the magnitude of the vertical compressive stress measured in any of the layers but did affect the loading time. However, speed was found to significantly affect the horizontal transverse strain measured under the HMA layer. The compressive stress and horizontal transverse strain measured at the bottom of the HMA layer at depths greater than 150 mm (6 in.) were found to be independent of tire inflation pressure ranges from 552 to 724 kPa (80 to 105 psi). It appears that incorporation of a fine HMA at the bottom of a HMA base layer would increase the fatigue lives of flexible pavements.

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Analysis of Fatigue of Paving Mixtures From the Fracture Mechanics Viewpoint

Cited by 26 publications

References 5 publications

A Theory of Crack Growth in Viscoelastic Media

A Theory of Crack Growth in Viscoelastic Media

Multi-cracks Modeling in Reflective Cracking

Quantitative Field Evaluation and Effectiveness of Fine Mix Under Hot-Mix Asphalt Base in Flexible Pavements

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