Denneman, EWu, RKearsley, EPVisser, AT2009-11-232009-11-232009-07Denneman, E, Wu, R, Kearsley, EP and Visser, AT. 2009. Fracture mechanics in pavement design. Sustainable Transport: 28th Annual Transport Conference (SATC) 2009, Pretoria, South Africa, 6-9 July 2009, pp 255-2629781920017392http://hdl.handle.net/10204/3773Sustainable Transport: 28th Annual Transport Conference (SATC) 2009, Pretoria, South Africa, 6-9 July 2009Pavement materials are subjected to high-cycle loading regimes. Conventional design methods employ the Palmgren-Miner damage hypothesis to predict the fatigue life of pavement materials. The material itself is usually characterized in the analysis by a measured material parameter. This approach is practical and can readily be calibrated, but does have some known shortcomings. The aim of the paper is to discuss some of the limitations of empirically based, Palmgren-Miner type, damage laws. The paper also seeks to promote the use of size independent material properties to characterize pavement materials. Some material properties used in current methods, such as the concepts of strain at break and flexural strength are known to exhibit size effects. Examples of the use of fracture mechanics providing an alternative to these conventional design parameters are given in the paper. The paper shows that although much further development is required before fracture mechanics can be relied upon to fully replace the Palmgren-Miner type damage laws, some of the concepts can already be applied to improve pavement design methods.enPalmgren-minerFracture mechanics principlesFracture formationFracture propagationPavement materialsPavement designConference PresentationDenneman, E., Wu, R., Kearsley, E., & Visser, A. (2009). Fracture mechanics in pavement design. Southern African Transport Conference (SATC). http://hdl.handle.net/10204/3773Denneman, E, R Wu, EP Kearsley, and AT Visser. "Fracture mechanics in pavement design." (2009): http://hdl.handle.net/10204/3773Denneman E, Wu R, Kearsley E, Visser A, Fracture mechanics in pavement design; Southern African Transport Conference (SATC); 2009. http://hdl.handle.net/10204/3773 .TY - Conference Presentation AU - Denneman, E AU - Wu, R AU - Kearsley, EP AU - Visser, AT AB - Pavement materials are subjected to high-cycle loading regimes. Conventional design methods employ the Palmgren-Miner damage hypothesis to predict the fatigue life of pavement materials. The material itself is usually characterized in the analysis by a measured material parameter. This approach is practical and can readily be calibrated, but does have some known shortcomings. The aim of the paper is to discuss some of the limitations of empirically based, Palmgren-Miner type, damage laws. The paper also seeks to promote the use of size independent material properties to characterize pavement materials. Some material properties used in current methods, such as the concepts of strain at break and flexural strength are known to exhibit size effects. Examples of the use of fracture mechanics providing an alternative to these conventional design parameters are given in the paper. The paper shows that although much further development is required before fracture mechanics can be relied upon to fully replace the Palmgren-Miner type damage laws, some of the concepts can already be applied to improve pavement design methods. DA - 2009-07 DB - ResearchSpace DP - CSIR KW - Palmgren-miner KW - Fracture mechanics principles KW - Fracture formation KW - Fracture propagation KW - Pavement materials KW - Pavement design LK - https://researchspace.csir.co.za PY - 2009 SM - 9781920017392 T1 - Fracture mechanics in pavement design TI - Fracture mechanics in pavement design UR - http://hdl.handle.net/10204/3773 ER -