Fracture mechanics in pavement design
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Authors
Wu, Rongzong
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Document Transformation Technologies
Abstract
Paper presented at the 28th Annual Southern African Transport Conference 6 - 9 July 2009 "Sustainable Transport", CSIR International Convention Centre, Pretoria, South Africa.
ABSTRACT: 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.
ABSTRACT: 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.
Description
This paper was transferred from the original CD ROM created for this conference. The material was published using Adobe Acrobat 8.0 Technology.
The original CD ROM was produced by Document Transformation Technologies Postal Address: PO Box 560 Irene 0062 South Africa. Tel.: +27 12 667 2074 Fax: +27 12 667 2766 E-mail: nigel@doctech URL: http://www.doctech.co.za
Keywords
Sustainable transport, Pavement materials, Palmgren-Miner damage hypothesis, Fatigue life
Sustainable Development Goals
Citation
Denneman, E, Wu, R, Kearsley, EP & Visser, AT 2009,'Fracture mechanics in pavement design', Paper presented to the 28th Annual Southern African Transport Conference, South Africa, 6-9 July. p.255-262