Stress Analysis of Subsurface Cracks in Railway Lines Leading to Failure

McIntosh, Benjamin (2013). Stress Analysis of Subsurface Cracks in Railway Lines Leading to Failure Honours Thesis, School of Engineering, The University of Queensland.

       
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Author McIntosh, Benjamin
Thesis Title Stress Analysis of Subsurface Cracks in Railway Lines Leading to Failure
School, Centre or Institute School of Engineering
Institution The University of Queensland
Publication date 2013
Thesis type Honours Thesis
Supervisor Bill Daniel
Total pages 32
Language eng
Subjects 0913 Mechanical Engineering
Formatted abstract
Subsurface cracking of railway lines due to fatigue is a common problem that is not yet fully understood. This subsurface cracking is referred to as ‘railway squats’ due to the visual depression of the rail from plastic flow of the metal near the crack, and are apparent on all used railroads worldwide. This thesis aimed to observe railway squat cracks approaching the point of rail failure. An extensive analytical breakdown of the Winkler Model for calculating Stress Intensity Factors was used in conjunction with modelling on Ansys Workbench. A prediction model for failure was included, however lacked the detail of the way in which it fails. Without more extensive testing and LEFM results, the original aim was not fully achievable. The results obtained through this thesis can be used to predict the most likely cause of how failure would occur, and can be used as a solid grounding for future work in the field. For failure to occur, the kinking angle must be high so the crack can propagate down into the head of the rail which implies an initial dominance of mode II in the early stages of crack growth, followed by prominent bending stresses to continue further propagation for rail fracture.
Keyword Stress analysis

Document type: Thesis
Collection: UQ Theses (non-RHD) - UQ staff and students only
 
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Created: Fri, 04 Dec 2015, 15:20:25 EST by Asma Asrar Qureshi on behalf of Scholarly Communication and Digitisation Service