Crack growth pattern prediction in a thin walled cylinder based on closed form thermo-elastic stress intensity factors
Circumferential crack growth pattern in a thin-walled cylinder is studied. Thermo-elastic stresses in a cylinder subjected to thermomechanical loads are extracted. Closed form thermo-elastic stress intensity factor for cracked cylinder are derived using weight function method. An algorithm is developed to simulate different crack growth patterns utilizing a very high efficiency weight function method. This would lessen the taken time for the analyses compared to other numerical methods such as FEM. Results show that while the load effect on cylinder subjected to thermal load lead to the crack growth in small aspect ratio, in cylinder subjected to mechanical loads, it would lead to the growth of crack in large aspect ratio. The results show that, apart from load effects, the cylinders containing initial semi-circular crack have the longest life among the cylinders containing initial semi-elliptical crack with the same initial depth.
KeywordsCylinder Crack growth pattern Weight function Stress intensity factor
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- R. Ghajar, M. Abbaspour and H. S. Googarchin, Explicit expressions of stress intensity factor for external semielliptical circumferential cracks in a cylinder under mechanical and thermal loads, Modares Mechanical Engineering, 14 (2014) 90–98.Google Scholar
- R. Ghajar and H. S. Googarchin, Investigation of pressure gradient effect on stress intensity factor variations in autofrettaged cracked thick-walled tubes using two dimensional weight function method, Modares Mechanical Engineering, 14 (2014) 134–147.Google Scholar