Mode I SIFs for internal and external surface semi-elliptical crack located on a thin cylinder

Authors

  • O M Fakhri
  • A K Kareem
  • A E Ismail
  • S Jamian
  • Mohammed Najeh Nemah

Abstract

Stress intensity factors (SIFs) considered one of the most important parameters in fracture mechanics, SIFs can be used to describe the crack growth as well as fracture behaviour. In this paper, mode I SIFs are calculated by finite element software ANSYS, for a single semi-elliptical circumferential crack in a thin cylinder. The cracks were located either on the internal or external surface of the cylinder and subjected to two different types of loading, internal pressure and tension, applied separately. To produce results in a more comprehensive form, the dimensionless analysis was used, and a wide variety of parameters that define the crack geometry is considered. The ratio of crack depth to crack length ranging from 0.4 to 1.2, the ratio of crack depth to cylinder wall thickness vary between 0.2, 0.5 and 0.8, and the ratio of the cylinder wall thickness to the cylinder internal radius 0.1. Based on the obtained results, the distribution of SIFs found to be symmetric and the position of the maximum SIFs on the crack front strongly affected by the aspect ratio.Overall, external cracks exhibit slightly higher SIFs than those of internal cracks, and transition phenomenon occurs on crack aspect ratio between 0.6 and 0.8. In addition, a significant effect for the relative depth of the crack on SIFs, which is more pronounced in surface points than deep points on crack front.

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Published

2019-11-25

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Section

Articles