Numerical Analysis of the Transient Thermal Stress Intensity Factors in Cylinders Containing an External Circumferential Semi-Elliptical Crack

Document Type : Regular Paper

Authors

1 Faculty of Aerospace Engineering, Malek-Ashtar University of Technology, Tehran, Iran

2 Department of Mechanical Engineering, College of Engineering, Islamic Azad University, Tehran, Iran

Abstract

In this paper, the transient thermal stress intensity factors for circumferential semi-elliptical crack located on the external surface of the cylinder are determined numerically. The internal surface of the cylinder is exposed to ultra-cold fluid, and the external wall is kept at a constant temperature. The three-dimensional finite element method in ABAQUS software and singular elements in the crack front has been used. In order to ensure the accuracy of the modelling process, stress intensity factors on the cylinder containing the semi-elliptical crack under mechanical loading for different geometric dimensions of the cylinder are extracted, and the results are evaluated with available data. In the research process, transient thermal stress has been modelled using an uncoupled thermoelasticity model in the quasi-static state. Also, the thermal stress results in steady-state are compared to the existing analytical data and, excellent agreement is achieved. Finally, transient thermal stress intensity factors are presented for different values of cylinder radius ratio and various relative depths and aspect ratios of the crack.

Highlights

  • Transient thermal SIFs for an external circumferential semi-elliptical crack were studied.
  • Three-dimensional finite element method was employed to determine SIFs.
  • The effect of various geometric parameters such as cylindrical radius ratio, crack aspect ratio and relative crack depth has been investigated.

Keywords

Main Subjects

References

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History

  • Receive Date: 14 September 2021
  • Revise Date: 05 January 2022
  • Accept Date: 20 April 2022

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