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Numerical Analyses of Interaction Behavior of Multiple Surface Cracks Using a Modified Creep-Damage Model and Fracture Mechanics Approach

[+] Author Affiliations
Jian-Feng Wen, Fu-Zhen Xuan, Shan-Tung Tu

East China University of Science & Technology, Shanghai, China

Paper No. PVP2013-97982, pp. V005T11A029; 8 pages
doi:10.1115/PVP2013-97982
From:
  • ASME 2013 Pressure Vessels and Piping Conference
  • Volume 5: High-Pressure Technology; ASME NDE Division; Rudy Scavuzzo Student Paper Symposium
  • Paris, France, July 14–18, 2013
  • Conference Sponsors: Pressure Vessels and Piping Division, Nondestructive Evaluation Engineering Division
  • ISBN: 978-0-7918-5569-0
  • Copyright © 2013 by ASME

abstract

The propagation and coalescence processes of two initially semi-elliptical surface cracks in a plate at high temperature are predicted by using a modified creep-damage model implemented with the numerical method. The creep growth of multiple cracks during pre-coalescence and coalescence periods is investigated in detail. For the purpose of comparison, the step-by-step fracture-mechanics-based finite element technique is also employed. The results indicated that, before coalescence, the cracks grow steadily but relatively rapidly in the adjacent district; after the cracks coalesce, the concave positions of the newly combined crack front exhibit a considerably high growth rate. Compared with the fracture mechanics approach, the numerical approach based on the modified creep-damage model enables to give more detailed information on creep crack initiation and more reliable estimate of propagation. In addition, the combination rules given by existing standards are also examined.

Copyright © 2013 by ASME

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