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GUO Wei, ZHAO Lei, XU Lianyong, HAN Yongdian. The analysis of multiple surface cracks growth behavior under the interaction of creep cracks[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(8): 44-49. DOI: 10.12073/j.hjxb.2019400207
Citation: GUO Wei, ZHAO Lei, XU Lianyong, HAN Yongdian. The analysis of multiple surface cracks growth behavior under the interaction of creep cracks[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(8): 44-49. DOI: 10.12073/j.hjxb.2019400207
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The analysis of multiple surface cracks growth behavior under the interaction of creep cracks

  • Tianjin University, Tianjin 300072, China;Tianjin Key Laboratory of Advanced Joining Technology, Tianjin 300072, China

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  • Received Date: October 08, 2018
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    • Abstract
  • The damage model was implemented into user subroutine of commercial ABAQUS code to calculate the damage accumulation in each time interval and to simulate the crack growth. The influence of crack configurations and residual stress on crack growth behavior in the presence of multiple surface cracks were studied through the variation of crack growth rate. With the relative surface crack sizes (a/t, a/c,) become larger and the distance between two cracks (s/c) becomes close, the interaction between two surface cracks were enhanced and the crack growth behavior was improved. Besides, the existence of residual tensile stress also accelerated the crack growth rate. According to the change of crack growth rates, the critical value of γcreep for combination of multiple creep surface cracks was assumed to be 1.27. As γcreep ≥ 1.27 two interacting cracks should be considered to combine into a new big crack otherwise they can be treated as isolated cracks, respectively.
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