The interacting effect for collinear cracks near mismatching bimaterial interface under elastic creep

Yanwei Dai, Yinghua Liu, Haofeng Chen, Donghuan Liu

Research output: Contribution to journalArticle

Abstract

In this paper, the modified reference stress method is introduced to estimate the C* integral for collinear creep cracks near the mismatching bimaterial interface (MBI) and the process that leads to these solutions is also presented. The interacting factors for creep cracks near the MBI are defined and the influences of different creep exponents and mismatching factors on creep interacting effect are studied. Results show that if two inner creep crack tips get closer, the interacting effect of creep cracks near the MBI will become much stronger. Under the same condition, the interacting factors of the creep cracks in materials with higher creep exponent is larger than that of the creep cracks in materials with lower creep exponent. For the same crack location, C* integral decreases with the increase of mismatching factors. Two novel dimensionless parameters are proposed to characterize the rationality of combination rules of ASME, API 579 and R6 codes for the interacting effect for creep collinear cracks near the MBI. With the proposed parameter, the non-conservative ranges to use the combination rules of ASME, API 579 and R6 codes are re-discussed and presented.
LanguageEnglish
Number of pages38
Journal Journal of Pressure Vessel Technology
DOIs
Publication statusAccepted/In press - 20 Sep 2015

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Creep
Cracks
Application programming interfaces (API)
Crack tips

Keywords

  • mismatching bimaterial interface
  • interacting effect
  • collilnear creep cracks
  • elastic creep

Cite this

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title = "The interacting effect for collinear cracks near mismatching bimaterial interface under elastic creep",
abstract = "In this paper, the modified reference stress method is introduced to estimate the C* integral for collinear creep cracks near the mismatching bimaterial interface (MBI) and the process that leads to these solutions is also presented. The interacting factors for creep cracks near the MBI are defined and the influences of different creep exponents and mismatching factors on creep interacting effect are studied. Results show that if two inner creep crack tips get closer, the interacting effect of creep cracks near the MBI will become much stronger. Under the same condition, the interacting factors of the creep cracks in materials with higher creep exponent is larger than that of the creep cracks in materials with lower creep exponent. For the same crack location, C* integral decreases with the increase of mismatching factors. Two novel dimensionless parameters are proposed to characterize the rationality of combination rules of ASME, API 579 and R6 codes for the interacting effect for creep collinear cracks near the MBI. With the proposed parameter, the non-conservative ranges to use the combination rules of ASME, API 579 and R6 codes are re-discussed and presented.",
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author = "Yanwei Dai and Yinghua Liu and Haofeng Chen and Donghuan Liu",
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The interacting effect for collinear cracks near mismatching bimaterial interface under elastic creep. / Dai, Yanwei; Liu, Yinghua; Chen, Haofeng; Liu, Donghuan.

In: Journal of Pressure Vessel Technology, 20.09.2015.

Research output: Contribution to journalArticle

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AU - Liu, Yinghua

AU - Chen, Haofeng

AU - Liu, Donghuan

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AB - In this paper, the modified reference stress method is introduced to estimate the C* integral for collinear creep cracks near the mismatching bimaterial interface (MBI) and the process that leads to these solutions is also presented. The interacting factors for creep cracks near the MBI are defined and the influences of different creep exponents and mismatching factors on creep interacting effect are studied. Results show that if two inner creep crack tips get closer, the interacting effect of creep cracks near the MBI will become much stronger. Under the same condition, the interacting factors of the creep cracks in materials with higher creep exponent is larger than that of the creep cracks in materials with lower creep exponent. For the same crack location, C* integral decreases with the increase of mismatching factors. Two novel dimensionless parameters are proposed to characterize the rationality of combination rules of ASME, API 579 and R6 codes for the interacting effect for creep collinear cracks near the MBI. With the proposed parameter, the non-conservative ranges to use the combination rules of ASME, API 579 and R6 codes are re-discussed and presented.

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