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Research Papers: Materials and Fabrication

The Interacting Effect for Collinear Cracks Near Mismatching Bimaterial Interface Under Elastic Creep

[+] Author and Article Information
Yanwei Dai

Department of Engineering Mechanics,
AML, Tsinghua University,
Meng Minwei Science and Technology Building,
Tsinghua Park,
Haidian District,
Beijing 100084, China
e-mail: daiyw13@mails.tsinghua.edu.cn

Yinghua Liu

Department of Engineering Mechanics,
AML, Tsinghua University,
Meng Minwei Science and Technology Building,
Tsinghua Park,
Haidian District,
Beijing 100084, China
e-mail: yhliu@mail.tsinghua.edu.cn

Haofeng Chen

Department of Mechanical
and Aerospace Engineering,
University of Strathclyde,
James Weir Building,
75 Montrose Street,
Glasgow G1 1XJ, UK
e-mail: haofeng.chen@strath.ac.uk

Donghuan Liu

Department of Applied Mechanics,
University of Science
and Technology Beijing,
Beijing 100083, China
e-mail: liudh@ustb.edu.cn

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received June 29, 2015; final manuscript received September 20, 2015; published online April 28, 2016. Assoc. Editor: Marina Ruggles-Wrenn.

J. Pressure Vessel Technol 138(4), 041404 (Apr 28, 2016) (10 pages) Paper No: PVT-15-1137; doi: 10.1115/1.4031725 History: Received June 29, 2015; Revised September 20, 2015

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 (MF) 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 are 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 MF. 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 nonconservative ranges to use the combination rules of ASME, API 579, and R6 codes are rediscussed and presented.

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References

Figures

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Fig. 1

Schematic diagram of collinear cracks near MBI

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Fig. 2

Diagram of procedure for C* calculation of creep crack near MBI

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Fig. 3

Typical FE mesh: (a) typical whole plate mesh and (b) crack tip mesh

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Fig. 4

Comparisons of dimensionless SIF between Murakami and present FE solutions

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Fig. 5

Interacting factors for undermatching with various creep exponents: (a) inner crack tip I and (b) outer crack tip O

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Fig. 6

Variation of C* with different MF at (a) inner tip and (b) outer tip

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Fig. 7

Variation of γ¯creep with different MF at (a) inner tip I and (b) outer tip O

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Fig. 10

Variation of ΛI and ΛO for different MF: (a) inner tip I and (b) outer tip O

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Fig. 9

Variation of ΛI and ΛO for different creep exponents: (a) inner tip I and (b) outer tip O within undermatching

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Fig. 8

Variation of ΛI and ΛO for different creep exponents: (a) inner tip I and (b) outer tip O under overmatching

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