Characteristics and implications of material mismatch on mode II creep crack tip field : theoretical analysis and numerical investigation
Dai, Yanwei and Qin, Fei and Liu, Yinghua and Chen, Haofeng and Berto, Filippo (2021) Characteristics and implications of material mismatch on mode II creep crack tip field : theoretical analysis and numerical investigation. Theoretical and Applied Fracture Mechanics, 114. 103035. ISSN 0167-8442 (https://doi.org/10.1016/j.tafmec.2021.103035)
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Abstract
The mismatch effect in weldment is widely to be found in engineering practices. In this paper, the material mismatch effect on the mode II creep crack tip field is investigated and discussed. The mismatch effect on the C(t)-integral is presented. Both the local mismatch and the general mismatch are found to play important role in C(t)-integral under mode II condition. The mismatch effect on the stress field of mode II creep crack is also studied. The two-order term solutions are adopted to characterize the material mismatch effect on the mode II creep crack. The effect of creep coefficient, creep exponent as well as the HAZ thickness on the high order term solutions are also presented. Some typical cases by considering general mismatch and local mismatch effect are given to make a comparisons between the HRR field, FE solutions and the two-order term solutions. It can be seen that the two-order term solutions can coincide with the full field FE solutions quite reasonably regardless of creep extent, creep exponent, mismatch factor, and HAZ thickness. The material mismatch effect on the high order term solutions is significant under some conditions. A theoretical formula is presented to show the implication of material mismatch effect on creep crack growth under mode II condition based on stress damage model.
ORCID iDs
Dai, Yanwei, Qin, Fei, Liu, Yinghua, Chen, Haofeng ORCID: https://orcid.org/0000-0001-6864-4927 and Berto, Filippo;-
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Item type: Article ID code: 76966 Dates: DateEvent31 August 2021Published22 June 2021Published Online17 June 2021AcceptedSubjects: Technology > Mechanical engineering and machinery Department: Faculty of Engineering > Mechanical and Aerospace Engineering
Strategic Research Themes > Ocean, Air and SpaceDepositing user: Pure Administrator Date deposited: 01 Jul 2021 15:54 Last modified: 12 Dec 2024 11:31 URI: https://strathprints.strath.ac.uk/id/eprint/76966