Characteristics and implications of material mismatch on mode II creep crack tip field: theoretical analysis and numerical investigation

Yanwei Dai, Fei Qin, Yinghua Liu, Haofeng Chen, Filippo Berto

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Article number103035
JournalTheoretical and Applied Fracture Mechanics
Volume114
Early online date22 Jun 2021
DOIs
Publication statusPublished - 31 Aug 2021

Keywords

  • mismatch effect
  • mode II crack
  • creeping solids
  • two-order term solutions
  • numerical analysis

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