期刊
AIMS MATERIALS SCIENCE
卷 3, 期 4, 页码 1649-1664出版社
AMER INST MATHEMATICAL SCIENCES-AIMS
DOI: 10.3934/matersci.2016.4.1649
关键词
crack combination rule; fatigue crack growth; finite element analysis; flaw characterization
资金
- National Natural Science Foundation of China [11472105, 51505149]
- 111 project
- Shanghai Sailing Program [15YF1402900]
- China Postdoctoral Science Foundation [2015M581543]
A plate under cyclic loading, containing two coplanar surface flaws with both identical and dissimilar sizes, is considered in the present study. By conducting detailed step-by-step finite element analyses, the conservatism contained in different combination rules for multiple coplanar flaws provided by fitness-for-service codes (ASME, BS7910, API579 and GB/T19624) have been quantitatively assessed for the fatigue failure mode. The findings show that the re-characterization guideline provided by ASME and BS7910 may cause non-conservative estimations when two crack sizes are similar, whereas API579 and GB/T19624 lead to excessively pessimistic predictions for almost all the cases. Based on the fatigue crack growth life, we suggest a new combination rule and conclude that it always yields a reasonable estimation with necessary conservatism, for various initial crack depths, material constants and relative sizes of two cracks.
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