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| Finite Element Method for Predicting Crack Initiation Angle of Mixed Mode Crack Based on Seam Crack Model |
| Received:August 24, 2016 Revised:February 15, 2017 |
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| DOI：10.7643/ issn.1672-9242.2017.02.021 |
| KeyWord:mixed-mode crack crack initiation angle seam crack SIF maximum circumferential stress criterion |
| Author | Institution |
| WANG Yue |
Qingdao Branch of Naval Aeronautical Academy, Qingdao , China |
| MU Zhi-tao |
Qingdao Branch of Naval Aeronautical Academy, Qingdao , China |
| LIU Tao |
Qingdao Branch of Naval Aeronautical Academy, Qingdao , China |
| NIU Yong |
Qingdao Branch of Naval Aeronautical Academy, Qingdao , China |
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| Abstract: |
| Objective To predict the initiation angle of mixed-mode crack under multiaxial stress. Methods The Seam crack in commercial finite element software ABAQUS was used to simulate penetrating crack damage according to elastic property of materials. A 3-D finite element model of center-hole with edge cracking plate under multiaxial stress was established. Displacement and extrapolation method and linear fitting method were used to calculate the SIF of crack tip. Initiation angles of cracks were predicted by maximum circumferential stress criterion, which were compared with those obtained by relative papers. Results The maximum error of SIF between the result obtained by finite element models and that of document was within 2%, while the maximum error of initiation angles was within 3%. Conclusion The results obtained by the finite element method in this paper are in line with document; therefore, the finite element method used for calculating the initiation angle of mixed-mode crack is reliable. |
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