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| Modelling of crack propagation by finite fracture mechanics and scaled boundary finite element method |
| Received:December 07, 2015 Revised:June 18, 2016 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx201702007 |
| KeyWord:finite fracture mechanics Scaled Boundary Finite Element Method crack propagation variable crack propagation length hybrid fracture criterion |
| Author | Institution |
| 钟红 |
大连理工大学 建设工程学部 大连 |
| 牟昊 |
大连理工大学 建设工程学部 大连 |
| 张文宣 |
大连理工大学 建设工程学部 大连 |
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| Abstract: |
| A numerical model of crack propagation is proposed based on Finite Fracture Mechanics and Scaled Boundary Finite Element Method (SBFEM). With hybrid fracture criterion based on Finite Fracture Mechanics as the criterion of crack initiation, the crack is assumed to be initiated and to grow if and only if both the energy release rate and the maximum circumferential stress simultaneously reach critical values. By introducing polygon SBFEM, the stress field and displacement field in the vicinity of a crack tip are obtained semi-analytically without any enrichment. When energy release rate is calculated, the required changes in the mesh are easily accommodated by shifting the crack tip within the cracked polygon without changing the global mesh structure, hence the workload of remeshing is minimized. Confirming the crack propagation length on hybrid fracture criterion can avoid arbitrary assumptions and it is more realistic to simulate crack propagation of variable length. By analysing the mixed mode crack propagation of four-point shear beam, the effectiveness of the proposed model is verified. Finally, the model is applied to simulate the crack propagation of a gravity dam model, which indicates that the proposed model is not only simple in form and application but also has high precision. |