Numerical Simulation of Ductile Fracture in Modified Arcan Test
| Autor: | Egil Fagerholt, Odd Sture Hopperstad, Magnus Langseth, Tore Børvik, Gaute Gruben |
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| Rok vydání: | 2014 |
| Předmět: |
Explicit time integration
Materials science Computer simulation business.industry Ductile fracture Flow (psychology) Mode (statistics) crack propagation Fracture mechanics General Medicine Structural engineering Solver Fracture (geology) finite elements Point (geometry) business Cockcroft-Latham criterion |
| Zdroj: | Procedia Materials Science. 3:661-666 |
| ISSN: | 2211-8128 |
| DOI: | 10.1016/j.mspro.2014.06.109 |
| Popis: | In this study, the experimental results from a modified Arcan test on dual-phase steel are revisited in order to assess a numerical modelling approach for ductile fracture. This experiment is chosen since it displays a complex crack-path that undergoes three phases: fracture initiation and crack propagation with transition from Mode I to Mode II. A significantly larger amount of plastic dissipation is observed in the material at the point of fracture initiation compared to the material points along the crack-path. A numerical approach that is capable of capturing this complex crack-path is believed also to give good predictions in other complex fracture problems. The numerical simulations of the modified Arcan test are run with the nonlinear Finite Element (FE) code IMPETUS Afea Solver. Elements with tri-linear shape functions are utilized in combination with explicit time integration. The plastic behaviour of the material is modelled by the elastic-viscoplastic J2 flow theory using the Voce work-hardening rule. Both element erosion and node-splitting techniques are tested in order to simulate the crack propagation. It is shown that the node-splitting technique with a crack-tip enhancement gave the best prediction of the three different phases of the crack propagation. |
| Databáze: | OpenAIRE |
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