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| Study on dynamic coupling algorithm based on DEM and FEM |
| Received:November 02, 2012 Revised:April 05, 2013 |
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| DOI：10.7511/jslx201305013 |
| KeyWord:finite element method discrete element method coupling algorithm dynamic coupling algorithm penalty function method |
| Author | Institution |
| 徐伟 |
华南理工大学 机械与汽车工程学院, 广州 |
| 臧孟炎 |
华南理工大学 机械与汽车工程学院, 广州 |
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| Abstract: |
| The discrete element method (DEM),one of effective numerical methods,can model fracture characteristics of brittle material such as crack propagation and dispersing fragments,but has poor computational efficiency which cannot be overcome essentially.By contrast,the conventional finite element method (FEM),which has advantages of high efficiency and stability,does not effectively simulate the failing procedure.We firstly propose improved coupling method based on penalty function method in order to improve computational accuracy.We develop a dynamic coupling algorithm which is based on improved coupling method:in the initial stage,the whole model is constructed with finite elements and no discrete elements; thereafter if the local damage happens,the finite elements impending to fail and their neighbors will be automatically converted into discrete elements and the glass fracture procedure is simulated in the region of discrete elements.The algorithm not only takes full advantages of the two methods mentioned above,but also overcomes low efficiency of DEM.The effectiveness of two algorithms mentioned before is validated by comparing the results of a few simple cases. |
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