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| Local cohesive finite element method with finite interface thickness |
| Received:December 04, 2020 Revised:January 12, 2021 |
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| DOI：10.7511/jslx20201204002 |
| KeyWord:cohesive finite element method interface thickness augmented virtual internal bond discretized virtual internal bond numerical simulation |
| Author | Institution |
| 盛泽强 |
上海交通大学 船舶海洋与建筑工程学院, 上海 |
| 王毓杰 |
上海交通大学 船舶海洋与建筑工程学院, 上海 |
| 张振南 |
上海交通大学 船舶海洋与建筑工程学院, 上海 |
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| Abstract: |
| The conventional cohesive finite element method is powerful in simulating fracture propagation in brittle materials.However,it has some limitations in fracture simulation.Firstly,the numerical convergence gets worse with increasing element size.Secondly,the model stiffness is seriously reduced with decreasing element size.To overcome the two limitations,the local cohesive finite element method with finite interface thickness (TCFEM) is developed.In TCFEM,the cohesive elements are set in the potential fracturing zone.Each cohesive interface element has finite thickness.The constitutive relation of the augmented virtual internal bond is adopted for the quadrilateral cohesive element,which intrinsically contains the cohesive law of material.Due to the finite thickness of a cohesive element,a polygonal void is formed at the nodal spot.The discretized virtual internal bond is adopted to model the polygonal void as a bond cell.This ensures the geometrical integrity of the numerical model.The numerical examples suggest that this method is feasible and effective.Compared with the conventional CFEM,the new approach is able to overcome the stiffness reduction and improve the stability of numerical computation. |
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