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| Numerical simulation on entire-process of member fracture by discrete element method |
| Received:August 02, 2021 Revised:November 04, 2021 |
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| DOI：10.7511/jslx20210802001 |
| KeyWord:discrete element method member fracture fiber beam model contact bonding numerical simulation |
| Author | Institution |
| 齐念 |
南京交通职业技术学院, 南京 |
| 郑开启 |
南京林业大学 土木工程学院, 南京 |
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| Abstract: |
| The fracture of members is involved in some problems like large deformation,nonlinearity,and discontinuity,so there are limitations to simulating this complex mechanical behavior using the common numerical methods.Firstly,based on particle discrete element method (DEM),a DEM fiber beam model is proposed for structural elastoplastic analysis,where the beam fiber is equivalent to distributed springs of contact bonding.Then the fracture simulation algorithm of members and a crack criterion of fibers are established on the basis of the above model.The given model is applied in a cantilever beam and the entire process for the beam from elastic to elastoplastic stage,and further to fracture failure stage is studied.The results show that the response of a structure and cracking failure modes of the cross section obtained from the numerical simulation are well reasonable.Finally,the present method is used to simulate the collapse of a single-layer reticulated shell.The simulation results,including the process of member fracture and the structural failure mode,are consistent with the response of shaking table test of the shell.The comparisons made verify the accuracy and validity of this method. |
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