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| Multi-nonlinear DEM analysis method of flexible ring net |
| Received:August 16, 2023 Revised:October 20, 2023 |
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| DOI：10.7511/jslx20230816005 |
| KeyWord:protective engineering ring net discrete element method tensile test numerical simulation |
| Author | Institution |
| 余志祥 |
西南交通大学 土木工程学院, 成都 |
| 刘键 |
中铁二院工程集团有限责任公司, 成都 |
| 田永丁 |
西南交通大学 土木工程学院, 成都 |
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| Abstract: |
| A discrete element method for nonlinear multibody analysis of a ring net is proposed to address the computational challenges of multibody dynamics in flexible rockfall protection net systems.Twelve sets of single-ring quasi-static tensile tests were conducted out and the force-displacement curves were obtained,and the critical loads,breaking forces,breaking deformations,and breaking energies of the steel wire rings were determined under various wire winding turns.Accordingly,equivalent physical parameters of the discrete element model(DEM)were determined,considering the flattening softening and combined tensile-bending properties of the wire ring contact area.Furthermore,the bending-tensile stiffness control parameters of the Bond key of the ring net model were calibrated,addressing the challenging problem of bending-tensile coordination equivalent of the steel wire ring net.The DEM of the ring net with dense sets of knots was further established,and numerical simulations of top breaking of the ring network were conducted,followed by a comparative analysis with experimental results.The research demonstrates that the DEM of the ring net reproduces the bending-tensile deformation characteristic and tensile-bending-compression failure mode of the wire ring element in the contact area.It also reproduces the key physical phenomena of contact sliding,plastic deformation and shear failure throughout the process of top breaking tests.The key results,such as peak breaking force,breaking elongation,tensile stiffness,and bending stiffness of the DEM are consistent with the experimental results,validating the effectiveness and reliability of the proposed method.The findings provide a new approach for the quantitative analysis of flexible protection engineering. |
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