| 余志祥,刘键,田永丁.柔性环连网多重非线性DEM分析法[J].计算力学学报,2025,42(1):122~129 |
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| 柔性环连网多重非线性DEM分析法 |
| Multi-nonlinear DEM analysis method of flexible ring net |
| 投稿时间：2023-08-16 修订日期：2023-10-20 |
| DOI：10.7511/jslx20230816005 |
| 中文关键词: 防护工程 环连网 离散元方法 拉伸试验 数值模拟 |
| 英文关键词:protective engineering ring net discrete element method tensile test numerical simulation |
| 基金项目:四川省科技计划项目重点研发项目(2022YFG0141);四川省科技计划资助项目(2023NSFSC0893);国家自然科学基金(51678504);国家重点研发项目(2018YFC1505405)资助. |
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| 中文摘要: |
| 针对防落石柔性网系统的多体动力学计算难题,提出了一种用于环连网多重非线性分析的离散元分析方法。开展了12组单环准静态拉伸试验,获得了网环拉伸受力全过程的力-位移曲线,明确了多种钢丝缠绕圈数条件下钢丝环的拉弯临界荷载、破断力、破断变形及破断能量。据此,确定了离散元模型的等效物理参数,并考虑了钢丝环套接区域的压扁软化和拉弯复合受力特性,标定了网环单元离散元模型的Bond键拉弯刚度控制参数,解决了环网单元的弯-拉协调等效难题。建立了密集套结的环连网离散元模型,并开展了环连网顶破全过程的数值模拟,结合环连网部件试验结果进行了比较分析。研究表明,环连网离散元分析方法准确模拟了钢丝环单元的弯-拉大变形受力特征及接触区域拉、弯、压复合受力破断模式;同时再现了环连网部件顶破全过程的接触滑动、塑性变形及冲切破坏等关键物理现象;离散元模型的破断力峰值、破断变形、拉伸刚度、弯曲刚度等关键结果均与试验吻合,验证了方法的合理性与可靠性。研究成果为柔性防护工程多重非线性精确量化分析提供了新途径。 |
| 英文摘要: |
| 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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