柔性环形防护网顶破受力归一化分析

开展了6组环形钢丝网片单元顶破承载力试验,并基于LS-DYNA开展了非线性数值模拟,揭示了柔性环形网的顶破受力的三阶段工作特性。进一步考虑钢丝缠绕圈数、圆环直径、顶破端与环形网的面积比以及环形网长宽比等影响开展参数分析,据此提出了环形网片拉伸变形的解析计算方法,建立了顶破力-拉伸位移的相关性方程。研究结果表明:随着圆环缠绕圈数的增多,环形网的极限破断力线性增大,极限拉伸位移线性小幅减小;随着圆环直径的增加极限破断力指数型降低,极限拉伸位移线性增大;随着顶破端与网片的面积比的增大极限破断力和极限拉伸位移均幂函数持续减小,变化速率基本一致;随着环形网长宽比的增大,极限破断力和极限拉伸位移都呈幂函数减小,破断力的减小更为明显。研究成果可用于柔性防护系统环形网单元设计。

Normalization analysis of puncture force of steel wire ring net

Here,out-of-plane puncturing tests were conducted for six sets of steel wire ring net’s slice units,and nonlinear numerical simulations were also performed based on the software LS-DYNA.Tests and simulation revealed the 3-stage working characteristics of out-of-plane puncture force of steel wire ring net.Parametric analysis was further performed considering influences of number of steel wire winding,diameter of ring,area ratio between puncture end and annular mesh,and length width ratio of annular mesh.Then,the analytical calculation method for tensile deformation of annular mesh was proposed,and the correlation equation between puncture force and tensile displacement was established.The study results showed that with increase in number of steel wire winding,the ultimate puncture force increases linearly,and the ultimate tensile displacement decreases slightly and linearly;with increase in diameter of ring,the ultimate puncture force decreases exponentially,and the ultimate tensile displacement increases linearly;with increase in area ratio between puncture end and annular mesh,both the ultimate puncture force and the ultimate tensile displacement decrease continuously in form of power function,and the change rate is basically the same;with increase in length width ratio of annular mesh,both the ultimate puncture force and the ultimate tensile displacement decrease in form of power function,the decrease in the ultimate puncture force is more obvious;the results provide a reference for ring network unit design of flexible protection systems.