被动柔性防护系统中减压环力学性能研究  

Study on mechanical properties of ring-brake energy dissipaters in passive flexible protection systems

作　　者：艾庆华[1] 王一鸣 AI Qinghua;WANG Yiming(State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学省部共建交通工程结构力学行为与系统安全国家重点实验室,河北石家庄050043

出　　处：《甘肃科学学报》2024年第6期50-57,共8页Journal of Gansu Sciences

基　　金：国家重点研发计划项目(2021YFB2600605,2021YFB2600600);中央引导地方科技发展资金项目(216Z5402G);河北省重点研发计划项目(22346101D)。

摘　　要：减压环是被动柔性防护系统中重要的耗能装置,深入研究减压环力-位移关系对减压环设计和被动柔性防护系统性能具有重要意义。基于“等能量”原则,提出一种减压环力-位移关系双折线简化模型的方法。考虑材料非线性和几何非线性的影响,采用LS-DYNA软件建立减压环有限元模型,模拟了减压环在匀速动荷载作用下的拉伸过程,研究了钢管壁厚、钢管管径、钢管环径、铝套筒长度、铝套筒厚度和预紧力大小等因素对双折线模型参数第一刚度、第二刚度及屈服强度的影响,并给出了3个参数的拟合公式。研究表明,改变钢管壁厚、管径或环径会有效改变减压环的力学性能和耗能能力,改变铝套筒的长度或厚度对减压环的力-位移曲线影响较小,但过小的铝套筒厚度容易导致套筒发生撕裂破坏。The ring-brake energy dissipaters is an important energy-dissipating device in the passive flexible protection system,and the in-depth study of the force-displacement relationship of the ring-brake energy dissipaters is of great significance for the design and the performance of the passive flexible protection system.Based on the principle of "equal energy",this paper proposes a method of bi-polyline simplified model of ring-brake energy dissipaters force-displacement relation.Considering the influence of material nonlinearity and geometric nonlinearity,the finite element model of the ring-brake energy dissipaters was established by LS-DYNA software,the mechanical process of tensioning of the ring-brake energy dissipaters under dynamic load was simulated,and the sensitivity of the steel pipe wall thickness,steel pipe diameter,steel pipe ring diameter,aluminum sleeve length,aluminum sleeve thickness and preload to the parameters of the double polygonal model was studied,and the fitting formula of the three parameters was given.The results show that changing the wall thickness,pipe diameter or ring diameter of the steel pipe will effectively change the stiffness of the ring-brake energy dissipaters,and then have a great impact on the force-displacement curve of the ring-brake energy dissipaters,and changing the length or thickness of the aluminum sleeve will have little effect on the force-displacement curve of the ring-brake energy dissipaters,but if the aluminum sleeve thickness is too small it will easily lead to tearing damage of the sleeve.

关 键 词：减压环 数值模拟 力-位移曲线 简化拟合参数 耗能 

分 类 号：O242.21[理学—计算数学] U213.8[理学—数学]