Study on mechanical properties of ring-brake energy dissipaters in passive flexible protection systems
The ring-brake energy dissipaters is an important energy-dissipating device in the passive flexi-ble protection system,and the in-depth study of the force-displacement relationship of the ring-brake ener-gy 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 dissi-paters under dynamic load was simulated,and the sensitivity of the steel pipe wall thickness,steel pipe di-ameter,steel pipe ring diameter,aluminum sleeve length,aluminum sleeve thickness and preload to the pa-rameters 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 dissi-paters,but if the aluminum sleeve thickness is too small it will easily lead to tearing damage of the sleeve.
Ring-brake energy dissipatersNumerical simulationForce-displacement curvesSimplify fit-ting parametersEnergy dissipation
万方数据
维普
