Design And Energy Absorbing Properties Research On Diameter Expanding Energy Absorbing Components Of Straight Corrugated Tube

With the continuous increase of mining intensity in coal industry,rock burst accidents occur frequently,and the hydraulic support equipment can play an effective role in anti impact support.However,when the impact load comes,because the safety valve of the hydraulic column can not be opened in time for unloading,the hydraulic column is still in the state of rigid support and can not achieve rigid flexible coupling support,It is very necessary to design a kind of energy absorbing component which can play the role of constant resistance giving way to improve the impact resistance of anti impact support equipment.In this paper,the energy absorption characteristics of energy absorbing components are studied theoretically and experimentally.Based on the principle of plastic deformation,the theoretical calculation formula of the average resistance is derived by using the energy method,and the main parameters affecting the average resistance are obtained,which are the wall thickness of the straight tube,the number of corrugations,the half diameter of corrugations,the material properties,and the radius of the big end of the punch cone;In this paper,the energy absorption characteristics of the straight corrugated tube expanding type energy absorption component are studied.According to the main parameters affecting the average resistance,the dynamic simulation and harmonic response analysis of the energy absorption component are carried out by using ABAQUS finite element simulation software in the way of control variables.The stress nephogram,harmonic response nephogram,force displacement curve and energy displacement curve of the energy absorption component are obtained.By analyzing the stress nephogram of each stage,it is found that the stress in most regions is less than the strength limit of the material in the process of expanding deformation,and the energy absorbing members with different parameters have stable deformation modes.By analyzing the harmonic response nephogram,it is found that the energy absorbing component is prone to resonance in a specific frequency range.By analyzing the force displacement curve and energy displacement curve,it is found that the mechanical properties and energy absorption performance of the straight corrugated tube expanding energy absorbing component can reach the expected.In this paper,an indoor experiment is carried out on the expanded diameter energy absorbing component.The experimental results are compared with the theoretical calculation results and the simulation analysis results,and the reasons for the differences are analyzed.Through the above research,this paper obtains the average load,peak load,total energy absorption,load fluctuation coefficient and stroke efficiency of the straight corrugated tube expanding energy absorbing component through simulation analysis and indoor experiment.The results show that the expanding deformation process and resistance change trend of the improved energy absorbing component are corresponding to the energy absorption situation,and the resistance is constant while the absorbed energy increases linearly when the expanding deformation is stable,The theoretical formula is in good agreement with the simulation and experimental results.It is an effective way to get the required deformation resistance by changing the wall thickness of the ruled tube.Through the expanding experiment of the ruled tube with the same specification and the thin-walled circular tube,it is found that the mechanical properties and energy absorption performance of the ruled tube are better than those of the thin-walled circular tube.Therefore,the expanded energy absorption component of the ruled tube is an ideal energy absorption component in the field of anti impact support.