Research On Energy Absorption And Anti-impact Characteristics Of Multi-cellular Square Tube Filled With Aluminum Foam

The energy-absorbing anti-impact component is a critical component of the energy-absorbing anti-impact hydraulic support,which provides support resistance together with the support column under static pressure.When rock burst occurs,it can absorb a large amount of external impact energy through stable deformation,effectively reducing the impact damage of rock burst on tunnels and supports.At present,the main energy-absorbing anti-impact component used is corrugated square tube,which uses the origami principle to add preset crease on ordinary square tube to effectively guide them to produce stable and reliable deformation.However,as a unicellular structure,the support force sharply decreases from the initial peak during plasticity,with a maximum reduction of 60%.The support force is relatively unstable,and the stability of the support force is insufficient.The existing research results show that the deformation stability and energy absorption efficiency of multi-cellular square tubes are better than those of unicellular square tubes,and as a new material,aluminum foam also has excellent energy absorption performance due to its long platform force during deformation.Based on this,this paper proposes a new type of multi-cellular square tube filled with aluminum foam,which conducts research on its energy absorption and anti-impact characteristics,aiming to improve the support capacity and stability of the component during the deformation process.Based on the basic requirements of energy-absorbing anti-impact components,B～G multicellular square tubes are designed on the structure of A type unicellular square tube.According to the improved “SSFE Super Folding Unit” theory and energy absorption theory of foam materials,the average crushing load formula of is derived.The axial impact simulation of A～G square tubes were completed using numerical methods,and the deformation morphology of various square tubes and the load variation law during deformation were studied.Based on the evaluation parameters of energy absorption and anti-impact characteristics,a comparative study was conducted on the energy absorption and anti-shock characteristics of A～G types of square tubes,and it was found that the G-type multi-cellular square tube of 304 stainless steel has better energy absorption and anti-shock characteristics.The G-type multi-cellular square tube of 304 stainless steel was processed using wire cutting technology and subjected to axial quasi-static compression experiment and dynamic impact experiment,respectively.The experimental results were basically consistent with the numerical simulation results.Relevant mechanical property parameters are obtained through axial compression experiment of foam aluminum.The energy absorption and anti-impact characteristics of multi-cellular square tubes filled with aluminum foam under five different filling rates were studied numerically.After the 25% filling rate was determined to be better,the differences of energy absorption and antiimpact characteristics of four different porosity aluminum foam filled multi-cellular square tubes were further studied through numerical simulation and quasi-static compression experiments.Finally,it is concluded that the multi-cellular square tube filled with aluminum foam with 71.18%porosity has good energy absorption and anti-impact characteristics,and compared it with the existing corrugated square tube.The axial impact numerical model of ordinary columns and energy-absorbing columns with multi-cellular square tube filled with aluminum foam were established.A comparative study was conducted on the impact performance of ordinary columns and energy-absorbing columns under different impact energies and velocities from three perspectives: deformation morphology,load changes,and energy absorption.The results show that the impact resistance of the energyabsorbing columns with multi-cellular square tube filled with aluminum foam is significantly stronger than that of the ordinary column.