轴向冲击下方形纸管的能量吸收性能和理论模型

Energy Absorption Performance and Theoretical Model of Square Paper Tube Under Axial Impact

为了研究薄壁方形纸管在轴向冲击下的力学响应和能量吸收性能,利用落锤冲击试验机和万能材料试验机进行了动态冲击和准静态压缩试验。方形纸管在动态冲击试验和准静态压缩试验中具有相似的渐进压溃变形模式。试验结果显示,方形纸管的比能量吸收和单位体积能量吸收能力与管件的边长和壁厚比(c/h)相关。随着管件c/h的增大,管件比能量吸收和单位体积能量吸收能力迅速减小。同时,本文分析了管件在冲击过程中的压溃力与冲击速度的关系。最后,本文建立了方形纸管轴向冲击下的能量吸收性能理论模型,理论模型与试验结果具有很好的相关性,该模型为薄壁纸管结构应用到冲击防护装置设计提供了理论支撑。

To investigate the impact response and energy absorption performance of thin-walled square paper tube under axial impact,dynamic impact and quasi-static compression tests were carried out by drop hammer testing machine and universal material testing machine.The square paper tube has a similar progressive crushing collapse mode in dynamic impact test and quasi-static compression test.The test results show that the specific energy absorption and energy absorption capacity per unit volume of the square paper tube are related to the side length and wall thickness ratio(c/h)of the tube.With the increase of c/h,specific energy absorption and volumetric energy absorption capability of the paper tube decrease rapidly.Furthermore,the relationship between the crushing force and the impact velocity during the impact process is analyzed.Finally,a theoretical model of energy absorption performance of the square paper tube under axial impact is proposed,which has a good correlation with the test results.The proposed model can contribute to the application of paper tube to the design of impact protection structure.