• 先进材料加工工程 •

### A6061薄壁圆锥管轴向压缩性能的数值分析和理论研究

1. 1.福建工程学院机械与汽车工程学院，福州,350118
2.福建省力值计量测试重点实验室，福州，350003
3.福州大学机械工程及自动化学院，福州，350116
• 出版日期:2022-07-25 发布日期:2022-08-02
• 通讯作者: 周兴洋，男，1995年生，硕士研究生。研究方向为薄壁管件的抗冲击吸能性能。E-mail:1224122843@qq.com。
• 作者简介:韦铁平，男，1984年生，副教授、博士。研究方向为薄壁管件的抗冲击吸能性能、复杂工程结构的仿真分析。E-mail:tpwei@fjut.edu.cn。
• 基金资助:
国家自然科学基金(11972005);国家质检总局科技计划(2015QK117)；福建省力值计量测试重点实验室开放课题(FJLZSYS202104)；福建省自然科学基金(2021J011050)

### Numerical Analysis and Theoretical Studies of Axial Compression Behavior of A6061 Thin-walled Conical Tubes

WEI Tieping1,2;ZHOU Xingyang1;GUO Jinquan3;ZENG Shoujin1;YE Jianhua1;YANG Xiaoxiang3

1. 1.School of Mechanical and Automotive Engineering,Fujian University of Technology,Fuzhou,350118
2.Fujian Key Laboratory of Force Measurement,Fuzhou,350003
3.School of Mechanical Engineering and Automation,Fuzhou University,Fuzhou,350116
• Online:2022-07-25 Published:2022-08-02

Abstract: The axial compression simulation of conical tubes, which had cone inclination from 0° to 40° and wall thickness from 1mm to 2.5 mm, LS-DYNA software was applied to study the influences of cone inclination and wall thickness on the energy absorption characteristics and deformation law of conical tubes. In addition, the instantaneous load correction formula for the wide range of the cone inclination angle(15°~40°) was proposed based on the instantaneous load collapse model of Mamalis conical tube. The results show that the critical angle of the deformation mode is 15°, but the deformation mode is in the stacked mode when the cone inclination is less than 15° and it is in the nested mode when the angle is greater than 15°. Moreover, with the increase of the cone angle, the average load and the specific energy absorption decreases gently, while the initial peak load decreases significantly. It should be noted that with the increase of wall thickness, the crushing mode must transform from the diamond mode into the annular symmetry mode while the average load, the initial peak load and the specific energy absorption increase. The simulation results illustrate that the Mamalis instantaneous load formula is modified by the Pearson correlation coefficient analysis method and the maximum error is less than 10% between the modified value and the simulation value, In addition, the accuracy of the modified formula was verified by the experiments. In brief, the correction formula provides a theoretical basis for revealing the mechanism of crushing of thin-walled tubes with large-scale tapered inclination.