Transactions of Materials and Heat Treatment

Title：Influence of material strength difference effect on buffering characteristics for thin-walled metal tube

Authors： Wang Lihong1 2 Guo Yipei1 Niu Ke1 2

Unit： 1. Locomotive and Vehicle College Zhengzhou Railway Vocational & Technical College 2. Henan Engineering Research Center of Rail Transit Intelligent Security

KeyWords： strength difference effect thin-walled metal tube buffering characteristics constitutive model crush-type expansion-type

ClassificationCode：U287.1

year,vol(issue):pagenumber：2025,50(2):75-84

Abstract：

In order to investigate the influence of material strength difference effect on the buffer characteristics of thin-walled metal tubes applied to rail vehicles, the axial compression finite element simulation analysis of thin-walled metal tubes was conducted by Von Mises and CPB06 constitutive models. Firstly, based on the axial notch tension and notch compression test results of commonly used 6082-T6 aluminum alloy for thin-wall metal tubes, Von Mises and CPB06 constitutive models were calibrated for parameters. Secondly, the simulation analysis consistent with experimental conditions was conducted by using the explicit dynamic finite element calculation software LS-DYNA to verify the accuracy of parameter calibration for the constitutive model. Finally, a simulation study was conducted on the axial compression characteristics of a certain crush-type and expansion-type thin-walled metal tubes, and the influence of considering or not considering the material strength difference effect on the response characteristics for the two thin-walled metal tubes was compared. The results show that the material strength difference effect has a significant impact on the deformation characteristics, load characteristics and energy absorption characteristics of crush-type thin-walled metal tube, and the impact on the expansion-type thin-walled metal tube is relatively small.

Funds：

国家自然科学基金资助项目（52175123）；河南省科技攻关计划项目（252102220071，242102320221）

作者简介：王丽红（1980-），女，硕士，副教授,E-mail：honly_lee@sina.com

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