棱边强化薄壁方管静动态轴压理论和仿真研究*

doi:10.19562/j.chinasae.qcgc.2019.04.016

Abstract

Abstract: This paper aims to study the static and dynamic axial crushing of ridgeline strengthened thin-walled square tube. Firstly, the choosing method of the energy-equivalent flow stress in the formula of static mean crushing force for ridgeline strengthened square tube and its effects on theoretical prediction results are analyzed. Then the formula for dynamic mean crushing force is derived based on Cowper-Symonds empirical formula. Meanwhile, the finite element models for 440A original and ridgeline strengthened square tubes subjected to static and dynamic axial crushing are built with Hypermesh 9.0, and a simulation is conducted to reconstruct its plastic deformation process with the fluctuation of crushing force, and the results well agree with theoretical values with a maximum deviation less than 4%. Finally, several 35 steel square tubes with plastic strain strengthened ridgelines are fabricated for conducting static crushing test, verifying the validation of the static mean crushing force formula with a 7.1% derivation from the theoretical value. This study provides some references for the strength design of ridgeline strengthened thin-walled square tubes and their application in vehicle body structures.

Key words: thin-walled square tube, ridgeline strengthening, numerical simulation, mean crushing force, crushing test

Zheng Yuqing, Zhu Xichan , Ma Zhixiong. Theoretical and Simulation Study on the Static and Dynamic Axial Crushing of Ridgeline Strengthened Thin-walled Square Tubes[J].Automotive Engineering, 2019, 41(4): 468-474.

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Theoretical and Simulation Study on the Static and Dynamic Axial Crushing of Ridgeline Strengthened Thin-walled Square Tubes

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