中国机械工程2025，Vol.36Issue(5)：1083-1093,11.DOI:10.3969/j.issn.1004-132X.2025.05.020
几何参数对空心铝型材拉弯起皱特性的影响规律及机理
Influence Law and Mechanism of Geometric Parameters on Wrinkling Characteristics of Hollow Aluminum Profiles in Stretch-Bending
摘要
Abstract
Based on the plate and shell theory,the expression of wrinkling energy and external force work functions of hollow aluminum profiles in stretch-bending were derived.Combined with the energy criterion,the theoretical prediction model of wrinkling was established for hollow profiles in stretch-bending and the accuracy of model was verified by bending experiments.The formation mecha-nism of wrinkling defects in stretch-bending of hollow profiles was revealed and the influences of geo-metric parameters on wrinkling limit and morphology were quantitatively studied.The results show that the theoretical predictions of the number and height of wrinkling under three different bending ra-dii are in good agreement with those of the experimental ones.The maximum differences are as 1.2 and 0.55 mm,respectively,with relative errors of 16.93%and 11.28%,respectively.The growth rate of external force work in the bending stages is greater than that of wrinkling energy.With the increase of bending time,the external force work is greater than the wrinkling energy,resulting in the appear-ance of wrinkling instability.With the increase of thickness-to-height ratio and thickness-to-width ra-tio of the profiles,the wrinkle ratio and wrinkling number decrease,while the wrinkling limit and wrinkling height increase.With the increase of the aspect ratio,the wrinkle ratio and wrinkle height increase,while the wrinkling limit and wrinkling number decrease.The wrinkling limit might be in-creased by adding inner reinforcement rib in the profile cavities,while the wrinkling number increases and the wrinkling height decreases.关键词
空心铝型材/拉弯/起皱/几何参数/能量准则Key words
hollow aluminum profile/stretch-bending/wrinkling/geometric parameter/energy criterion分类
矿业与冶金引用本文复制引用
刘志文,雷冲,孙凯博,欧阳八生,李落星,刘筱,李发智..几何参数对空心铝型材拉弯起皱特性的影响规律及机理[J].中国机械工程,2025,36(5):1083-1093,11.基金项目
国家自然科学基金(52005244,52205376) （52005244,52205376）
湖南省自然科学基金(2021JJ30573,2019JJ50510) （2021JJ30573,2019JJ50510）
汽车车身先进设计制造国家重点实验室开发基金(31715011) （31715011）
