Influence Law and Mechanism of Geometric Parameters on Wrinkling Characteristics of Hollow Aluminum Profiles in Stretch-Bending#br#

doi:10.3969/j.issn.1004-132X.2025.05.020

Abstract

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 mechanism of wrinkling defects in stretch-bending of hollow profiles was revealed and the influences of geometric 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 radii 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 appearance of wrinkling instability. With the increase of thickness-to-height ratio and thickness-to-width ratio 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 increased by adding inner reinforcement rib in the profile cavities， while the wrinkling number increases and the wrinkling height decreases.

Key words: hollow aluminum profile, stretch-bending, wrinkling, geometric parameter, energy criterion

摘要： 基于板壳理论推导了空心铝型材拉弯成形的起皱能和外力做功函数表达式，结合能量准则建立了空心型材拉弯起皱理论预测模型，并通过实验验证了模型的准确性。揭示了空心型材拉弯起皱缺陷的产生机理，定量研究了几何参数对起皱极限及形态的影响。研究结果表明：三种不同弯曲半径下，空心型材起皱数量和高度的理论预测与实验结果吻合性较好，最大差异分别为1.2和0.55 mm，相对误差分别为16.93%和11.28%。弯曲成形阶段的外力做功增速大于起皱能增速，且随弯曲时间的增加，外力做功大于起皱能，导致产生起皱失稳。增大型材厚高比和厚宽比，起皱率降低，起皱极限提高，且起皱数量减少，起皱高度增大；增大型材宽高比，起皱率提高，起皱极限和起皱数量减少，起皱高度增大；在型材型腔增添内加强筋可提高起皱极限，但起皱数量增加，起皱高度减小。

关键词: 空心铝型材, 拉弯, 起皱, 几何参数, 能量准则

CLC Number:

TG376.2

LIU Zhiwen1, 2, LEI Chong1, SUN Kaibo1, OUYANG Basheng1, LI Luoxing2, LIU Xiao3, LI Fazhi1. Influence Law and Mechanism of Geometric Parameters on Wrinkling Characteristics of Hollow Aluminum Profiles in Stretch-Bending#br#[J]. China Mechanical Engineering, 2025, 36(05): 1083-1093.

刘志文1, 2, 雷冲1, 孙凯博1, 欧阳八生1, 李落星2, 刘筱3, 李发智1. 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(05): 1083-1093.

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