CAJ | 학술논문

对薄壁铝合金管材的充液弯曲进行数值模拟与实验研究;讨论内压与管端约束对成形结果的影响；分析在管端约束的情况下充液弯曲过程中管材典型点的应力状态.结果表明:在充液内压较高的情况下,管材内侧的起皱现象得到减轻；但是,当内压超过管材发生塑性变形的内压时,管材会在弯曲合模过程中被挤出型腔.由于管端约束而产生的拉应力抵消了弯曲过程中内侧的压应力,管端约束情况下弯曲质量更好.
대박벽려합금관재적충액만곡진행수치모의여실험연구;토론내압여관단약속대성형결과적영향；분석재관단약속적정황하충액만곡과정중관재전형점적응력상태.결과표명:재충액내압교고적정황하,관재내측적기추현상득도감경；단시,당내압초과관재발생소성변형적내압시,관재회재만곡합모과정중피제출형강.유우관단약속이산생적랍응력저소료만곡과정중내측적압응력,관단약속정황하만곡질량경호.
The hydro-bending of thin-walled aluminum tube was researched by numerical simulation and experiments.The effects of internal pressure and tube ends constraint were analyzed.The stress state of symbol point during bending process was analyzed with tube ends constrain.The results show that wrinkling behavior is lightened when the tube is bent under higher pressure.But if the pressure exceeds the plastic deformation pressure,the tube will be pushed out of the die during the die-closing process.The bending quality is improved with tube ends constraint.The reason is that the inner tensile stress produced due to the constrained tube ends impairs the compressive stress in the inner arc of bending.