摘要
建立了分布式位移加载方式拉伸成形的有限元模型,对该方法成形三维曲面进行位移加载路径设计。对球形件和鞍形件的成形过程进行了数值模拟,对比分析离散加载点数以及加载时间步数对于成形件应力应变分布的影响。结果表明,离散加载点数越多,应变分布越均匀,成形质量越好;加载时间步越多,板料成形区应力变化幅度越小,应力应变分布越均匀,成形效果越好,但是当加载时间步到达一定数值后,随着加载时间步的增加,成形件应力应变分布变化不明显。最后通过实验验证这种拉伸成形方法的可行性。
A finite element model of stretch forming was established based on distributed displacement loading and the displacement loading trajectory of forming the three-dimensional surface was designed.Spherical parts and saddle parts were selected for simulation,the effects of the number of discrete loading points and loading time-steps on the stress and strain distribution on the formed part were analyzed comparatively.Results show that the more discrete loading points,the higher uniformity of the strain distribution and the better forming quality;and the more loading time-steps,the smaller variation of the stress magnitude and the better forming quality.However,when the loading timestep reaches a certain value,there were no obvious changes in the stress and strain distributions with further increase in the loading time-step.Experiment results demonstrate to feasibility of proposed displacement loading method.
出处
《吉林大学学报（工学版）》
EI
CAS
CSCD
北大核心
2016年第1期199-204,共6页
Journal of Jilin University:Engineering and Technology Edition
基金
国家自然科学基金项目(51575231)
关键词
材料合成与加工工艺
拉伸成形
分布式位移加载
加载路径
数值模拟
materials synthesis and processing technology
stretch forming
distributed displacement loading
loading trajectory
numerical simulation
