薄带材浪形缺陷生成与拉伸矫直过程数值仿真

发布时间：2019-01-22 14:10

【摘要】：基于ABAQUS有限元软件建立了薄带材浪形生成与拉伸过程有限元模型,研究了带材在初应变作用下的浪形缺陷生成规律及其在张力拉伸作用下的应力特性及其变形行为,并进一步分析了浪形缺陷拉伸矫直矫平功效的主要影响因素及其影响规律.薄带钢变形过程可分为浪形生缺陷生成、拉伸矫直和弹性回复三个阶段.针对薄钢带弹性后屈曲浪形和铝带弹塑性后屈曲浪形两类典型浪形形式,研究了浪形缺陷在后屈曲和拉伸变形阶段的浪形陡度变化与系统能量变化规律.研究表明:弹性后屈曲浪形在拉伸矫直过程中浪数和浪高均发生变化,而弹塑性后屈曲浪形仅发生浪高的连续变化.弹性后屈曲浪形矫直后的残余应力分布形式与初始应力分布类似,而弹塑性后屈曲浪形的残余应力分布发生显著差异.浪形缺陷的残余陡度随初始浪形陡度增大而增大,随带厚增加而减小,且弹塑性后屈曲浪形缺陷的矫直效果更为显著.
[Abstract]:Based on the finite element software ABAQUS, a finite element model of wave shape generation and tensile process of thin strip is established, and the forming law of wave shape defect under initial strain and the stress characteristics and deformation behavior of strip under tension are studied. Furthermore, the main influencing factors and their influencing rules of stretching leveling effect of wave defects were analyzed. The deformation process of thin strip can be divided into three stages: wave forming, tensile straightening and elastic recovery. Aiming at the two typical wave forms of elastic post-buckling of thin steel strip and elastic-plastic buckling of aluminum strip, the variation of wave steepness and system energy of wave shape defects in post-buckling and tensile deformation stage are studied. The results show that both the number of waves and the wave height change during the stretch straightening process, but only the continuous changes of the wave height occur in the elastic-plastic post-buckling wave shape. The distribution of residual stress after elastic post-buckling is similar to that of initial stress, but the distribution of residual stress after elastic-plastic buckling is significantly different. The residual steepness of wave-shaped defects increases with the increase of initial wave steepness and decreases with the increase of the thickness, and the straightening effect of elastic-plastic buckling is more obvious.
【作者单位】：北京科技大学机械工程学院;
【基金】：国家自然科学基金资助项目(51075031) 中央高校基本科研业务费专项资金资助项目(2302011FRF-SD-014B)
【分类号】：TG333.23

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