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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.
Based on the ABAQUS finite element software, the finite element model of the strip forming and drawing process was established. The formation rules of the strip defects under the initial strain of the strip and its stress characteristics under tension and tension and its deformation Behavior and further analyzed the main factors affecting the straightening and leveling effect of wave-shaped defects and their influence laws.The deformation process of strip steel can be divided into three stages: the formation of wave-shaped defects, the stretching and straightening and the elastic recovery. Two types of typical wave forms, elastic postbuckling and aluminum strip elastic postbuckling, are studied. The variation of the wave steepness and the system energy during the post-buckling and tensile deformation phases are studied. The results show that the wave number and wave height of the elastic post-buckling wave in the straightening and straightening process both change, while the elastic-plastic post-buckling wave forms only the continuous variation of the wave height.The residual stress after elastic post-buckling wave straightening The distribution of stress distribution is similar to that of the initial stress, but there is a significant difference in residual stress distribution of the elastic-plastic post-buckling wave.The residual steepness of the wave-shaped defect increases with the steepness of the initial wave and decreases with the increasing of the belt thickness Plastic Straightening effect of post-buckling wave defects is more pronounced.