工程科学学报
工程科學學報
공정과학학보
Journal of University of Science and Technology Beijing
2015年
6期
789-798
,共10页
带钢%板形缺陷%残余应力%矫直%有限元法%塑性
帶鋼%闆形缺陷%殘餘應力%矯直%有限元法%塑性
대강%판형결함%잔여응력%교직%유한원법%소성
strip steel%flatness defects%residual stress%straightening%finite element method%plastic
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。
基于ABAQUS有限元軟件建立瞭薄帶材浪形生成與拉伸過程有限元模型，研究瞭帶材在初應變作用下的浪形缺陷生成規律及其在張力拉伸作用下的應力特性及其變形行為，併進一步分析瞭浪形缺陷拉伸矯直矯平功效的主要影響因素及其影響規律。薄帶鋼變形過程可分為浪形生缺陷生成、拉伸矯直和彈性迴複三箇階段。針對薄鋼帶彈性後屈麯浪形和鋁帶彈塑性後屈麯浪形兩類典型浪形形式，研究瞭浪形缺陷在後屈麯和拉伸變形階段的浪形陡度變化與繫統能量變化規律。研究錶明：彈性後屈麯浪形在拉伸矯直過程中浪數和浪高均髮生變化，而彈塑性後屈麯浪形僅髮生浪高的連續變化。彈性後屈麯浪形矯直後的殘餘應力分佈形式與初始應力分佈類似，而彈塑性後屈麯浪形的殘餘應力分佈髮生顯著差異。浪形缺陷的殘餘陡度隨初始浪形陡度增大而增大，隨帶厚增加而減小，且彈塑性後屈麯浪形缺陷的矯直效果更為顯著。
기우ABAQUS유한원연건건립료박대재랑형생성여랍신과정유한원모형，연구료대재재초응변작용하적랑형결함생성규률급기재장력랍신작용하적응력특성급기변형행위，병진일보분석료랑형결함랍신교직교평공효적주요영향인소급기영향규률。박대강변형과정가분위랑형생결함생성、랍신교직화탄성회복삼개계단。침대박강대탄성후굴곡랑형화려대탄소성후굴곡랑형량류전형랑형형식，연구료랑형결함재후굴곡화랍신변형계단적랑형두도변화여계통능량변화규률。연구표명：탄성후굴곡랑형재랍신교직과정중랑수화랑고균발생변화，이탄소성후굴곡랑형부발생랑고적련속변화。탄성후굴곡랑형교직후적잔여응력분포형식여초시응력분포유사，이탄소성후굴곡랑형적잔여응력분포발생현저차이。랑형결함적잔여두도수초시랑형두도증대이증대，수대후증가이감소，차탄소성후굴곡랑형결함적교직효과경위현저。
ABSTRACT A mathematical model to describe the wave-shaped defect generation and stretching process of thin strips is established by using ABAQUS to study the stress characteristics and deformation behavior of strips under initial strain. Influencing factors on the straightening effect are analyzed in the tension straightening process. The deformation process of wave-shaped defects is divided into a generation phase, a stretching stage, and an elastic recovery phase. The elastic-buckling wave of thin steel strips and the elastic-plastic-buckling wave of aluminum strips as two typical wave-shaped forms are focused on to investigate the change of wave steepness and system energy. During the process of tension straightening, the number and height of the elastic-buckling wave both change, while the height of the elastic-plastic-buckling wave does continuously only. After straightening, the residual stress distribution of the elastic-buckling wave is similar to the initial stress distribution, while the residual stress distribution of the elastic-plastic-buckling wave makes a significant difference. The steepness of the residual wave increases with the increase of initial wave steepness and decreases with the increase of strip thickness. The straightening effect of the elastic-plastic-buckling wave is more significant.
