摘要
研究了薄壁管在高压成形过程中的屈曲、起皱失稳现象,通过对所建立的弹塑性屈曲(全局屈曲)和起皱(局部屈曲)模型的分析计算,获得了管子屈曲、起皱的初始条件、临界载荷和临界应力计算公式。研究表明,屈曲和起皱的产生取决于几何参数,如相对半径r0/l0和相对厚度d0/r0等,且对长管而言,屈曲是主要的失稳形式,但对于短管,起皱则是主要的失稳形式,薄壁管内压对薄壁管起皱、屈曲没有影响。
Some instability models in internal high pressure forming （IHPF）：wrinkling, buckling and bursting, through the theoretical analysis of wrinkling and buckling under nonuniform inner- pressure,the elastic-plastic model of wrinkling （global buckling） and that of buckling （local buckling） were established. The calculational formulas about the initial conditions, the critical loading and the critical stress of the tube wrinkling and buckling were gained. It indicates that onset of the wrinkling and buckling depends on geometrical parameters, e.g. r0/l0 ,d0/ro ,and that wrinkling is the main instability model to long tubes while buckling is the main model to short tubes. The inner--pressure of the thin walled--tube has no influence on wrinkling and buckling of the tube. This conclusion has its important theoretical meaning and engineering value in internal high pressure forming （IHPF）.
出处
《中国机械工程》
EI
CAS
CSCD
北大核心
2007年第11期1363-1366,共4页
China Mechanical Engineering
基金
河北省自然科学基金资助项目(502177)
关键词
内高压成形
起皱
屈曲
弹塑性分析
internal high pressure forming
buckling
wrinkling
elastic-plastic analysis
