弯管扁平化的平面应力分析及相对弯曲半径  

Plane-stress analysis of the bended-tube flattening and relative bending-radius

作　　者：鄂大辛[1] 王险峰[2] 

机构地区：[1]北京理工大学机械与车辆工程学院,北京100081 [2]名古屋工业大学

出　　处：《塑性工程学报》2007年第4期25-28,共4页Journal of Plasticity Engineering

基　　金：北京市重点学科基金项目(XK00070424);国防预研项目

摘　　要：在管材弯曲试验研究的基础上,对弯管横截面形状变化现象进行了变形分析。认为,横截面形状变形沿弯管轴线非均匀分布,弯曲中央靠近起弯侧形状变化较大,短轴变化率可作为确切反映弯管横截面扁平化的工程指标。在平面应力假设条件下,推导出受横截面长、短轴变化率影响的最小相对弯曲半径的近似计算公式,并通过部分小直径管的无芯弯曲试验和有限元模拟计算,初步证明了该公式具有一定的准确性,经过进一步修正后,可望应用于生产。In the systemic study of tube-bending deformation, the experiment and analysis, aiming at the phenomenon of the shape distortion of the bended-tube cross-section, are carried out. It is pointed out that shape deformation of the tube cross-section is not uniform distribution along the axis line of the bended-tube, the shape tending to start-bending-side in the bending center area changes greatly, the change-ratio of short axis is comparatively obvious, which can be taken as the engineering index exactly reflected the flattening of the bended-tube cross-section. Based on the assumption of the plane-stress, the approximate calculation formula of the minimum relative bending-radius, which is influenced by the change-ratio of long and short axes of the cross-section, is deduced. Through partial experiments and FEM calculation of small-diameter-tube bending without mandret, the formula with certain accuracy is preliminarily proved, and it can be used in practice through further amendment.

关 键 词：管材弯曲 平面应力 横截面畸变 长、短轴变化比 

分 类 号：TG386.3[金属学及工艺—金属压力加工]