Analysis of strain neutral layer displacement in tube-bending process

被引：18

作者：

E, Daxin ^{[1
]}

Guo, Xuedong ^{[2
]}

Ning, Ruxin ^{[1
]}

机构：

[1] School of Material Science and Engineering, Beijing Institute of Technology

[2] Department of Mechanics, Jilin University

来源：

Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | 2009年 / 45卷 / 03期

关键词：

Relative bending radius; Strain neutral layer; Tube-bending; Tube-wall thickness;

D O I：

10.3901/JME.2009.03.307

中图分类号：

学科分类号：

摘要：

In the series study of the tube-bending deformation, in order to reveal the deformation mechanism of tube bending and promote the rapid development of accurate tube bending and digital bending technology, the approximate calculation formulae of the strain neutral layer radius and the thickness attenuation of outer-lateral tube-wall are deduced on the basis of the plate-bending theory and under the plane strain conditions, and the changes of the strain neutral layer along radius are analysed with the consideration of the thinning of thickness of outer-lateral tube-wall. Given that the ratio of the strain neutral layer radius and bending radius is smaller than 1, it is proved that the strain neutral layer moves towards the bending center during the process of tube-bending. In addition, it is pointed that the amount of movement towards center of the strain neutral layer is inversely proportional to the relative bending radius. According to the comparison between the tube-bending test and finite element simulation results, the calculation of tube-wall thinning is proved to be relatively accurate, but since it does not include the effects of deformation perpendicular to the direction of the bending plane in material property parameters, the calculated value is on the high side and needs further modification.

引用

页码：307 / 310

页数：3

共 10 条

[1]

E D., The study on the law of plastic-deformation of tube bending without mandrel, Journal of Plasticity Engineering, 13, 1, (2006)

[2]

E D., Ning R., Tang C., Et al., The experiment and analysis of the spring-back of the rotary-drawing tube bending, Journal of Beijing Institute of Technology, 26, 5, (2006)

[3]

E D., Ning R., Gu T., Experiment and analysis on the distortion of cross-section of bended-tube, Acta Armamentall, 27, 4, pp. 698-701, (2006)

[4]

Gu T., E D., Ren Y., Et al., Finite element simulation and experimental analyses of the wall thickness deformation in the process of pipe-bending, Die and Mould Industry, 4, pp. 17-20, (2006)

[5]

Yu T., Zhang L., Plastic Bending Theory and It's Application, (1992)

[6]

Stechpwicz F., Bending with upsetting of copper tube elbows, Journal of Materials Processing Technology, 100, pp. 236-240, (2000)

[7]

E D., Mizuno T., Li Z., Stress analysis of rectangular cup drawing, Journal of Materials Processing Technology, 205, pp. 469-476, (2008)

[8]

E D., Ning R., Tang C., Et al., The study on the experiment of wall thickness deformation of coreless bended small-diameter tube, Journal of Plasticity Engineering, 12, 2, (2005)

[9]

E D., Ning R., Li Y., Et al., Experimental study on the wall thickness thinning of the curved tube affected by material property, Materials Science and Technology, 12, 2, pp. 200-203, (2008)

[10]

E D., Ning R., Minimum relative bending-radius of the tube-bending without mandrel, Chinese Journal of Mechanical Engineering, 43, 5, pp. 219-222, (2007)

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