基于Neuber公式的焊接制造对运载火箭储箱承载力的影响

林一桐; 王东坡; 王颖

基于Neuber公式的焊接制造对运载火箭储箱承载力的影响

天津大学材料科学与工程学院, 天津 300072;天津大学天津市现代连接技术重点实验室, 天津 300072

基金项目: 国家自然科学基金资助项目(51275343)

计量
- 文章访问数: 607
- HTML全文浏览量: 6
- PDF下载量: 489
出版历程
- 收稿日期: 2014-04-07

Effect of welding on bearing capacity of launch vehicle tank based on Neuber formula

School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China;Tianjin Key Laboratory of Advanced Joining Technology, Tianjin 300072, China

摘要

摘要: 利用Neuber公式对大型运载火箭的2219铝合金储箱液压过程中能够承受的内压力进行估算. 其中,接头微区的力学性能通过微小力学试验得到,不同结构模型接头焊趾处的弹性理论应力集中系数通过线弹性有限元法得到. 最后将微区力学性能代入有限元模型进行弹塑性计算,验证Neuber公式计算贮箱承载力的精度. 对比发现,在承载力预测中,接头局部的力学性能以及几何缺陷引起的应力集中情况都会严重影响结构的承载力,极端危险条件下的应力集中系数可以达到5.156,而承载压力仅有1.21 MPa,为无焊缝时承载力的37.81%;Neuber公式的应力误差为8.5%,应变误差为2.3%,其估算结构承载力的精度比较高.
- Neuber公式 /
- 2219铝合金储箱 /
- 焊接制造 /
- 承载力 /
- 有限元法
Abstract: The maximum internal pressure in large launch vehicle tank made of 2219 aluminum alloy in the process of liquid bulge test was estimated according to Neuber formula. The small-area mechanical property of the joint was tested through micro-mechanical tests. The theoretical elastical stress concentration factor of welded toes at different structural models was obtained by linear-elastic finite element method. Finally, the small-area mechanical properties were adopted in the finite element model and the elastic-plastic structural analysis was carried out to verify the accuracy of Neuber formula in the calculating the bearing capacity of the tank. By comparison, the predicted local mechanical properties and stress concentration caused by geometrical defects seriously affect the bearing capacity of structure. Under extremely hazardous condition, the stress concentration factor could reach 5.156, and bearing capacity was only 1.21 MPa, as 37.81% of that one without weld. The stress variation of neuber formula was 8.5% and the strain variation was 2.3%, so the precision of Neuber formula is relatively high to estimate the bearing capacity of structure.
- Neuber formula /
- tank of 2219 aluminum alloy /
- welding manufacturing /
- bearing capacity /
- finite element method

HTML全文

参考文献(7)

[1]	从保强, 齐铂金, 周兴国, 等. 2219高强铝合金超快变换VPTIG焊缝组织和性能[J]. 焊接学报, 2010, 31(4): 85-88. Cong Baoqiang, Qi Bojin, Zhou Xingguo, et al. Microstructure and mechanical properties of ultrafast-convert VPTIG arc welding of 2219 high strength aluminum alloy[J]. Transactions of the China Welding Institution, 2010, 31(4): 85-88.
[2]	孟庆国, 方洪渊, 徐文立, 等. 2219铝合金双丝焊热影响区组织及力学性能[J]. 焊接学报, 2006, 27(3): 9-12. Meng Qingguo, Fang Hongyuan, Xu Wenli, et al. Microstructure and mechanical properties of 2219 Al-alloy heat-affected zone with twin wire welding[J]. Transactions of the China Welding Institution, 2006, 27(3): 9-12.
[3]	王春炎, 曲文卿, 姚君山, 等. 2219-T87铝合金搅拌摩擦焊接头组织与力学性能[J]. 焊接学报, 2010, 31(10): 77-80. Wang Chunyan, Qu Wenqing, Yao Junshan, et al. Microstructures and mechanical properties of friction stir welded 2219-T87 aluminum alloy joints[J]. Transactions of the China Welding Institution, 2010, 31(10): 77-80.
[4]	Neuber H. Theory of stress concentration for shear-strained prismatical bodies with arbitrary nonlinear stress-strain law[J]. Journal of Applied Mechanics, 1961, 28: 544.
[5]	王井科, 杨晓光. 各向异性多轴近似应力应变分析方法研究及应用[J]. 航空动力学报, 2012, 27(6): 1230-1237. Wang Jingke, Yang Xiaoguang. Study and application on anisotropic multiaxial approximate stress and strain analysis method[J]. Journal of Aerospace Power, 2012, 27(6): 1230-1237.
[6]	仰建岗, 王秉纲, 陈拴发. 基于修正Neuber方程的沥青路面裂缝形成疲劳寿命预估方法[J]. 交通运输工程学报, 2007, 7(2): 50-54. Yang Jiangang, Wang Binggang, Chen Shuanfa. Estimating method of fatigue life during cracking initiation of asphalt pavement based on modified Neuber equation[J]. Journal of Traffic and Transportation Engineering, 2007, 7(2): 50-54.
[7]	贾安东. 焊接结构与生产[M]. 2版. 北京: 机械工业出版社, 2007.

施引文献

资源附件(0)

计量

文章访问数: 607
HTML全文浏览量: 6
PDF下载量: 489
被引次数: 0

基于Neuber公式的焊接制造对运载火箭储箱承载力的影响

计量

出版历程

Effect of welding on bearing capacity of launch vehicle tank based on Neuber formula

计量

出版历程

目录