摘要
为研究蛋形耐压壳在不同数值模型下的屈曲特性,首先,建立理想蛋形耐压壳数值模型,研究单元尺寸对其强度与屈曲的影响;在此基础上,引入非线性与一阶模态缺陷,分别研究蛋形耐压壳在这两种情况下的屈曲特性影响规律.结果表明:单元尺寸对蛋形耐压壳的强度影响小,屈曲影响大;非线性与模态缺陷对耐压壳的稳定性影响大,二者对临界屈曲载荷下降的贡献度分别达到56.27%、13.47%,故进行蛋形耐压壳数值分析时应将其列入考虑范围,保证耐压壳安全稳定性.
Buckling behavior of the egg-shaped pressure hull in different numerical models was studied in this paper. Firstly,the perfect numerical model of the egg-shaped pressure hull was proposed,and the effect of element size on strength and buckling was investigated. On this basis,nonlinear and the first mode imperfection were introduced,and buckling behavior of egg-shaped pressure hull under the two conditions was further studied respectively. The results show that element size has little influence on strength,but a large influence on buckling. In addition,both of the nonlinear Riks method and mode imperfection have a significant effect on stability of the egg-shaped pressure hull,and their contribution degree leading to decrease of critical elastic buckling load is 56. 27% and 13. 47%,respectively. Therefore,it is essential to take nonlinear Riks method and mode imperfection into account when the numerical analysis is carried out,so as to ensure the stability of pressure hull.
出处
《江苏科技大学学报（自然科学版）》
CAS
北大核心
2017年第4期413-417,426,共6页
Journal of Jiangsu University of Science and Technology:Natural Science Edition
基金
国家自然科学基金资助项目(51205173)
江苏省基础研究计划青年基金资助项目(BK20150469)
关键词
蛋形耐压壳
屈曲特性
模态缺陷
非线性
egg-shaped pressure hull
buckling behavior
mode imperfection
nonlinear
