应变强化后容器的外压屈曲分析  

Buckling Analysis of Cold-stretched Vessels under External Pressure

作　　者：陈希[1] 郑津洋[1,2,3] 缪存坚[1] 高晓哲[1] 惠培子 丁会明[1] 

机构地区：[1]浙江大学化工机械研究所,浙江杭州310027 [2]高压过程装备与安全教育部工程研究中心,浙江杭州310027 [3]流体动力与机电系统国家重点实验室,浙江杭州310027

出　　处：《压力容器》2015年第8期14-20,6,共8页Pressure Vessel Technology

基　　金：中国博士后科学基金(2014M551731)

摘　　要：在应变强化过程中,容器会发生塑性变形。为了解该变形对于容器外压稳定性的影响,确立了全面考虑强化影响的非线性屈曲分析方法,并选择不圆度作为初始几何缺陷,进行理想容器和含初始不圆度容器在强化前后的屈曲求解,通过比较屈曲载荷、屈曲模态以及载荷位移曲线的变化来探究应变强化过程对容器外压稳定性的影响规律。结果表明,建立的容器模型的屈曲载荷具有很强的不圆度敏感性;含初始不圆度的容器强化后的屈曲载荷提高,外压稳定性增强;应变强化过程可改善容器圆度,提高容器制造过程中壳体初始不圆度的最大允许值。Plastic deformation occurred when vessels were cold-stretched. In order to figure out the influ- ence of the deformation of cold-stretching on stability of vessels under external pressure, this paper estab- lished the nonlinear buckling analysis method which could take all the influence into consideration, chose out of roundness as initial geometric imperfection form of vessels, and performed the buckling analyses of perfect vessels and vessels with initial out-of-roundness before and after the process of cold-stretching, to analyze the influence that the process of cold-stretching brought to the stability of vessels by comparing the change of the buckling load, the buckling mode and the load-displacement curves. The results show that the buckling load of vessels established in this paper are strongly sensitive to out-of-roundness. The buck- ling load of vessels with out-of-roundness increases after cold-stretching. Consequently, the stability of ves- sels under external pressure also increases. Furthermore, the process of cold-stretching can improve the roundness of the vessels and increase the maximum allowable value of out of roundness during the process of producing of manufacturing.

关 键 词：应变强化 外压稳定性 不圆度 非线性屈曲 

分 类 号：TH49[机械工程—机械制造及自动化] O343.5[理学—固体力学]