薄壁压力容器在内压作用下的弹塑性屈曲行为研究  

Plastic Buckling of Internal Pressurized Torispherical Pressure Vessel

作　　者：张彤[1] 汤国伟[1] 殷雅俊[2] 

机构地区：[1]北京航空航天大学航空学院固体力学研究所,北京100191 [2]清华大学航天学院固体力学研究所,北京100084

出　　处：《压力容器》2010年第3期17-25,共9页Pressure Vessel Technology

基　　金：国家自然科学基金项目(No.10602028和No.10572076);中国科学院非线性力学开放基金

摘　　要：基于ABAQUS对受内压薄壁压力容器的屈曲行为进行计算时,采用非对称的网格剖分是打破对称性、诱发分叉屈曲的有效方法。与在结构中引入初始缺陷的传统做法相比,该法具有更加客观真实,且不破坏原始结构的优势。通过一系列的数值试验,揭示薄壁压力容器在内压作用下的弹塑性屈曲规律。计算结果表明,在内压作用下薄壁压力容器过渡区域出现波状的分叉屈曲形态,随着加载的继续,过渡段将逐渐生成肉眼可视的褶皱。通过与试验结果以及传统方法对比,非对称网格剖分方式可以更加简单而有效地诱发结构的分叉屈曲行为,且与试验结果吻合较好。Asymmetric Mesh Technology is an effective way to break symmetry and to induce the bifurcation buckling for simulating the buckling behavior of torispherical shell under internal pressure by ABAQUS.The method is more objective and real,and does not destroy the original structure,comparing with the traditional one for introducing initial imperfections.A series of numerical experiments have been developed in this article to find out the law of plastic buckling of internal pressurized pressure vessel.The results show that： as the internal pressure increased above some critical value,a wave like band had appeared in the knuckle region.After formation of the wave like deformation the pressure can be further increased substantially,causing the formation of visible buckles in the knuckle region.Comparing with the experiment and traditional method,asymmetric mesh technology can induce the bifurcation buckling behavior more simply and effectively.Moreover,the results are in good agreement with the experimental values.

关 键 词：压力容器 分叉屈曲 数值试验 非对称网格剖分 

分 类 号：TQ051.3[化学工程]