边界条件对半球壳准静态屈曲行为的影响

发布时间：2018-05-04 13:46

本文选题：半球壳 + 边界条件　；参考：《太原理工大学学报》2016年03期

【摘要】：对304不锈钢半球壳进行了2种边界条件下的准静态压缩实验,实验结果发现了2种不同的变形模态:环扣边界下的变形模态为六边形,自由边界下为五边形。为了探究边界条件对半球壳准静态压缩响应影响的内在规律,利用有限元技术,通过设置壳底部和底板接触摩擦系数的不同,研究了半球壳在3种边界条件下的准静态响应;并对载荷-位移曲线、半球壳变形轮廓图的变化以及顶点位移与加载位移之间的关系进行了比较分析。结果表明,摩擦系数为0.1和0.2时的半球壳压缩过程可以分为顶点压平、轴对称凹陷、非轴对称凹陷和顶点触底后再次压4个阶段;摩擦系数为0.5时,半球壳压缩过程可以分为顶点压平、轴对称凹陷、半球壳底部屈曲3个阶段。
[Abstract]:The quasi-static compression experiments of 304 stainless steel hemispherical shell under two boundary conditions have been carried out. The experimental results show that the deformation modes of 304 stainless steel hemispherical shell are hexagonal and pentagonal under free boundary. In order to explore the inherent law of the influence of boundary conditions on the quasi-static compression response of hemispherical shells, the quasi-static responses of hemispherical shells under three boundary conditions were studied by means of finite element technique and the difference of contact friction coefficient between the bottom and bottom of the shell. The load-displacement curve, the deformation profile of the hemispherical shell and the relationship between the vertex displacement and the loading displacement are compared and analyzed. The results show that the compression process of hemispherical shell with friction coefficient of 0.1 and 0.2 can be divided into four stages: vertex flattening, axisymmetric depression, non-axisymmetric depression and repressing of vertex after bottom contact, and when the friction coefficient is 0.5, The compression process of the hemispherical shell can be divided into three stages: vertex flattening, axisymmetric depression and buckling at the bottom of the hemispherical shell.
【作者单位】：太原理工大学应用力学与生物医学工程研究所;太原理工大学材料强度与结构冲击山西省重点实验室;太原理工大学建筑与土木工程学院;
【基金】：国家自然科学基金资助项目:浆砌多级构建层合壳体的冲击动力学行为研究(11372209) 山西省回国留学人员科研及择优资助项目(2013-044)
【分类号】：O344.1

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