摘要
分别采用体单元和壳单元对内压作用下的斜锥壳过渡区进行了参数化有限元分析计算.计算结果表明,采用壳单元与采用体单元相比,最大MISES相当应力的位置及大小几乎不变,但局部薄膜应力的相当应力及薄膜加弯曲应力的相当应力均稍偏大.在所计算的参数范围内,局部薄膜应力的相当应力最大偏差为3.2%,薄膜加弯曲应力的相当应力最大偏差为9.14%.可见在大规模压力容器有限元应力分析中,包括总体结构不连续区在内的大部分区域可采用壳单元代替实体单元进行计算,以节省计算资源用于局部结构不连续区的详细分析.这样可在一次分析中同时得到总体结构不连续区及局部结构不连续区较为准确的数值解.
Taking advantage of FEM,parametric study was done for the knuckle region of the slant conical shell with both shell and solid element model.It is shown that the results of shell element model are in good agreement with that of solid element model for the value and location of the maximum MISES equivalent stress,but a little over evaluates MISES equivalent stresses of the local membrane stress and membrane plus bending stress.Within the considered parameter range,the maximum difference of MISES equivalent stress is 3.2% for the local membrane stress and 9.14% for the mem-brane plus bending stress.So,in large scale FEA of pressure vessels,shell element is a conservative alternative for the stress analysis of main areas including the gross structure discontinuous region to save the computer resources for the local discontinuous regions where efficient solid elements are required.In this way the results can be obtained simultaneous with adequate accuracy for both gross and local discontinuous regions of the structure.
出处
《河北工业大学学报》
CAS
北大核心
2010年第5期29-32,36,共5页
Journal of Hebei University of Technology
基金
天津市自然科学基金(08JCYBJC02400)
河北省自然科学基金(B2008000028)
关键词
斜锥壳
过渡区
有限元
相当应力
单元类型
slant conical shell
knuckle region
FEM
equivalent stress
element type
