ANSYS轴对称问题实例

1、ansys,2,ansys轴对称问题注意问题,1、单元：plane2、plane42、plane82、plane182、plane183、shell51（模拟轴对称壳,2、平面单元需要单元设置：keyopt（3）为axisymmetric,3、y轴必须是旋转对称轴（x轴是径向、z轴是周向,4）轴对称问题集中力和集中力矩的输入和输出总是360度的合力和合力矩,3,shell51轴对称壳单元,两个节点，每个节点有4个自由度。（ux、uy、uz、rotz,对称轴必须为y轴，x轴为径向，且为非负,需要定义厚度，可为线性，厚度大时，应选择plane42单元,4,如图所示是一飞轮的截面图。飞轮的材料为弹性

2、模量210gpa，泊松比为0.27，密度为7800kg/m3。飞轮的角速度为62.8rad/s，飞轮边缘受压力作用，压力p为1mpa,飞轮轴孔固定，试进行静力分析,5,1、分析类型,静力分析,2、问题描述,轴对称问题,3、ansys单位,mm n mpa g ms,4、单元,plane82：8节点四边形（每个节点个自由度,5、材料,弹性模量、泊松比、密度,6,1、飞轮实体建模（略,7,2、飞轮有限元模型的建立,1）材料参数,ansys main menu: preprocessor material props material models structural linear elastic

3、 isotropic input ex:2.10e5, prxy:0.27 ok,ansys main menu: preprocessor material props material modelsdensity input dens:0.0078 ok,8,2、飞轮有限元模型的建立,2）单元选择,ansys main menu: preprocessor element typeadd/edit/delete add select solid quad 8node 82 ok (back to element types window) options selelt k3: axisym

4、metric close (the element type window,9,2、飞轮有限元模型的建立,3）划分网格,ansys main menu: preprocessor meshing mesh tool （size controls) global: set input size:1 ok,mesh tool mesh : select areas shape:quadfree mesh pick all close( the mesh tool window,10,3、施加约束和载荷,1）施加约束和压力,ansys main menu: solution define loads

5、 apply structural displacement on lines 拾取左边 ok select lab2:all dof ok,ansys main menu: solution define loads apply structural pressure on lines 选择图示的三条边 如下页图输入ok,11,12,3、施加约束和载荷,2）施加角速度,ansys main menu: solution define loads apply structural inertia angular veloc globel弹出施加角速度的对话框，如下图输入（注意单位,13,4、求

6、解,ansys main menu: solution solve current ls ok(to close the solve current load step window) ok,5、后处理,1）改变观察输出结果坐标系,ansys main menu: general postproc options for output 出现结果坐标系设置对话框，设置为柱坐标系，如图,14,5、后处理,2）径向位移云图,ansys main menu: general postproc plot results contour plot nodal solu select: dof soluti

7、on, x-component of displacement ok,3）周向位移云图,ansys main menu: general postproc plot results contour plot nodal solu select: dof solution, z-component of displacement ok,3）轴向位移云图,ansys main menu: general postproc plot results contour plot nodal solu select: dof solution, y-component of displacement ok

8、,15,5、后处理,5）径向应力云图,ansys main menu: general postproc plot results contour plot nodal solu select: dof solution, x-component of stress ok,6）周向应力云图,ansys main menu: general postproc plot results contour plot nodal solu select: dof solution, z-component of stress ok,7）轴向应力云图,ansys main menu: general postproc plot results contour plot nodal solu select: dof solution, y-component of stress ok,16,5、后处理,8）等效应力云图,mainmenugeneral postprocplot results-contour plot-nodal solu。弹出的对话框中的左下拉框内选