梁的有限元建模与变形分析
梁的有限元建模与变形分析计算分析模型如图1-1 所示, 习题文件名: beam。
NOTE:要求选择不同形状的截面分别进行计算。
图1-1梁的计算分析模型
梁截面分别采用以下三种截面(单位：m)：
矩形截面： 圆截面： 工字形截面：
B=0.1, H=0.15 R=0.1 w1=0.1，w2=0.1，w3=0.2,
t1=0.0114，t2=0.0114，t3=0.007
1.1 进入ANSYS
程序 →AnsysED 6.1 →Interactive →change the working directory into yours →input Initial jobname: beam→Run
1.2设置计算类型
ANSYS Main Menu: Preferences →select Structural → OK
1.3选择单元类型
ANSYS Main Menu: Preprocessor →Element Type→Add/Edit/Delete… →Add… →select Beam 2 node 188 →OK (back to Element Types window) →Close (the Element Type window)
1.4定义材料参数
ANSYS Main Menu: Preprocessor →Material Props →Material Models →Structural →Linear→Elastic →Isotropic →input EX:2.1e11, PRXY:0.3 → OK
1.5定义截面
ANSYS Main Menu: Preprocessor →Sections →Beam →Common Sectns →分别定义矩形截面、圆截面和工字形截面：矩形截面:ID=1,B=0.1，H=0.15 →Apply →圆截面：ID=2,R=0.1 →Apply →工字形截面：ID=3,w1=0.1，w2=0.1，w3=0.2，t1=0.0114，t2=0.0114，t3=0.007 →OK
1.6生成几何模型
ü 生成特征点
ANSYS Main Menu: Preprocessor →Modeling →Create →Keypoints →In Active CS →依次输入三个点的坐标：input:1(0,0),2(10,0),3(5,1) →OK
ü 生成梁
ANSYS Main Menu: Preprocessor →Modeling →Create →Lines →lines →Straight lines →连接两个特征点，1(0,0),2(10,0) →OK
1.7 网格划分
ANSYS Main Menu: Preprocessor →Meshing →Mesh Attributes →Picked lines →OK →选择: SECT:1(根据所计算的梁的截面选择编号);Pick Orientation Keypoint(s):YES→拾取：3#特征点(5,1)→OK→Mesh Tool →Size Controls) lines: Set →Pick All(in Picking Menu) →input NDIV:5 →OK(back to Mesh Tool window) → Mesh →Pick All (in Picking Menu) → Close (the Mesh Toolwindow)
1.8 模型施加约束
ü 最左端节点加约束
ANSYS Main Menu: Solution →Define Loads →Apply →Structural →Displacement → On Nodes→pick the node at (0,0) → OK → select UX, UY,UZ,ROTX → OK
ü 最右端节点加约束
ANSYS Main Menu: Solution →Define Loads →Apply →Structural →Displacement → On Nodes→pick the node at (10,0) → OK → select UY,UZ,ROTX → OK
ü 施加y方向的载荷
ANSYS Main Menu: Solution →Define Loads →Apply →Structural →Pressure → On Beams→Pick All →VALI:100000 → OK
1.9 分析计算
ANSYS Main Menu: Solution →Solve →Current LS →OK(to close the solve Current Load Step window) →OK
1.10 结果显示
ANSYS Main Menu: General Postproc →Plot Results →Deformed Shape… → select Def + Undeformed →OK (back to Plot Results window) →Contour Plot →Nodal Solu →select: DOF solution, UY, Def + Undeformed , Rotation, ROTZ ,Def + Undeformed→OK
1.11 退出系统
ANSYS Utility Menu: File→ Exit →Save Everything→OK
转自：http://blog.sina.com.cn/s/blog_4cc7ed19010009pl.html
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