练习一：ANSYS上机习题(2008new) - 解释

Project6 超静定梁的有限元建模计算

计算分析模型如图6-1 所示, 习题文件名: statically indeterminate beam

梁承受均布载荷：1.0e5 Pa lm lm 图6－1 超静定梁的计算分析模型

6.1 进入ANSYS

程序 →ANSYSED 6.1 →Interactive →change the working directory into yours →input Initial jobname: statically indeterminate beam→Run 6.2设置计算类型

ANSYS Main Menu: Preferences →select Structural → OK 6.3选择单元类型

ANSYS Main Menu: Preprocessor →Element Type→Add/Edit/Delete →Add →select Beam tapered 44 →OK(back to Element Types window) →Close (the Element Type window)

6.4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

6.5定义截面

ANSYS Main Menu: Preprocessor →Sections →Beam →Common Sectns →定义矩形截面:ID=1,B=0.01,H=0.1 →OK

6.6生成几何模型 ? 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(1,0),3(2,0),4(0,0,1) →OK

? 生成梁

ANSYS Main Menu: Preprocessor →Modeling →Create →Lines →lines →Straight lines →依次连接三个特征点，1(0,0), 2(1,0),3(2,0) →OK

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? 显示梁体

ANSYS命令菜单栏：PlotCtrls >Style >Size and Style →/ESHAPE →On →OK 6.7 网格划分

ANSYS Main Menu: Preprocessor →Meshing →Mesh Attributes →Picked lines →OK →拾取: SECT:1；Pick Orientation Keypoint(s):YES→拾取：4#特征点(0,0,1) →OK→Mesh Tool → (Size Controls) lines: Set →Pick All(in Picking Menu) →input NDIV:8 →OK (back to Mesh Tool window) → Mesh →Pick All (in Picking Menu) → Close (the Mesh Tool window)

6.8 模型施加约束

? 分别给1,2,3三个特征点加约束

ANSYS Main Menu: Solution →Define Loads →Apply →Structural →Displacement → On Keypoints →拾取1,2,3 keypoints →OK →select All DOF → OK

? 施加y方向的载荷

ANSYS Main Menu: Solution →Define Loads →Apply →Structural →Pressure → On Beams →Pick All →LKEY:2,VALI:100000 →OK

说明：LKEY:2,表示是沿着y方向施加的分布力 LKEY:1,表示是沿着z方向施加的分布力

同学们可以把查看施加后的压力开关打开，从而根据实际情况选择加载的方向。

表示施加压力的方向 可缺省，缺省表示与I节点的压力为0 可缺省，缺省表示与I节点的压力相同，即为均布力

6.9 分析计算

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ANSYS Main Menu: Solution →Solve →Current LS →OK(to close the solve Current Load Step window) →OK

6.10 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

6.11 退出系统

ANSYS Utility Menu: File→ Exit →Save Everything→OK

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Project7 平板的有限元建模与变形分析

计算分析模型如图7-1 所示, 习题文件名: plane

0.5 m 板承受均布载荷：1.0e5 Pa 0.5 m 0.5 m

图7－1 受均布载荷作用的平板计算分析模型

0.5 m

7.1 进入ANSYS

程序 →ANSYSED 6.1 →Interactive →change the working directory into yours →input Initial jobname: plane→Run 7.2设置计算类型

ANSYS Main Menu: Preferences →select Structural → OK 7.3选择单元类型

ANSYS Main Menu: Preprocessor →Element Type→Add/Edit/Delete →Add →select Solid Quad 4node 42 →OK (back to Element Types window) → Options… →select K3: Plane stress w/thk →OK→Close (the Element Type window)

7.4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

7.5定义实常数

ANSYS Main Menu: Preprocessor →Real Constants… →Add… →select Type 1→ OK→input THK:1 →OK →Close (the Real Constants Window)

7.6生成几何模型 ? 生成特征点

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