题目
悬臂梁仅受到向下的重力作用，计算该梁在自重作用下的变形。弹性模量为2.1×10^11Pa，泊松比为0.3，梁长2米，重力加速度为9.8m/s^2，密度为7800kg/m^3，梁的截面形状如图所示。要求：选用BEAM188单元，该梁整个划分20个单元。
Main Menu>Preprocessor
>Element Type>Add/Edit/Delete>Add>Beam>2 node 188
>Material Props>Material Models>Structural>Linear>Elastic>EX:2.1e11, PRXY:0.3
>Material Props>Material Models>Structural>Density>DENS:7800
>Section>Beam>Common Sections>Sub-Type:工, W1:0.2, W2:0.2, W3:0.2, t1:0.03, t2:0.03, t3:0.03
>Modeling>Create>Keypoints>In Active CS>NPT:1, X:0, Y:0, Z:0; NPT:2, X:2, Y:0, Z:0
>Modeling>Create>Lines>Lines>Straight Line
>Meshing>Size Cntrls>Manual Size>Global>Size>NDIV:20
>Meshing>Mesh>Lines
Utility Menu>Plot Ctrls
>Style>Size and Shape>Display of element:on
Main Menu>Solution
>Define Loads>Apply>Structural>Displacement>On Nodes
>Define Loads>Apply>Structural>Inertia>Gravity>Global>ACEL Z:9.8
>Solve>Current LS
Main Menu>General Postproc
>Read Results>First Set
>Plot Results>Deformed Shape>KUND:Def + undeformed
>Plot Results>Contour Plot>Nodal Solu>DOF Solution>Displacement vector sum>Undisplaced shape key:Deformed shape with undeformed model
>Plot Results>Contour Plot>Nodal Solu>Stress>von Mises stress>Undisplaced shape key:Deformed shape with undeformed model
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