Ansys Tutorial 3
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CE 6131 Finite Element Lab , 3 rd Feb 2014, Plane Stress/ Plane Strain/ Axissymmetric elements Dr. Amirtham Rajagopal Elastic Modulus = 30 E6 psi , Thickness of plate =0.1 Analyze a square plate (edge length= 4in) with a hole at the center (radius = 1in) and four corner bolt holes (diameter =0.25 in). The plate is subjected to pressure load on the two opposite sides and is bolted through the bolt holes. Taking advantage of symmetry a one quadrant model is shown in the figure. The appropriate boundary conditions along symmetric sides are also shown in figure. Preprocessing: Defining the Problem 1. Give the Simplified Version a Title Utility Menu > File > Change Title> Plate Model 2. Set up the Graphics Area Workplane Workplane Settings> Grid and Triad > Snap Incr[0.125] Spacing [0.125] Minimum [-2] 2in 1.5in 1in X Y 10 Lb/in 10 Lb/in No x- displacement No y- displacement
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Transcript of Ansys Tutorial 3
CE 6131 Finite Element Lab , 3rd Feb 2014, Plane Stress/ Plane Strain/ Axissymmetric elements
Dr. Amirtham Rajagopal
Elastic Modulus = 30 E6 psi , Thickness of plate =0.1
Analyze a square plate (edge length= 4in) with a hole at the center (radius = 1in) and four corner bolt
holes (diameter =0.25 in). The plate is subjected to pressure load on the two opposite sides and is
bolted through the bolt holes. Taking advantage of symmetry a one quadrant model is shown in the
figure. The appropriate boundary conditions along symmetric sides are also shown in figure.
Preprocessing: Defining the Problem
1. Give the Simplified Version a Title
Utility Menu > File > Change Title> Plate Model
2. Set up the Graphics Area
Workplane
Workplane Settings> Grid and Triad > Snap Incr[0.125]
Spacing [0.125]
Minimum [-2]
2in
1.5in
1in
X
Y 10 Lb/in 10 Lb/in
No x- displacement
No y- displacement
Maximum [2]
OK
Work plane > Display Work plane
Plot Cntrls> View Settings> Magnification> DVAL > User Specified [1.5] >OK
Plot Cntrls> View Settings> Focus Point> XF > User Specified> XF, YF, ZF> [-1][1][0] >OK
3. ANSYS Main menu > Preference > Structural> h – method>OK
4. Begin the solid model by creating one 2x2 square
ANSYS Main Menu
Preprocessor> Modeling> Create> Areas> Rectangle > By Dimensions
RECTNG
[ X1, X2=(0,-2)]
[Y1, Y2=(0,2)]
OK
5. Create the large circle at the corner of the square
ANSYS Main Menu
Preprocessor>Modeling> Create>Areas> Circle> Solid Circle> [WPX =0,
WPY=0)]>[r=1]>OK
6. Create the bolt hole circle
ANSYS Main Menu
Preprocessor > Modeling >Create>Areas> Circle> Solid Circle> [WPX =-1.5,
WPY=1.5)]>[r=0.125]>OK
7. Substract the two circles from the main area to form the model
ANSYS Main Menu
Preprocessor>Modeling>Operate>Booleans>Substract>Areas>Pick on Sqaure area>
Large right circle> Small Left Circle>OK
8. ANSYS Utility Menu> Work Plane > Display Workplane
ANSYS Tool Bar> SAVE_DB
9. Define the element type ( Quad 4 node Plane 182)
Preprocessor>Element Type>Add/Edit/Delete> Add >Library of Element
types>Structural>Solid>Quad 4node Plane 182>OK
Options>Plane 182 element type Options> K3[Plane Str.w thk] OK> Close
Preprocessor>Real Constants> add>Real constants for plane 182> THK[0.1] > OK.
Preprocessor>Material Properties>Constant> Isotropic> OK
Isotropic Material Properties> EX [30E6] > OK.
10. Specify an Element Size and Mesh the solid Model
ANSYS Main Menu
Preprocessor> Meshing Shape and Size> Lines >Picked lines > Box
Create a box that contains the small circle
OK> NDIV[2]> OK ( divide every 90 degree arc in to 2 segements)
Preprocessor > Meshing – Shape and Size > Manual Size . Global > Size Global Element
size> SIZE [0.1] OK.
Preprocessor> Meshing > Mesh > Areas > Free > Pick ALL > OK.
ANSYS Utility Menu> Plot>Elements
ANSYS Tool Bar > Save_DB
11. Apply displacement constraints around the small hole and symmetry boundary conditions
ANSYS utility Menu
Plot controls> Numbering > plot numbering controls> KP> ON> OK.
Plot Lines>
ANSYS Main Menu
Preprocessor> Loads- Loads Apply> Structural > Displacement> on Keypoints> Select the
Four Keypoints around the small hole.
Apply U, ROT, and KPs > Lab 2 [All DOF]KEXPND> Yes>OK
Preprocessor>Loads> Loads- Apply> structural – Displacements> Symmetry BCs > On
lines> Select the bottom line of the model> OK.
Preprocessor > Loads > Loads- Apply> structural – Displacements> Symmetry BCS > On
Lines > The right vertical line of the model.> OK.
Preprocessor > Loads > Loads- Apply> structural- Pressure> On lines> The left vertical
line where the pressure is applied.
Apply PRES on lines > VAL1 [-10] > OK.
12. Confirm the applied loads by obtaining the listings and displaying load symbols; then save the
data base.
ANSYS Utility Menu
List>Loads> DOF Constraints>on All Keypoints
File> close
List> Loads> Surface Loads>On All Lines
File > Close
Plot Cntrls> Symbols > [/PBC] > All Applied BCS > OK
ANSYS Tool bar > Save _ DB.
13. Initiate the Solution
ANSYS Main Menu > Solution > Solve> Current LS> OK
14. Reviewing the results using the General Post Processor
ANSYS Main Menu
General Post Processor> Plot Results > Deformed Shape > KUND> def + Undef> OK
Plot Results > Contour Plot > Nodal Solution > Contour Nodal Solution Data > Stress > Von
Misses Equiv > OK.
Example 2. Analyse the plate shown in Figure using 4 noded Plane 182 Elements.
E= 210Gpa, Niu=0.2, Edge DE Pressure = 1000KN/mm , EDGE ABC is completely restrained because of
the Bolt in the hole of radius 25mm. Use plane stress case.
Determine the maximum displacement, maximum stresses . Plot the distribution of stresses along a line
passing through AC that cuts the plate in to two parts.
Example 3.
Using plane strain elements analyse the stress distribution on the walls of a cylindrical pipe subjected to
internal pressure of 500 Mpa. Pipe E = 210 Gpa. Internal diameter = 50mm External Diameter =150mm.
Example 4. Solve example 3 using Axis Symmetric elements and compare the results with those
obtained from 3
50mm
50mm
250mm
120mm
25mm 25mm
100mm
15mm radius
25mm
25mm
35mm
25mm radius
45mm
125mm A
C
B
D
E
