FEA Tutorials BK1

BA-1. Buckli ng Pipe  Pipe 

midas FEA Training Series

Overview

BK-1. Buckling Pipe 

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3-D Linear Buckling Analysis Model - Unit Unit : N, N, mm - Isotropic Isotropic Elastic Elastic Material  Material  - Plate Plate Element  Element 

Load & Boundary Conditions - Pressu Pressure re - Constra Constraint  int  Result Evaluation - Buckling Buckling Mode Mode Shapes Shapes

BA-1. Buckli ng Pipe 

midas FEA Training Series

Step 1. 1. Analysis > A nalysis Contr ol  – “Control” tab 2. Anal ysi s Type : 3D  3. Cli ck

But ton (Un it System)

4. L ength : mm 2

5. Click [OK] Button  6. Click [OK] Button 

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5 6

 Anal ysis

Control Di alog is automatically activated at startu p.

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BA-1. Buckli ng Pipe 

midas FEA Training Series

Step 2. 1. Geometry > Primitive Feature > Cylinder…

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2. C1 : Center X YZ (0, 0, -100)  Radius : 20  H eight : 200 

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3. Click [Apply] Button  4. C2 : Center X YZ (0, 0, 0)  Radius : 10  H eight : 150  5. Click [OK] Button 

6. Click “Zoom All” 

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BA-1. Buckli ng Pipe 

midas FEA Training Series

Step 3.

 face … 1. Geometr y > Remove > Sub-  2. Select Top & Bottom Faces of 2 Solids marked by “ O” (See Figure) 3. Click [OK] Button  2

BA-1. Buckli ng Pipe 

midas FEA Training Series 1. Geometry > Transform > Rotate …

Step 4.

2. Select Pipe marked by “ O” (See Figure) 3. Revoluti on Axi s : Y-axis  4. An gle (90)  5. Click [Apply] Button  2 3

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“Enter” as shortcut for “Apply”.

BA-1. Buckli ng Pipe 

midas FEA Training Series

Step 5. 1. Select Pipe marked by “ O” (See Figure) 2. Revolu tion A xi s : Y-axis 

Uniform Copy”  3. Option : “Non-  4. Angl e (45, -90) 

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5. Click [OK] Button 2

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BA-1. Buckli ng Pipe 

midas FEA Training Series

Step 6.

1. Geometry > Shape Color … 2. Select

“Displayed” 

3. Color Type : Random Col or  2

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“Ctrl+A” as shortcut for “Select Displayed”.

4. Click [OK[ Button 

BA-1. Buckli ng Pipe 

midas FEA Training Series 1. Geometry > Surface > Trim 2 Surfaces …

Step 7.

2. Change Selection Filter to “Shell (H)”  3. Sel ect Pi pe1 

4. Change Selection Filter to “Shell (H)”  3, 7

5. Sel ect Pi pe2 

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6. Click [Apply] Button  7. Repeat steps 2-6 f or Pipe3 & 4  Pipe1 

Pipe2 

2, 4 Pipe3 

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7 Pipe4 

BA-1. Buckli ng Pipe 

midas FEA Training Series

Step 8.

1. Cli ck Right M ouse Butt on on Work Wi ndow 

2. Select “Move Work Plane …” 3. Select “Tran & Rot” Tab

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4. Translati on : Dz (100)  5. Click [OK] Button 

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BA-1. Buckli ng Pipe 

midas FEA Training Series

1. Geometry > Curve > Create on WP > Circle …

Step 9.

2. Locati on : (0), (10)  3. Click [Cancel] Button

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“Esc” as shortcut for “Cancel”.

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BA-1. Buckli ng Pipe 

midas FEA Training Series

Step 10. 1. Geometry > Surface > Create > Plane Face … 2. Select 5 Cur ves (See F igur e)  2

3. Cli ck [OK] Button 

BA-1. Buckli ng Pipe 

midas FEA Training Series

1. Geometr y > Tr ansfor m > Translate - “Direction & Distance” tab

Step 11.

2. Select Face (See F i gur e)  3. Di rection : Z-axis 

4. Check on “Non -  Uniform Copy” 

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5. Di stance : (- 30, -140)  2 3

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6. Click [OK] Button 

BA-1. Buckli ng Pipe 

midas FEA Training Series 1. Select Face1 (See F igur e) 

Step 12.

2. Press “Delete” key 3. Click [OK] Button 

4. Geometry > Surface > Fuse … 5. Select

“Displayed”

6. Name : Pipe  7. Click [OK] Button 

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Face1 

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1

BA-1. Buckli ng Pipe 

midas FEA Training Series 1. Mesh > Auto Mesh > Face …

Step 13.

2. Select

“Displayed” 

3. M esher : Gr id M esher , Type : Quad+Tr ia  4. M esh Size : Element Size (3)  5. Proper ty (1)  6. M esh Set : Pipe  3

7. Click [ OK] B utton  8. Pre-Works Tr ee : Geometr y 

9. Click Right Mouse Button & Select “Hide All”  4

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BA-1. Buckli ng Pipe 

midas FEA Training Series

1. Analysis > Property …

Step 14.

2. Create 2D …

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3. Select “Plate” tab 4. I D : 1 , Name : Pipe 

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5. T or T1 : 1 mm  5

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6. Click

Button (M ateri al) 

7. Cli ck [Create] Button  16

8. Select “Isotropic” tab

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9. I D : 1 , Name : M at Pipe 

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10. Elastic M odulus : 2.1e5 2  N/mm 

11. Poisson’s Ratio : 0.3

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12. Weigh t D ensity : 7.77e-5 3  N/mm  13. M odel Type : E lastic 

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14. Cli ck [OK] Button  15. Cli ck [Close] Button 

16. Select “1: Mat Pipe” for Material  17. Cli ck [OK] Button  15 14

18. Cli ck [Close] Button 

BA-1. Buckli ng Pipe 

midas FEA Training Series 1. Analysis > BC > Constraint …

Step 15.

2. BC Set : BC 

3. Click “Front View”  3

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4. Sel ect 40 N odes (See F igur e)  5. Click [Fixed] Button 

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6. Click [OK] Button 

BA-1. Buckli ng Pipe 

midas FEA Training Series 1. Analysis > Load > Pressure …

Step 16.

2. L oad Set : Pr essur e  3. Type : Edge Pressure  4. Object Type : 2D E lement Edge 

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5. Select 40 El ement Edges (See F i gur e) 

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6. Di rection : Normal 

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7. P or P1: 1 N/mm  8. Cli ck [OK] Button 

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BA-1. Buckli ng Pipe 

midas FEA Training Series

1. Analysis > Analysis Case …

Step 17.

2. Cli ck [Add] Button  2

3. Name : Buckli ng  4. Anal ysis Type : L in ear B uckli ng  5. Cli ck

But ton (An alysis Control ) 

6. Number of M odes : 5  10

7. Cli ck [OK] Button 

8. Drag & Drop “Load” to “Used” Window 9. Cli ck [OK] Button 

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10. Cli ck [Close] Button  5

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BA-1. Buckli ng Pipe 

midas FEA Training Series

Step 18.

1. File > Save… (Pipe.feb) 2. Analysis > Solve … 3. Cli ck [OK] Button 

4. Post > Buckling Load Factor … 2

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5. Cli ck [OK] Button