Buckling ElipticalTube2 angle effect





Author: H. Wieman


Company: LBNL


Date: 14-Jan-05



  1. Introduction
  2. Description
  3. File Information
  4. Materials
  5. Load & Restraint Information
  6. Study Property
  7. Displacement Results
  8. Deformation Results
  9. Design Scenario Results
  10. Mode List
  11. Conclusion
  12. Appendix



1. Introduction



Buckling study of the new STAR beam pipe found that an elliptical pipe had a high buckling factor then a round pipe. Is this an artifact? This study checks to see if there is an angle effect.


2. Description



The angle of the ellipse is varied to see if this changes the load factor.


3. File Information



Model name: ElipticalTube2
Model location: C:\Documents and Settings\Howard Wieman\My Documents\aps project\mechanical\beam pipe\Beryllium Eliptical Stress Study\ElipticalTube2.SLDPRT
Results location: C:\temp
Study name: Ellipse Anlge buckle




4. Materials



No. Shell Name Material Thickness
1 Shell-1 beryilliumCosmosChPois 4 mm
2 Shell-2 beryilliumCosmosChPois 0.5 mm



5. Load & Restraint Information



Restraint
Restraint-1 <> on 1 Edge(s) fixed.
Description:


Load
Pressure-1 <> on 3 Face(s) with Pressure 15 psi along direction normal to selected face
Description:




6. Study Property



Mesh Information
Mesh Type: Shell mesh using surfaces
Mesher Used: Standard
Automatic Transition: Off
Smooth Surface: On
Jacobian Check: 4 Points
Element Size: 5.1625 mm
Tolerance: 0.25812 mm
Quality: High
Number of elements: 2202
Number of nodes: 4434



Solver Information
Quality: High
Solver Type: Direct sparse solver
Number of Buckling Modes: 1








7. Displacement Results



Name Type Min Location Max Location
Plot1 URES: Resultant displacement
0 mm
Node: 46
(-4.79916e-014 mm,
-14.5 mm,
0 mm)
0.347778 mm
Node: 131
(-4.79916e-014 mm,
-14.5 mm,
370.21 mm)



ElipticalTube2-Ellipse Anlge buckle-Displacement-Plot1
JPEG
VIEW



8. Deformation Results



Plot No. Mode Shape Load Factor Scale Factor
1 1 96.566 30



ElipticalTube2-Ellipse Anlge buckle-Deformation-Plot1
JPEG AVI
VIEW
AVI



9. Design Scenario Results



Input Parameters Units Set1 Set2 Set3 Set4 Set5
AspectRatio mm 17.4 17.4 17.4 17.4 17.4
EllipseAngle deg 1 22.5 45 67.5 90




Buckling Load Factor Units Set1 Set2 Set3 Set4 Set5
Result Status Summary Summary Summary Summary Detailed
1 96.562 96.647 96.56 96.654 96.566





ElipticalTube2-Ellipse Anlge buckle-Design Scenario Results-Graph1
JPEG
VIEW






10. Mode List



Mode List
Mode Number Load Factor
1 96.566






11. Conclusion



Conclusion: angle has no effect


12. Appendix



Material name: beryilliumCosmosChPois
Description:
Material Source: Library files
Material Library Name: hwmaterials
Material Model Type: Linear Elastic Isotropic
Unit system: English (IPS)

Property Name Value
Elastic modulus 4.3954e+007 psi
Poisson's ratio 0.27
Shear modulus 1.9583e+007 psi
Mass density 0.066836 lb/in^3
Tensile strength 53673 psi
Yield strength 34815 psi
Thermal expansion coefficient 6.1111e-006 /Fahrenheit
Thermal conductivity 0.0026758 BTU/(in.s.F)
Specific heat 0.43598 Btu/(lb.F)