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Solidworks Simulation
Welded Cover for a sealed
Microwave electronics assembly
linear elastic stress analysis
D. Blanchet 10/19/2015
Fixed edges
Light blue
1 atmosphere internal
Pressure loading
On this surface
Refined graded mesh
in high stress zones
Aluminum 4047 alloy
Aluminum 4047 alloy stepped seal cover design used for laser welding
Microwave hermetic Seal cover stress analysis
For this study assume yield strength = 12,000 psi
1,380,000 degrees of freedom
10 node tetrahedral solid elements
Isosurface >= 12,000 psi
Local yielding
Probable in
Red zones
Linear Elastic
deformation
High stress zones – deformation shown @ 120X
A nonlinear analysis may predict permanent deformation values.
An accurate stress strain curve for 4047 aluminum alloy is required.
Linear Analysis Cases
Altitude, feet Pressure
Differential, psi
Maximum
Stress, psi
Volume of
material above
12,000 psi yield
0 (leak test) 14.7 internal 86,700 2.6 %
30,000 10.0 57,850 0.9 %
50,000 12.8 74,000 1.7 %
0 (BOM test) 14.7 external 85,000 2.5 %

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Microwave hermetic Seal cover stress analysis

  • 1. Solidworks Simulation Welded Cover for a sealed Microwave electronics assembly linear elastic stress analysis D. Blanchet 10/19/2015
  • 2. Fixed edges Light blue 1 atmosphere internal Pressure loading On this surface Refined graded mesh in high stress zones Aluminum 4047 alloy
  • 3. Aluminum 4047 alloy stepped seal cover design used for laser welding
  • 5. For this study assume yield strength = 12,000 psi 1,380,000 degrees of freedom 10 node tetrahedral solid elements
  • 6. Isosurface >= 12,000 psi Local yielding Probable in Red zones
  • 8. High stress zones – deformation shown @ 120X A nonlinear analysis may predict permanent deformation values. An accurate stress strain curve for 4047 aluminum alloy is required.
  • 9. Linear Analysis Cases Altitude, feet Pressure Differential, psi Maximum Stress, psi Volume of material above 12,000 psi yield 0 (leak test) 14.7 internal 86,700 2.6 % 30,000 10.0 57,850 0.9 % 50,000 12.8 74,000 1.7 % 0 (BOM test) 14.7 external 85,000 2.5 %