microwave hermetic seal cover stress analysis
TRANSCRIPT
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
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 %