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NEW STRESS CALCULATIONS


This table summarizes the calculations of the maximum stresses incurres for several glue types and glue joint thicknesses.

run DESCRIPTION delta% RH Max
stress (psi)
Silicon
stress (psi)
Sa=5000
Foam
stress (psi)
Sa=325
MVDG Model in previous memo
6mm thick x 74mm long
rigid bond
50% 6941 6689
AD1 control case
rigid bond
50% 6746 6477
AD2 Araldite (Sa = 4800 psi)
0.005" thick
50% 6763 6319 129
AD3 RTV (Sa = 510 psi)
0.005" thick
30% 4797 4797 98
AD4 Araldite
0.005" thick
Reduced delta%RH
30% 4058

3792

77

AD5 Araldite
0.005" thick
Reduced thickness
30% 4056 3839 79

The emphasized numbers show that for this combination (AD4) of hard, strong epoxy and finite thickness of 130 um, stresses in both the silicon and the foam are well below their respective failure points.


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