We have an electronics module on the JSF where we are required to design for 30 year life or 12,000 hours of operation. Our box has a number of variable components (caps and resistors) that, once the unit is tuned and calibrated for nominal operation, we stake down with RTV. After going through some HASS testing we discovered one circuit that is particularly sensitive to the vibration and the component is drifting, despite the staking. Unfortunetly, we can't use a harder staking material as the component or the unit itself may need to be tuned in the future. As a result, we have begun to look at other compounds that may suffice for holding what is an extremely small screw in place.
Is anyone familar with any materials that have the ability to withstand low pressure, high and low temps, vibration, and retain nearly all of its properties over the 30 year requirement? We have been evaluating glyptal, but there isn't a lot of reliabilty data from the manufacturer. Does anyone have reliability data concerning this substance in an Aerospace application over an extended duty cycle?
Any help would be appreciated...
Thanks,
David James McCann
Mechanical Engineering
Talla-Com Industries
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