The Measurement of Dimensional Stability of Invar Using Strain-Gage Techniques.
AEROSPACE CORP EL SEGUNDO CALIF MATERIALS SCIENCES LAB
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The use of Micro-Measurements Type WK-00 strain gates for the measurement of the room-temperature dimensional stability of Invar was investigated. One-half inch diameter Invar rods 0.05 C, 36.2 Ni were subjected to four heat treatments, which had been reported to produce highly stable Invar components. Microstrain measurement system capabilities are outlined in terms of resolution and stability. Detection of plus or minus 0.2 counts per microstrain strain instabilities after 1000 hr is possible with sufficient consideration of adhesives, bridge components, and measurement laboratory temperature stability.
- Metallurgy and Metallography