Waterproofing strain gages for low ambient temperatures
Abstract
Due to recent problems experienced with strain-gage based transducers immersed in water at below-freezing ambient temperatures, a test program was conducted to determine if commercially available strain-gage waterproofing systems could withstand these conditions. A total of 96 combinations of eight waterproofing systems, three beam materials, and four strain gage adhesives were evaluated. Test environments included strain cycling at temperatures from -32 F to -75 F and freeze-thaw cycling from -35 F to -90 F. Only one waterproofing system withstood all tests with no failures. Other results ranged from one installation failure on three systems to the failure of all 12 installations of one system.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- September 1978
- Bibcode:
- 1978STIN...7919323G
- Keywords:
-
- Low Temperature Environments;
- Strain Gages;
- Transducers;
- Waterproofing;
- Adhesives;
- Cantilever Beams;
- Failure Analysis;
- Underwater Engineering;
- Instrumentation and Photography