MEASUREMENT OF RUBBER ELASTICITY AT LOW TEMPERATURES USING A TWIST RECOVERY APPARATUS
Technical rept. Jul 1964-Jun 1965
ARMY NATICK LABS MA CLOTHING AND ORGANIC MATERIALS LAB
Pagination or Media Count:
The apparatus and methods described in the report provide a new means of observing and measuring the low -temperature behavior of rubber. Since, in actual use, rubber is very often deformed only slightly, the new method subjects the test specimen to a twist deformation of 360 degrees, resulting in an elongation of approximately 5 percent along its side. The apparatus permits twist recovery and percentage of set to be measured at specific constant temperatures and also to be correlated with rising temperatures. The results show that, with the exception of a series of ethylene propylenediene EPD rubber compounds, both the elasticity and the flexibility of rubbers are regained within the same range of low temperatures. The stress-strain behavior of EPD rubbers, which differs from that of other types of rubber, is briefly discussed. These techniques can be used not only to examine the basic behavior of rubbery materials, but also in the routine inspection of rubber items and components.
- Elastomers and Rubber
- Test Facilities, Equipment and Methods