Standard Test Method for Modulus of Elasticity of Thermostat Metals (Cantilever Beam Method)

Abstract

This test method covers the determination of the modulus of elasticity of thermostat metals within a particular temperature range. The test is done by mounting the specimen as a cantilever and measuring its deflection when subjected to a mechanical load. Each test specimen should be finished to size by careful machining or filing after being roughly cut, slit, or sheared from the samples. Then the specimen is preformed into a shape approximating the segment of a circle and subsequently heat treated to relieve all internal stresses. To permit maximum sensitivity, any oxide and other foreign substances must be carefully removed from all surfaces of the test specimen which directly affect the electrical resistance of the electronic indicator circuit through the testing apparatus. Extra care should be taken so that the load does not overstress the specimen beyond its elastic limit, if this happens, a new specimen shall be substituted and a lighter load should be used. The modulus of elasticity of each test material is computed using the specimen size and the average deflection for a known load.