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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.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
1.1 This test method covers the determination of the modulus of elasticity of thermostat metals at any temperature between −300 and +1000°F (−185 and 540°C) by mounting the specimen as a cantilever beam and measuring the deflection when subjected to a mechanical load.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to become familiar with all hazards including those identified in the appropriate Safety Data Sheet (SDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental practices, and determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
B388 Specification for Thermostat Metal Sheet and Strip
ICS Number Code 77.120.01 (Non-ferrous metals in general)
UNSPSC Code 41112209(Thermostats)
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ASTM B223-08(2018), Standard Test Method for Modulus of Elasticity of Thermostat Metals (Cantilever Beam Method), ASTM International, West Conshohocken, PA, 2018, www.astm.orgBack to Top