Care should be taken to ensure that the load is applied as axially as possible. ![]() As in E 8, the ratio of gauge length to diameter should be 4. According to E 21, specimens should be round whenever the material dimensions allow for this geometry-exceptions are for sheet or strip type materials. Specimen sizes described in ASTM E 8 are usually suitable for testing to E 21. ASTM E 21 covers tension testing methods to determine yield strength, tensile strength, elongation and reduction of area of metals at elevated temperatures.
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