ASTM E8/E8M – Tensile Testing of Metallic Materials
This test methods cover the tension testing of metallic materials in any form at room temperature, specifically, the methods of determination of yield strength, yield point elongation, tensile strength, elongation, and reduction of area. The gauge lengths for most round specimens are required to be 4D for E8 and 5D for E8M. The gauge length is the most significant difference between E8 and E8M test specimens.
There are three (3) types of loading methods that can be used to perform the tensile test.
Control Method A – Rate of Stressing for Determining Yield Properties
The rate of stress application in the linear elastic region is between 1.15 and 11.5 MPa/second (10,000 and 100,000 psi/minute).
Control Method B – Rate of Straining Control Method for Determining Yield Properties
The rate of straining shall be set and maintained at 0.015 + 0.006 mm/mm/min (in./in./min).
Control Method C – Crosshead Speed Control Method for Determining Yield Properties
The test speed shall be set to a speed equal to 0.015 + 0.003 mm/mm/min (in./in./min) of the length original reduced section (not the gage section).
The customer will provide which loading method to use.
The Yield Strength is calculated at a 0.2% offset. Other offsets may be used at the customer’s request.