ASTM B557-02a pdf free

04-15-2021 comment

ASTM B557-02a pdf free.Standard Test Methods of Tension Testing Wrought and Cast Aluminum- and Magnesium-Alloy Products.
7.8.1 To determine elongation after fracture,carefully fitends of the fractured specimen together and measure thedistance between the gage marks to the nearest 0.01 in. Apercentage scale reading to 0.5 % of the gage length may beused. The elongation after fracture is the increase in length ofthe gage length, expressed as a percentage of the original gagelength. Report the elongation after fracture using both thepercentage increase and the original gage length.
If any part of the fracture takes place outside of themiddle half of the gage length or in a punched or scribed markwithin the reduced section, the elongation value obtained maynot be representative of the material. If the elongation someasured meets the minimum requirements specified,nofurther testing is required, but the location of fracture shall benoted. If the elongation is less than the minimum requirements,discard the test and test a replacement specimen as allowed in8.1. Elongation at fracture is defined as the elongationmeasured just prior to the sudden decrease in force associatedwith fracture. For many ductile materials not exhibiting asudden decrease in force,the elongation at fracture can betaken as the strain measured just prior to when the force fallsbelow 10 % of the maximum force encountered during the test. Elongation at fracture shall include elastic andplastic elongation and may be determined with autographic orautomated methods using extensometers verified over thestrain range of interest (see 5.4). Use a Class B2 or betterextensometer for materials having less than 5 % elongation,aClass C or better extensometer for materials having elongationgreater than or equal to 5 % but less than 50 %, and a Class Dor better extensometer for materials having 50 % or greaterelongation. In all cases, the extensometer gage length shall bethe nominal gage length required for the specimen being tested.Due to the lack of precision in fitting fractured ends together,the elongation after fracture using the manual methods of thepreceding paragraphs may differ from the elongation at fracturedetermined with extensometers. Percent elongation at fracture may be calculateddirectly from elongation at fracture data and reported instead ofpercent elongation after fracture as calculated in 7.8.1 and7.8.2.However, the two parameters are not interchangeable.ASTM B557 pdf download.

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