Nominal Strain at Break (Grip Separation).End the test after sample break (rupture).The target time from start of test to break should be from 30 seconds to 5 minutes. Speed depends on specimen shape and can range from 0.05 – 20 inches per minute. Begin the test by separating the tensile grips at a constant rate of speed.The exact shape you use is dependent upon your material’s rigidity and thickness. Cut or injection mold your material into one of the five “dumbbell” shapes.If you have film under 1mm in thickness use ASTM D882. This is a quick summary to decide if this test is right for you, and to point out what equipment you need to perform the test.įirst off, do not perform this test if you have films or elastomers. If you are going to perform this test, you should read the entire specification from ASTM. A universal testing machine (tensile testing machine) is needed to perform this test. This test method uses standard “dumbell” or “dogbone” shaped specimens under 14mm of thickness. ![]() ASTM D638 is one of the most common plastic strength specifications and covers the tensile properties of unreinforced and reinforced plastics.
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