Abstract
Abstract Impact testing as normally performed with notch bars is objectionable because of large errors inherent in the method of test, and especially those due to errors in machining the notch. Notch tensile specimens are more satisfactory being less sensitive to errors of machining or to accidental variations in structure of the material. In studying tension-impact specimens it was found that materials required a constant energy to rupture independent of the velocity of loading provided certain critical velocities were not exceeded. This critical or “transition” velocity appears to be a fundamental property of a material. Its value varies with chemical compositions and with both preliminary and final heat-treatment, and it also varies with the temperature of test. The study of “transition” velocity is a sensitive tool in research work, both in the development of processing methods and in physical metallurgy. The tension-impact test is a simple test to determine completeness of processing, and affords the design engineer information both as to the safety of the material and its ability to withstand impact loading.
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