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As a running log of a test the Stress-strain diagram inherently supplies both a quantitative and a qualitative record of the mean response of a specimen to load. Stress-strain diagrams have been used almost exclusively, however, fro evaluating the constants)for classic strength, stiffness, etc.) ordinarily used in design, but they rarely have been used for their qualitative indications as evidenced by their shape, or as a basis for possible study of the phenomena of failure. This bulletin presents a percentage technique which offers a simple means for study and comparison of shapes of stress-strain diagrams regardless of quantitative differences. The bulletin supplies illustrative comparison...
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