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1.1 ,This test method covers the determination of Young's modulus, tangent modulus, and chord modulus of structural materials, see Fig. 1. This test method is limited to materials in which and to temperatures and stresses at which creep is negligible compared to the strain produced immediately upon loading and to elastic behavior.
FIG. 1 ,Stress-Strain Diagrams Showing Straight Lines Corresponding to (a) Young’,s Modulus, (b) Tangent Modulus, and (c) Chord Modulus