AASHTO T 314:12(2016) Standard Method of Test for Determining the Fracture Properties of Asphalt Binder in Direct Tension (DT).
3.1.1. asphalt hinder—an asphalt-based cement that is produced from petroleum residue either with or without the addition of particulate organic modifiers of size less than 250 pm.
3.2. Description of Terms Specific to TIi is Standard:
3.2.1. brittle—type of failure in a direct tension test where the stress—strain curve is essentially linear up to the point of failure and the failure is by sudden rupture of the test specimen without appreciable reduction in cross section of the specimen.
3.2.2. brittle-ductile—type of failure in a direct tension test where the stress—strain curve is curvilinear and the failure is by sudden rupture of the test specimen. Limited reduction in cross-section of the spec i men occurs before rupture.
3.2.3. ductile—type of failure in a direct tension test where the specimen does not rupture but fails by t1ow at large strains.
3.2.4. tensile strain—axial strain resulting from the application of a tensile load and calculated as the change in length of the efkctive gauge length caused by the application of the tensile load divided by the original unloaded effective gauge length.
3.2.5. tensile stress—axial stress resulting from the application of a tensile load and calculated as the tensile load divided by the original area of cross-section of the specimen.
3.2.6. failure—point at which the tensile load reaches a maximum value as the test specimen is pulled at a constant rate of elongation.
3.2.7. failure stress—the tensile stress on the test specimen when the load reaches a maximum value during the test method specified in this standard.
3.2.8. failure strain—the tensile strain corresponding to the failure stress.
3.2.9. gauge section—the central portion of the specimen where the cross-section does not change with length. For this geometry. the gauge section is 18 mm in length (see Figure 1).AASHTO T 314 pdf download.