Volume 9, Issue 2 (March 1981)
Task Group Report: Results of Interlaboratory Test Programs to Evaluate the Dynamic Tear Test Method
An ASTM Task Group evaluated the revised Standard Test Method for Dynamic Tear Energy of Metallic Materials (E 604). The revised method expanded the range of specimen thickness from the 16 mm (⅝ in.) specified in E 604-77 to include specimens ranging from 4.8 to 16 mm (3/16 to ⅝ in.) in thickness. The minimum impact velocity was also changed from 4.9 to 4 m/s (16 to 13 ft/s). Three series of tests were conducted by 16 laboratories on steels of low, intermediate, and high yield strength. A total of 1300 specimens were involved over a two-year period, and the results were analyzed statistically to support the modifications in the dynamic tear test method. No variations of engineering significance in dynamic tear energy were found with respect to between-laboratory variation in procedures, testing machine type, impact velocity, and specimen preparation within the tolerances set for the dimensions of the test specimens and the critical parameters of the testing procedure.