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Variables studied in this evaluation of the Battelle type drop-weight tear test (DWTT) include operator, test machine, specimen thickness, notch type, and strength level of the material tested. Operator and machine variations were found to be small. For a given material, increasing the specimen thickness raises the plateau energy and the transition temperature. Energy at a given percent shear is proportional to thickness. Notches examined include pressed notch, machined notch, fatigue crack, and crack starter weld. Continued use of the pressed notch is recommended. A side grooved DWTT specimen is used to compare the toughness of heat affected zones of welded specimens to that of the base metal. Work in this area is continuing.
drop-weight tests, tear tests, fractures (materials), transition temperature, fracture (materials), toughness, fracture appearance, impact tests, welds, pendulums, test equipment, evaluation, tests
Senior research metallurgistPersonal member, Armco Steel Corp.ASTM, Middletown, Ohio
Manager-Supporting LaboratoriesPersonal member, Armco Steel Corp.ASTM, Middletown, Ohio