ASTM E208 Drop Weight Test for Nil-Ductility Temperature of Ferritic Steel
ASTM E208 Drop Weight Test for Nil-Ductility Temperature of Ferritic Steel
The ASTM E208 drop weight test is used to determine the nil-ductility transition (NDT) temperature of ferritic steels 5/8 inch thick (15.9 mm) and over. The NDT temperature is the temperature at which the fracture mode of steel changes from ductile to brittle. At temperatures above the NDT a piece of steel will stretch or deform in a ductile manner before fracturing when loaded to its ultimate tensile strength. At temperatures lower than the NDT that same piece of steel will fail in a brittle manner when loaded to its yield strength (roughly half of its ultimate tensile strength). Once a brittle failure begins the crack will continue to grow until it runs out of material, the pressure is released or it encounters steel that is more ductile.
To find out the steel’s NDT temperature, beam specimens are prepared according to ASTM E208 and subjected to a single impact from a drop weight test system.
The ASTM E208 drop weight test is used to determine the nil-ductility transition (NDT) temperature of ferritic steels 5/8 inch thick (15.9 mm) and over. The NDT temperature is the temperature at which the fracture mode of steel changes from ductile to brittle. At temperatures above the NDT a piece of steel will stretch or deform in a ductile manner before fracturing when loaded to its ultimate tensile strength. At temperatures lower than the NDT that same piece of steel will fail in a brittle manner when loaded to its yield strength (roughly half of its ultimate tensile strength). Once a brittle failure begins the crack will continue to grow until it runs out of material, the pressure is released or it encounters steel that is more ductile.
To find out the steel’s NDT temperature, beam specimens are prepared according to ASTM E208 and subjected to a single impact from a drop weight test system.
Relate Products
