What is the DWT test?
The drop weight test (DWT) was developed at the Naval Research Laboratory in 1952. The DWT test is also colloquially known as the Pellini test. Like the DWT and CTOD test, it is a test of fracture mechanics. In this test, the NDT temperature is determined as the crack arrest temperature (nil-ductility-transition). This is the temperature at which the material becomes tough enough to stop a stably propagating crack. Below this NDT temperature, the material cannot be used, so the NDT temperature is a design criterion for corresponding components (fracture mechanical strength verification).