DYNAMIC FRACTURE TOUGHNESS DETERMINATION OF LARGE SE(B) SPECIMENS

摘要

In this paper the experimental determination of dynamic fracture toughness of large SE(B) specimens by instrumented drop weight testing will be described. Two evaluation methods have been used and compared: force based quasi-static evaluation and dynamic key curve method. For the latter one the time-to-fracture measurement is necessary, which was done by applying the magnetic emission measurement technique. The magnetic emission probe was successfully installed onto a drop weight tower first time in the world. The two evaluation methods delivered very similar K_(Id) values in the lower shelf region.