Test Study of Fracture Toughness on Super-high Strength Structural Steel AF1410

Plane-strain fracture toughness is an important mechanical performance index for damage limitation design, so how to obtain this value through test deserves consideration.In this paper, plane-stain fracture toughness test and ductile fracture toughness test were performed for super-highstrength structural steel AF1410.The results manifested that it was difficult for the specimen with big dimensions in the case of plane-strain to be carried out through ordinary testing machine with lower capacity because of the higher fracture toughness value of the material, that it was attained indirectly for plane-strain fracture toughness value of super-high strength steel by the way of ductile fracture toughness test and pertinent formula calculation if proper specimen selected.