%0 book part,GKSS report %@ %A Heerens, J.,Schwalbe, K.-H.,Cornec, A. %D 1988 %J Fracture Mechanics: Eighteenth Symposium - ASTM STP %N %P 374-389 %T Modifications of ASTM E 813-81 standard test method for an improved definition of Jic using new blunting-line equation %U %X