%0 GKSS report %@ %A Heerens, J., Schwalbe, K.-H., Cornec, A. %D 1988 %J Fracture Mechanics: Eighteenth Symposium - ASTM STP %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