%0 conference lecture %@ %A Heerens, J., Read, D. T., Cornec, A., Schwalbe, K.-H. %D 1991 %J Defect Assessment in Components: Fundamentals and Applications; Proceedings of the European Symposium on Elastic-Plastic Fracture Mechanics %P 659-678 %T Interpretation of fracture toughness in the ductile to brittle transition region by fractographical observations %U %X