EFFECT OF LOADING RATE ON UPPER SHELF CRACK RESISTANCE OF STRUCTURAL STEELS WITH DIFFERENT YIELD STRENGTH AND MICROSTRUCTURE K. BRÜNINGHAUS, M. TWICKLER, R. TWICKLER et W. DAHLJ. Phys. Colloques, 49 C3 (1988) C3-301-C3-306DOI: https://doi.org/10.1051/jphyscol:1988343