Abstract
Fracture toughness K JIc values, determined on standard compact specimens by the use of modified equations of Rice, Paris and Merkle, and Merkle and Corten, are presented. The equations permit elimination of errors caused by inaccuracies in the loadline displacement measurements, and they can be applied not only for deeply cracked specimens but also for a wider range of ratios a W . Experimental results, obtained on two low strength steels using 75 and 40mm thick specimens, showed a very good agreement between the K JIc values calculated by both equations. These values do not differ by more than 2%.
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