INVESTIGATION INTO THE USE OF MINIATURE SPECIMENS FOR THE DETERMINATION OF K_(IC) AND K_(ISCC) VALUES

摘要

This paper reports the method of fatigue precracking, test technique (K_(IC), K_(SICC)) and analysis employed for a circumferentially cracked round specimen (CCR) of 8mm diameter. A comparison with the results obtained from the larger, CT-type specimen is also provided. K_(IC) determination was performed for 2xxx- and 7xxx-series aluminium alloys, and for TA11 (Ti-6A1-4V) titanium alloy, these being widely used in the aerospace industry. K_(ISCC) values were obtained for 2xxx and 7xxx series aluminium alloys in a substitute seawater solution (ASTM D 1141).