Comparisons of K sub I c Measurements by the Short Rod and ASTM E 399Methods.

摘要

A multilaboratory blind comparison testing program was used to evaluate the accuracy of the short rod method of measuring the fracture toughness of metallic materials. Valid comparisons between K(Ic's) measured according to ASTM E 399 and by the short rod method were obtained for several steels, aluminum alloys, and titanium. The short rod K(Ic) values were consistently low, averaging 6 percent below the measurements according to E 399. A 4 percent adjustment in the short rod calibration constant, which had been previously evaluated only to + or - 7 percent, brings the two sets of K(Ic) measurements into very good agreement. The short rod method thus appears to be a viable alternative for measuring the fracture toughness of metallic materials. (Author)