Abstract��When testing[KIC]for the ductile material�� large specimens and large measuring range machines are needed�� which is a great challenge for the experiment. And it is proposed that[KIC]can be obtained from[J]integral of small specimens by ASTM E1820. The relationship between[J]integral and [KIC]was researched�� the characteristic of the sample fracture was taken into consideration. The study shows that only when the sample loads slowly and satisfies the plane strain condition and the linear elastic is main at the beginning of the crack extension�� it is feasible to change[J]integral of small specimen into large specimen[KIC.]
2017, Vol. 35 
