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实验力学 1988
Effect of Specimen Size on J_R Resistance Curve of Ductile Materials
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Abstract:
The effect of specimen size on the J_(Ic) and the slope of J_R curve (dJ/da) was studied by using three point bending (TPB)and side-grooved TPB specimens of different sizes. The results showed that J_(Ic) was affected insignificantly by specimen size when it is made according to national standard GB2038-80. On the other hand, dJ/da was affected to certain degree by the specimen size. Therefore, it is necessary to use larger specimens or side-grooved specimens to measure J_R curve when the stability of crack growth is evaluated on the basis of J_R-curve method.
