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.

• 本文应用不同尺寸的三点弯曲试样和带边侧槽试样,用实验方法研究了启裂J积分(J_(1C))和J_R阻力曲线的斜率(dJ/da)受试样尺寸的影响。