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用侧向线切缝的TPB试样进行J_R阻力曲线试验表明:当S_R=(B-B_n)/B≥0.2(S_R为线切缝深度比,B_n为净截面厚度),唇口完全消除,并使单位厚度的形变功U_n/B_n与S_R =0的U/B相近,从而得到相同的J_R积分阻力值,这个方法可以为薄试样测定材料平面应变阻力曲线及其延性断裂韧度特征值提供方便。
The test of J_R resistance curve of the side-cut TPB shows that the lip is completely eliminated when S_R = (B-B_n) /B≥0.2 (S_R is the ratio of the depth of the line cut, B_n is the net section thickness) And makes the deformation work U_n / B_n per unit thickness similar to U / B with S_R = 0, so as to obtain the same J_R integral resistance value. This method can be used to measure the plane strain resistance curve of material and the characteristic value of ductile fracture toughness to offer comfort.