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本文用修正J积分和带侧槽三点弯曲试样测定了几种国产中低强钢的J_R曲线;研究了J_R曲线受试样厚度的影响。还介绍了弹塑性裂纹扩展推力曲线及其确定方法。最后由J_R曲线的概念确定了材料抗裂纹扩展的最大阻力。
In this paper, the J_R curve of several domestic medium and low strength steels was measured by modified J-integral and three-point bending test with side grooves. The effect of the J_R curve on the thickness of the sample was studied. Also introduced the elastic-plastic crack growth thrust curve and its determination method. Finally, the concept of J_R curve determines the maximum resistance of the material to crack propagation.