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作者借助扫描电镜,在加载条件下观测了10×10mm预裂纹三点弯曲试样裂纹顶端的钝化和起裂过程。提出了微裂纹扩展阻力曲线概念,给出了宏观起裂状态的确切定义,同时提供了一个测定起裂COD的全新方法。
Using scanning electron microscopy, under the loading conditions, the crack initiation and crack initiation of 10 × 10mm pre-crack three-point bending specimens were observed. The concept of microcrack propagation resistance curve is proposed. The exact definition of macroscopic initiation state is given, and a new method for determination of initiating COD is provided.