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在J_R阻力曲线试验方法中,为了获得一条理想的J_R线,试验时使一组试样的测量裂纹扩展量⊿_a在0.50毫米内较均匀分布,但必须有大于0.03毫米,小于0.15毫米的值和大于0.40毫米的值是试验成败的关键。在P-⊿曲线下,如图1。OP_eP_sD是形变功中的塑性部分。裂纹扩展量⊿_a是裂纹在外力作用下发生钝化直至开裂、扩展的结果。所以,对大多数材质较均匀的中强钢来说,其塑性施力点位移⊿_p=OD是与测量裂
J_R resistance curve test method, in order to obtain an ideal J_R line, the test group of a set of samples to measure the amount of crack expansion ⊿_a within 0.50 mm more evenly distributed, but must have more than 0.03 mm, less than 0.15 mm value And greater than 0.40 mm value is the key to test success. In the P-⊿ curve, shown in Figure 1. OP_eP_sD is the plastic part of the deforming work. The amount of crack propagation ⊿_a is the result of passivation of the crack under the action of external force until it cracks and expands. Therefore, for most of the more uniform medium strength steel, the plastic force point displacement ⊿_p = OD is measured with the crack