Abstract
1. In the −196 to −50 °C and −50 to 20 °C ranges the crack resistance of 15Kh2NMFA steel approximately doubles while in the 200–500 °C range it is a maximum and depends very little upon temperature. 2. The influence of casing material inhomogeneity on crack resistance is especially substantial in the −50 to 20 °C range while with T 200 °C it is significantly less. 3. For the two investigated orientations of cutting the samples the influence of anisotropy in the −196 to 20 °C range is less significant than the influence of material inhomogeneity. 4. For a compact sample withZ/W ≈ 0.6 the opening of the edges of a notch over the length of action of a load is practically equal to the displacement of the point of application of the load, which has justified the use of standard beam sensors for determining the values of the J-integral. 5. The maximum shear drag of a material at the crack tip in the direction of sample thickness of samples at the moment corresponding to the advance of a crack may be substantially less than in full failure of a sample.
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