Abstract
Results of experimental investigations and assessment of theoretical backgrounds of the thermomechanical preloading effect on the static crack resistance characteristics of heat-resistant 15Kh2NMFA steel are presented. The longitudinal shear component is established to decrease a “positive effect” of an increase in crack resistance. A decrease of crack resistance in longitudinal shear as compared to that in normal fracture is also observed above the critical brittleness temperature of the material, which should be considered in equipment service life calculations by crack resistance criteria.
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