| Abstract: | The formulation and solution technique for the problem of construction of evolutionary equations of creep embrittlement of metal materials are considered. Embrittlement is regarded as loss of plasticity depending on the time to fracture. Experimental data for high-temperature steels and alloys are systematized and analyzed, and, on this basis, two main classes of materials, those that are subjected to ductile fracture and those that undergo embrittlement, are singled out. The kinetics of embrittlement is considered as regards the strain of instantaneous fracture and obeys the power law. The conditions of change in the nature of fracture are formulated, which allows one to calculate the coordinates of the inflection points on delayed-fracture curves. S. P. Timoshenko Institute of Mechanics, National Academy of Sciences of Ukraine, Kiev. Translated from Prikladnaya Mekhanika, Vol. 36, No. 6, pp. 104–113, June, 2000. |
