temperature, and load ratio on the endurance of heat-resistant steels IKh2M and KhI8N9," Probl. Prochn., No. 4, 35-40 (1980). 3. V. S. Ivanova and A. A. Shanyavskii, Quantitative Fractography. Fatigue Fracture [in Russian], Metallurgiya, Chelyabinsk (1988). 4. A. A. Kaminskii and G. V. Galatenko, "Study of the growth of fatigue cracks in strainhardening materials," Prikl. Mekh., 20, No. 4, 54-60 (1984). 5. B. I. Koval'chuk, A. A. Lebedev, and S. E. Umanskii, Mechanics of Inelastic Deformation of Structural Materials and Elements [in Russian], Naukova Dumka, Kiev (1987). 6. M. Ya. Leonov, "Elements of a theory of brittle fracture," Zh. Prikl. Mekh. Tekh. Fiz., No. 3, 85-92 (1961). 7. S. B. Nizhnik, "Stress-strain curves of stable and metastable two-phase steel in relation to its structure and the volume contents of the phases," Probl. Prochn., No. 3, 57-61 (Z980). 8. V. N. Bastun, S. B. Nizhnik, V. P. Ostrovskaya, and T. Ya. Mel'nikova, "Effect of structure on the fracture toughness of austenitic steel under cyclic loading," Fiz.-Khim. Mekh. Mater., No. 2, 53-57 (1989). 9. A. A. Ostsemin, S. A. Deniskin, and L. L. Sitnikov, "Determination of the stress intensity factor by the methods of photoelastic modeling," Probl. Prochn., No. i, 33-37 (1990). 10. V. V. Panasyuk, Limit Equilibrium of Brittle Bodies with Cracks [in Russian], Naukova Dumka, Kiev (1968). ii. V. Z. Parton and E. M. Morozov, Mechanics of Elastoplastic Fracture [in Russian], Nauka, Moscow (1985). 12. PD 50.345-82. Procedural Directive. Calculation and Testing of Strength in MachineBuilding. Methods of Mechanical Testing for Metals. Determination of Fracture Toughness (Crack Resistance) Characteristics under Static Loading. Izd-vo Standartov, Moscow (1982). 13. S. B. Nizhnik, B. I. Koval'chuk, E. S. Istomina, and E. A. Dmitrieva, "Structure and mechanical properties of austenitic steel in low-temperature deformation with linear and plane stress states," Probl. Prochn., No. 3, 81-86 (1978).