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The determination of the critical levels of stresses in the form of the yield point for materials with Quasiparabolic course of the tension curve is based on the conventional determination of remaining strain. The development of remaining strain, determined through observation of an increase in temperature on the surface of a specimen during the growth of stress O" ii ' confirmed by an increase in the values of the factors of acoustic emission, allows the physical determination of the place of occurrence of the yield point. The experiment was made for the spheroidal graphite cast iron, grade Zs 60002.