Experimental data and mathematical models of the dependence of the yield strength of constructional steels on test temperature have been analyzed. Adequacy of the known models is evaluated, and recommendations are given for determining the yield strength of low-carbon and low-alloy constructional steels under the negative climatic temperature action.
The study of the elastic and elastoplastic stress-strain state of a plate with a semi-elliptical crack when changing its geometry has been carried out. The process of transition of a semi-elliptical crack into a through one was considered. Options of the stress-strain state were determined by means of the FEA method. An approximating dependence of the stress intensity factor on geometry of the plate is suggested. Keywords: strength, semi-elliptical crack, K-calibration, stress intensity factor, elastoplastic deformation, stress state intensity.
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