Static and dynamic low-temperature crack resistance of the steels and weld joints of the metal structures of load lifting machines

The results are given of experimental investigations of the static and dynamic low-temperature crack resistance of 1OKhND, St-38-b2, 09G2S, St20, and VSt3sp steels and weld joints of the metal structures of load lifting machines in the 203–293 K range of outdoor temperatures. The ductile-to-brittle transition temperatures are given. The temperature relationships of mechanical properties and stress intensity factors in static K_c, dynamic K_c^d, and cyclic loading K_fc are established. The results may be used in calculations of residual strength and residual life of metal structures with cracks.Translated from Problemy Prochnosti, No. 5, pp. 29–34, May, 1991.