Systematization of constructional materials based on the level of strain hardening and development of an energy method of determination of the allowable stresses and safety factors. Part 2. Determination of allowable stresses taking into consideration the reserves of strain hardening materials

Abstract

An energy method of determination of allowable stresses and undetermined strength safety factors and analytically based obtaining of higher values of allowable stresses as the result of taking into consideration reserves of strain hardenability, plasticity, and toughness (crack resistance) materials in addition to their strength properties has been developed. As the result of the proposed method determination of allowable stresses (safety factors), until now based primarily on accumulated engineering experience and traditions, is acquiring a scientific basis and the metallurgical industry, the machine building branches of industry, and construction the capability of using reserves of strength of strain hardening materials and as the result of reducing the metal consumption for production of them, including semifinished products, parts, and structures, without reducing the level of their reliability. The reliability of the method has been confirmed by the results of tests at normal and cryogenic temperatures of large models and full-size welded pressure vessels produced from materials of various types.