Experimental study of the effect of the type of stress state on plastic strain in structural materials at low temperatures

Abstract

The analysis is made of modern methods and equipment for testing materials at cryogenic temperatures. The authors describe an automated complex developed at the Institute for Problems of Strength of the Academy of Sciences of the Ukr. SSR for low-temperature tests of structural materials under conditions of controlled biaxial loading which imitates the operation of cryogenic vessels and pipe-lines. Analyzed are the results of experimental investigations into the laws of elasto-plastic deformation which were carried out on the materials of different grades loaded in accordance with complex programs over a wide temperature range. Main attention is given to new effects which are associated with the influence of cooling on the process of deformation under conditions of stress state variation. Variants are presented of analytical description within the framework of the elasto-plastic deformation theory of the experimentally established laws.