ABSTRACT
The majority of the experimental data for the long-term strength of metals in the multiaxial stress state relates to the tests with constant loading. This chapter deals with the systematic analysis of the long-term fracture of metals at constant stresses using the criterial approach. The high-temperature tests in the conditions of the multiaxial stress state are associated with considerable technical difficulties and, therefore, only a small number of reliable experimental data are available. The chapter provides a review of the investigation of deformation and fracture of materials in the multiaxial stress state, including analysis of the studies of Russian and foreign scientists in the period 1929–1984. The concept of the equivalent stresses is treated as a general approach to investigating the mechanics of deformed solids in the conditions of the multiaxial stress state. The majority of the experimental data for the long-term strength of metals in the multiaxial stress states relates to the tests with constant loading.
