The assessment of damage and resource of vessel and apparatus elements, taking into account the adaptation of the material to long-term quasistatic loading

Abstract

The research of influence of long quasistatic loading on characteristics of resistance to deformations and destruction of elements of vessels and devices, is of great interest to the solution of problems of control and forecasting of their technical condition. In order to detect changes in the mechanical characteristics of 09G2S steel and changes in the structure of the material under the influence of quasistatic loading, destructive tests of the studied samples in an initial state and after establishment of extrema of tension of constant magnetic field have been carried out. It is established that long influence of quasistatic loading in the considered conditions leads to change of a condition of steel 09G2S which causes reduction of characteristics of plasticity (S) and energy of destruction and increase in resistance to plastic deformations (ay , ctts) what, in turn, can lead to a reduction temporary resource. The received results have allowed to develop the equation of assessment of a resource of the shell designs operated in the conditions of quasistatic loading, based on settlement and experimental dependence of a ratio of mechanical characteristics (cry/eTS) of steel 09G2S from duration of quasistatic loading.