2 research outputs found
Peculiarities of the static and dynamic failure mechanism of long-term exploited gas pipeline steel
Mechanical properties are substantiated, that are the most vulnerable to maintenance material deterioration of under prolonged operating time, accompanied by intense damage. The opposite behavior of relative elongation and contraction indicates the intensity of scattered damage of the operated metal. Reducing the percentage reduction indicates operational metal embrittlement, as a result of strain hardening, which can serve as confirmation of the increase in hardness and microhardness. Fractographic analysis of failure mechanisms of steel 17G1S cut in the length and breadth of the pipe is implemented
Structural and mechanical defects of materials of offshore and onshore main gas pipelines after long-term operation
The study has established the main regularities
of a fatigue failure of offshore gas steel pipes installed using
S-lay and J-lay methods.We have numerically analyzed
the influence of preliminary deformation on the fatigue life
of 09Mn2Si steel at different amplitudes of cyclic loading.
The results have revealed the regularities of formation and
development of a fatigue crack in 17Mn1Si steel after 40
years of underground operation. The quantitative analysis
describes the regularities of occurrence and growth of fatigue
cracks in the presence of a stress concentration