Evaluation of metallic structures' welded joints durability at the objects of oil and gas producing complex based on accelerated testing
The article proposes a method of evaluation of metal structures' welded joints durability at the objects of oil and gas producing complex based on accelerated testing. This approach is based on a large amount of experimental data processing, given in the scientific works of domestic and foreign researchers, which resulted in established a connection that provides determination of effective coefficient value of welded joints concentration with account of their main construction-geometric parameters. The values of stress concentration coefficients Kσ in the samples used during accelerated tests by means of their recalculation when determining the value of the efficient coefficient of stresses concentration, can be calculated by applying the well-known methods for various types of concentrators, that have complicated geometrical shapes, and load schemes. The developed approach allows to essentially reduce the time of testing the welded joints endurance as compared with the standard testing. The method provides accounting of the constructive-technological parameters of metal structures welded joints at the objects of an oil and gas producing complex when evaluating their durability.