Control of Mechanical Stresses of High Pressure Container Walls by Magnetoelastic Method

[摘要] Deformations of the walls of pressure vessels arising in the process of testing and operation, as well as reduce their thickness due to corrosion, to create the prerequisites for the growth of mechanical stresses which accelerating the processes of strain aging, embrittlement of the material and reducing its fatigue properties. This article is devoted to researches of the magnetoelastic demagnetization in the wall of steel vessel of loading by internal pressure. It is established that the increasing pressure on the vessel wall is accompanied by a monotonic decrease in the intensity of the magnetic stray field of local magnetization of steel. It is shown that a magnetic stray field of local magnetization of the wall of steel vessel is non-uniform due to differences in structure and stresses. It is proposed to use the obtained results to control the stress state of vessels, experiencing multi-axial loads generated by internal pressure (pipelines, oil tanks, etc.) The method of magnetoelastic of the demagnetization of the steel has a high sensitivity to mechanical stress, the simplicity of implementation and expressiveness compared to the strain gauge and method of coercive force.

[发布机构] Industrial University of Tyumen, 38 Volodarskogost., Tyumen; 625000, Russia^1

[效力级别] 运输工程

[关键词] Fatigue properties;High pressure container;Local magnetization;Magnetic stray fields;Magnetoelastic demagnetization;Magnetoelastic method;Mechanical stress;Monotonic decrease