Abstract
The results of experimental issues on plane stress-strain state of steel pipes specimens by residual magnetic field strength and coercive force of metal are given. The results of these experiments comply with the fundamental symbolic expressions for magnetic diagnostic parameters depended on equivalent mechanical strain of metal in plane stress-strain state. The experimental results show the validity of the analytic expressions determining the dependence of field gradient of residual magnetization of metal in deformed and being deformed wrought steel products and the coercive force of deformed steel products on effective mechanical stress. Experiments revealed stability of magneto-elastic sensitivity of remanent magnetization derived from formulae for single-axis and plane stress-strain state. It is shown that evaluation of effective values of residual and total mechanical strains of steel part in conditions of plane stress-strain state can be correctly carried out on experimental dependence of residual magnetic field strength on mechanical strain of metal obtained in one-axial stress-strain state conditions. On the basis of experimental data and expressions for residual magnetic field strength and coercive force in plane stress-strain state conditions the effective values of residual and total mechanical strains of steel pipes specimens are determined. It is shown that actual values and signs of circular and axial residual mechanical strains of steel pipe metal essentially determines the behavior of coercive force in plane stress-strain state conditions, which may differ significantly from the case in linear loading conditions. Comparison of steel pipes plane stress-strain state investigation results obtained on specimens made from different structural steels by evaluation on residual magnetic field strength and coercive force of metal are in good agreement one with another.
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