Magnetic Perturbation Inspection of Inner Bearing Races |
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adjacent scan tracks Amp mV angle apparent approximately arrow Axial Lina boundary layer centerline Circ CORRESPONDING DEFECT defect location DEFECT SIGNAL depth Endurance Testing etching expanded record expanded sweep fatigue tested FERROMAGNETIC Figure 14 Figure 23 flux perturbation Hertz in/cm inch inclusions located initial inner bearing races inner races inspection records Lewis Research Center Linagraph magnetic flux magnetic inspection magnetic perturbation inspection MAGNETIC PERTURBATION SIGNAL Magnetic Record metallurgical microcracking mv/cm N/m² observed opposite polarity signals oscilloscope Outer race particles Photo Hours photomicrograph Plastic Zone Shift plastically deformed prior to endurance PROBE TYPES raceway surface RECORDS WITH TYPICAL rolling track run-in cycles SCRIBE LINES SEQUENT TO ENDURANCE shear stresses shown in Figure signal amplitude Signal Characteristics signal locations signal source SILICATE OR ALUMINATE Southwest Research Institute Subsurface Inclusion SUBSURFACE PLASTIC ZONE surface flaw SURFACE INDENTS TYPICAL SIGNALS PRIOR TYPICAL SIGNALS SUB unetched void polarity signals wwww