FIFTH CANADIAN CONFERENCE ON NONDESTRUCTIVE ... - IAEA

(K/)
-fr— BASELINE; MAGNETISATION DUE TO
FIRST 3A CURRENT PULSE
O — BEFORE SECOND 3A PULSE! ^O*'lNITIAL STRESSING
"^^tf^NEXT 5 STRESS CYCLES
— AFTER SECOND 3A PULSE: *D*'lNITIAL STRESSING
20 40 60 80
MAXIMUM BENDING STRESS (MPa)
Figure 13: Peak to peak radial field changes as a function of maximum bending
stress for a pipe magnetised by a 3A current pulse in a coaxially
wound solenoidal coil then subjected to 5 bending stress cycles
followed by a similar magnetising current pulse and a further
stress cycle.
STRESS CYCLE
TYPICAL
UNCERTAINTY
100 110