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FIFTH CANADIAN CONFERENCE ON NONDESTRUCTIVE ... - IAEA

FIFTH CANADIAN CONFERENCE ON NONDESTRUCTIVE ... - IAEA

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Figure 11: Laboratory scale monitoring of stress near pipes stressed by bending<br />

or by internal pressure. The pipes are supported by a central<br />

saddle and tied together at one end. They are bent by jacking<br />

the other ends together. Bending stresses are determined by strain<br />

gauges bonded to the peak stress point of the pipe and are verified<br />

by stress calculations from both the measured deflection and the<br />

required force. Internal pressure is provided hydraulically. A<br />

fluxgate magnetometer is being used to monitor the stress induced<br />

changes in the external field. This is a sensitive device used<br />

for geomagnetic prospecting, mine detection, etc. The pipes can<br />

be arranged at any horizontal and vertical angle to the earth's<br />

magnetic field in order to investigate its effect.

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