Abstract
The only definitive method for controlling turbine bolt axial force is the measurement of the elastic elogation of bolts with gauges after fastening. This tends to result in an imbalanced bolt fastening force and might affect the remnant life of the bolts. For this reason, acoustoelastic theory was applied to the measurement of bolt axial force and an ultrasonic inspection system was developed. This takes advantage of ultrasonic time-of-flight through the bolt and depends on the changes of the velocity of wave and theoretical elastic elongation under stress. This system can be applied to the axial bolting force control for turbine bolts in a plant, when considering theoretical temperature dependence of time-of-flight through the bolt. The result is in good agreement with measurement on the elastic elongation with a gauge.
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