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UBC Theses and Dissertations

Residual stress measurement of plates using shearography Walsh, Allan Frederick


Wood mills have used bandsaw blades for the primary breakdown of timber into lumber for centuries. By reducing the width of the saw cutting edge, material waste can be reduced. Thin-kerf saw blades are susceptible to lateral forces during cutting. To combat this behavior, saw lers introduce residual stresses into the blades. Classical methods for monitoring saw blade tension, such as the light-gap method, are subjective and analog. There exists a necessity to monitor the amount of residual stress induced into the blades reliably, using a nondestructive test. A newly proposed method for stress evaluation, incremental shearography, o ers the advantage of measuring transverse plate bending behavior at micron resolution. Shearography, a direct measure of surface slope, promises a robust, full- eld measurement using low-cost components. By comparing measured slopes to those analytically found, a stress resultant of the tensioning process can be inferred.

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