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Strain sensitivity enhancement for the hole-drilling residual stresses measurement method

University of British Columbia

Two methods for enhancing the strain sensitivity of the hole-drilling method for measuring residual stress fields were examined in this thesis. Such enhanced strain sensitivity is important because it improves the accuracy of the residual stress evaluation. The first method involves enlarging the effective hole size by drilling a reverse taper hole. A simple practical technique for drilling reverse taper holes is described. The strain sensitivity for this new method is compared with that of the conventional hole-drilling method. Experimental results show excellent correspondence with theoretical results. The reasons for the sensitivity improvement are explained. The second method involves designing a 6-element strain gauge rosette. It is shown that the new 6-element rosette significantly enhances the strain sensitivity of the hole-drilling method. Experimental results show excellent agreement with predicted results. Moreover, it is shown that this new rosette improves the accuracy of the method concerning the measurement of the variation of residual stresses with depth.

Thesis/Dissertation

application/pdf

2009-02-21

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http://hdl.handle.net/2429/4907

Mechanical Engineering

University of British Columbia

UBCV

DSpace