ISSN:
1662-7482
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The measurement of residual stress using the incremental hole drilling is well established, but themain limitations with the conventional strain gauge approach are the requirements for surfacepreparation, the need for accurate alignment and drilling, the restricted range of hole geometriescommensurate with the specific gauge designs, and the limited range of strain data averaged overthe footprint of the strain gauge grid. Recent attempts to extend the method have seen theapplication of full field optical techniques such as electronic speckle pattern interferometry andholographic interferometry for measuring the strain fields around the hole, but these methods aresensitive to vibration and this limits their practical use to controlled laboratory environments.There are significant potential benefits therefore of using a more robust technique based on DigitalImage Correlation (DIC), and work is presented in this study on the development of the method formeasuring surface displacements and strain fields generated during incremental hole drilling. Someof the practical issues associated with the technique development, including the optimization ofapplied patterns, the development of the optical system and integration with current hole drillingequipment are discussed, and although measurements are only presented for a single load case - theequi-biaxial stress state introduced during shot peening - the novel aspect of this work is theintegration of DIC measurements with incremental drilling and an application of the IntegralMethod analysis to measure the variation of residual stress with depth. Validation data comparingresults from conventional strain gauge data and FE models is also presented
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/38/transtech_doi~10.4028%252Fwww.scientific.net%252FAMM.13-14.65.pdf
Permalink
