Residual stress measurement of PMMA by combining drilling-hole with digital speckle correlation method

X. F. Yao; T. C. Xiong; H. M. Xu; J. P. Wan; G. R. Long

doi:10.1117/12.839305

25 August 2009 Residual stress measurement of PMMA by combining drilling-hole with digital speckle correlation method

X. F. Yao, T. C. Xiong, H. M. Xu, J. P. Wan, G. R. Long

Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 73754F (2009) https://doi.org/10.1117/12.839305
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China

Abstract

The residual stresses of the PMMA (polymethyl methacrylate) specimens after being drilled, reamed and polished respectively are investigated using the digital speckle correlation experimental method,. According to the displacement fields around the correlated calculated region, the polynomial curve fitting method is used to obtain the continuous displacement fields, and the strain fields can be obtained from the derivative of the displacement fields. Considering the constitutive equation of the material, the expression of the residual stress can be presented. During the data processing, according to the fitting effect of the data, the calculation region of the correlated speckles and the degree of the polynomial fitting curve is decided. These results show that the maximum stress is at the hole-wall of the drilling hole specimen and with the increasing of the diameter of the drilled hole, the residual stress resulting from the hole drilling increases, whereas the process of reaming and polishing hole can reduce the residual stress. The relative large discrete degree of the residual stress is due to the chip removal ability of the drill bit, the cutting feed of the drill and other various reasons.

Citation Download Citation

X. F. Yao, T. C. Xiong, H. M. Xu, J. P. Wan, and G. R. Long "Residual stress measurement of PMMA by combining drilling-hole with digital speckle correlation method", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73754F (25 August 2009); https://doi.org/10.1117/12.839305

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