Photoplastic investigation on sheet deformation in viscous pressure bulging

Yan Liu; Zhongjin Wang

doi:10.1117/12.839019

24 August 2009 Photoplastic investigation on sheet deformation in viscous pressure bulging

Yan Liu, Zhongjin Wang

Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 73750G (2009) https://doi.org/10.1117/12.839019
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China

Abstract

Deformation characteristics of polycarbonate sheet in viscous pressuring bulging are investigated by photoplastic method in this paper. Strain distribution of specimens with different heights was obtained through isochromatic fringe patterns. The shape of the specimen was axisymmetric hemisphere and the directions of the three principal strains were approximately along the longitudinal, latitudinal and thickness directions, respectively. As the tangent plane can be regarded as the principal plane, an approach was represented to calculate the principal strains of the specimen with no need to cutting slices. The specimen was rotated in the polarized light field to obtain isochromatic fringe patterns with different incident angles. Strain values were calculated using oblique incidence method and the results were in good agreement with that measured by the grid method. Photoplasticity is a feasible nondestructive full field analysis method for qualitative and quantitative investigation of sheet deformation.

Citation Download Citation

Yan Liu and Zhongjin Wang "Photoplastic investigation on sheet deformation in viscous pressure bulging", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73750G (24 August 2009); https://doi.org/10.1117/12.839019

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