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Study of Photoplastic Behaviour of Polycarbonate using Digital Image Correlation

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Abstract

Earlier studies on photoplastic behaviour of polycarbonate are limited to the strain at which the localized yielding (necking) initiates (about 6% strain). In this study, the photoplastic behaviour of polycarbonate is studied using digital image correlation (DIC). Two cases are considered: one in which no localized yielding is observed and the other in which initiation and propagation of the localized yielding is observed. For the first case, a modified dog bone specimen is proposed to evaluate the photoplastic constant. In the second case, a conventional tensile test specimen is used. Both photoplasticity (transmission and reflection) and DIC experiments are performed on the specimens to determine the relation between fringe order and principal strain difference for strains of up to 60%. It is observed that the photoplastic constant is a function of strain. Finally, the behaviour of the tensile test specimen is numerically simulated. The true stress-strain curve of polycarbonate needed for FE simulation is determined using DIC experiments on the standard tensile test specimen. By post-processing the FE results, isochromatic fringes are plotted and compared with experimental results.

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Notes

  1. In reflection photoelasticity, as both the incident and the reflected light contribute to the photoplastic effect; a factor of 2 comes in the denominator of the right hand side of the equation (equation (1)). For transmission photoelasticity, the strain-optic law is same as equation (1) except for the factor of 2.

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Acknowledgements

The authors would like to acknowledge Sidharth Menon, Department of Mechanical Engineering, Amrita School of Engineering, Amritapuri, for his initial contribution on FE simulations.

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Authors and Affiliations

  1. Department of Applied Mechanics, IIT Madras, Chennai, 600036, India

    M. Subramanyam Reddy & K. Ramesh

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  1. M. Subramanyam Reddy
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  2. K. Ramesh
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Correspondence to M. Subramanyam Reddy.

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Subramanyam Reddy, M., Ramesh, K. Study of Photoplastic Behaviour of Polycarbonate using Digital Image Correlation. Exp Mech 58, 983–995 (2018). https://doi.org/10.1007/s11340-018-0399-y

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  • DOI: https://doi.org/10.1007/s11340-018-0399-y

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