Polarised Stress — Engineering Plastic Photoelasticity
101.80 £
An engineering plastic component photographed between crossed polarisers under stress — the internal stress distribution rendered as vivid birefringent colour contours that map the mechanical load paths through the material.
Description
Photoelastic stress analysis is an engineering technique that uses birefringent transparent materials to visualise internal stress distributions — the same stress that is invisible in production components is rendered as vivid colour patterns when a stressed transparent model is viewed between crossed polarisers. This image was made using a polycarbonate disc loaded in compression between two flat platen surfaces, the applied load producing a stress distribution that is theoretically predicted by Hertzian contact stress mechanics. Between crossed polarisers, the stress distribution appears as a series of concentric isochromatic fringes in the complementary colour sequence, each fringe representing a constant value of principal stress difference. The fringe pattern serves simultaneously as an engineering measurement tool and as a vivid abstract colour image — the colour map of a mechanical force field rendered as art.
