Effect of Photoviscoelasticity and Photoviscoplasticity on Polycarbonate Material.

Polycarbonate material used for photoelastic and photoplastic experiments has obvious viscosity. Naturally, the optical properties of polycarbonate material are affected by factors such as temperature, deformation speed and time. In this paper, tensile experiments were carried out to investigate the effect of photoviscoelastit and photoviscoplastic properties, using a tensile experimental machine which is provided with a small electric stove. As a result, it became clear how the mechanical and optical constants, such as Young's modulus E, photoelastic sensitivity a and photoplastic fringe value fεp, were changed by the different temperatures from 120°C to 155°C with a step of 5°C and the different tensile speeds, i.e., 0.5, 2, 6, 10, 15, and 20 mm/min. Young's modulus E and photoelastic sensitivity a are influenced by both the temperatures and tensile speeds, but the photoplastic fringe value fεp is only affected by the temperatures and is not affected by the tensile speeds.