Photoelastic studies for composite dynamics

摘要

A stress-optic law for dynamic photoelastic analysisof orthotropic birefringent composites is postulated based on thestatic stress-optic law of Hyer and Liu. Subsequently, practicalmethods of calibrating dynamic mechanical constants and dynamicstress-fringe values are proposed. With dynamic strainmeasurements and time domain BEM for anisotropic media, threecalibration specimens (0°,90°and 45°)are used to verify theproposed stress-optic law in uniaxial-stress fields and a plate ofunidirectional fiber-reinforced birefringent compostite underimpact loading, with the loading direction parallel, perpendicularand at 45°to the fiber direction, is analyzed to verify the proposedstress-optic law in biaxial-stress fields. Results show that thedynamic stress-optic law for orthotropic birefringent composites isvalid in the two cases.