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Photoelastic stress analysis of gradually- and steeply graded QHM polymers. a) Experimental setup of photoelastic stress analysis. b) The effect of different stiffness gradients on stress concentrations in QHM polymers. Representative images of photoelastic tensile analysis for mechanically graded specimens with gradually- and steeply graded interfaces from 3 independent experiments. Dashed boxes indicate photoelastic specimens.
