Which risk increases when analyzing stress distributions in polymer materials using photoelasticity when the light source emits unpolarized light?

💡 Explanation

In photoelasticity, stress distribution visualization relies on birefringence, which changes the polarization of light as it passes through the stressed material; therefore, if the incident light is unpolarized, the observed fringe patterns become ambiguous because the mechanism of preferential transmission will be lost, rather than increased thermal degradation.

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