Abstract
This work illustrates the experimental technique known as photoelasticity and is demonstrated with a photograph taken in the classroom with secondary students. By means of a computer screen, a plastic material and a polarizer, we can build a simple system for stress analysis. The fringe pattern obtained with this basic polariscope is due to the fact that plastic media is subjected to stress or strain because of the fabrication process. Stress and strain in a plastic object also appear under the application of external forces. This fact allows for an accurate determination of stress states at specific weak points and in localized areas of a component.
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