Stress patterns in plastic dish

Stress patterns in plastic dish

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Credit: TONY CRADDOCK/SCIENCE PHOTO LIBRARY

Caption: Residual stress patterns in the walled sections of a plastic dish are visible when photographed through polarised light. Photoelastic studies on plastic models are used in the stress analysis of real components and structures. When viewed through polarised light certain plastics display interference fringe patterns from which the direction and magnitude of stresses may be calculated. These calculations may then be related to stresses in real components, whether they be manufactured in steel, aluminium, cast iron or many other materials.

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Keywords: engineering, non-destructive testing, pattern, photoelasticity, plastic, strength, stress analysis, technology, test

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