photo elastic

photoelasticity

[foh-toh-i-la-stis-i-tee, -ee-la-stis-]
noun Physics.
the phenomenon of double refraction of polarized light by a transparent substance under elastic stress, used to measure strain in elastic, transparent materials.

Origin:
1910–15; photo- + elasticity

photoelastic [foh-toh-i-las-tik] , adjective
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World English Dictionary
photoelasticity (ˌfəʊtəʊɪlæˈstɪsɪtɪ)
 
n
the effects of stress, such as double refraction, on the optical properties of transparent materials

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