photoelastic /foh'toh i las"tik/, adj.
/foh'toh i la stis"i tee, -ee'la stis"-/, n. Physics.
the phenomenon of double refraction of polarized light by a transparent substance under elastic stress, used to measure strain in elastic, transparent materials.
[1910-15; PHOTO- + ELASTICITY]

* * *

      the property of some transparent materials, such as glass or plastic, while under stress, to become doubly refracting (i.e., a ray of light will split into two rays at entry). When photoelastic materials are subjected to pressure, internal strains develop that can be observed in polarized light; i.e., light vibrating normally in two planes, which has had one plane of vibration removed by passing through a substance called a polarizer. Two polarizers that are crossed ordinarily do not transmit light, but if a stressed material is placed between them and if the principal axis of the stress is not parallel to this plane of polarization, some light will be transmitted in the form of coloured fringes. Stresses in opaque mechanical structures can be analyzed by making models in plastic and studying the fringe pattern under polarized light, which may be either white (a mixture of all wavelengths) or a single wavelength. A photoelastic model under stress is shown in the photograph. See double refraction.

* * *

Universalium. 2010.

Игры ⚽ Поможем написать реферат

Look at other dictionaries:

  • Photoelasticity — is an experimental method to determine stress distribution in a material. The method is mostly used in cases where mathematical methods become quite cumbersome. Unlike the analytical methods of stress determination, photoelasticity gives a fairly …   Wikipedia

  • Photoelasticity — Photoelasticity. См. Фотоупругость. (Источник: «Металлы и сплавы. Справочник.» Под редакцией Ю.П. Солнцева; НПО Профессионал , НПО Мир и семья ; Санкт Петербург, 2003 г.) …   Словарь металлургических терминов

  • photoelasticity — [fōt΄ō ē΄las tis′ə tē] n. [ PHOTO + ELASTICITY] the property shown by certain transparent solids, esp. glass and plastics, of producing double refraction when put under tension or compression, thus permitting stress analysis of models of parts… …   English World dictionary

  • photoelasticity — fototamprumas statusas T sritis fizika atitikmenys: angl. photoelasticity vok. Photoelastizität, f rus. фотоупругость, f pranc. photoélasticité, f …   Fizikos terminų žodynas

  • photoelasticity method — fototamprumo metodas statusas T sritis fizika atitikmenys: angl. photoelasticity method; photostress method vok. Methode der Spannungsoptik, f rus. метод фотоупругости, m pranc. méthode de photoélasticité, f …   Fizikos terminų žodynas

  • photoelasticity — noun a technique for studying and measuring the stresses and strains in an object by means of mechanical birefringence …   Wiktionary

  • Photoelasticity — Фотоупругость …   Краткий толковый словарь по полиграфии

  • photoelasticity — pho·to·elasticity …   English syllables

  • photoelasticity — /foʊtoʊˌilæsˈtɪsəti/ (say fohtoh.eelas tisuhtee) noun change in optical properties of transparent materials when subjected to stresses …  

  • photoelasticity — “+ noun Etymology: International Scientific Vocabulary phot + elasticity : the property exhibited by transparent isotropic solids of becoming doubly refracting when subjected to either tensile or compressive stress making possible a detailed… …   Useful english dictionary

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”