rdf:type |
qudt:QuantityKind |
dcterms:description |
When a ray of light passes through a photoelastic material, its electromagnetic wave components are resolved along the two principal stress directions and each component experiences a different refractive index due to the birefringence. The difference in the refractive indices leads to a relative phase retardation between the two components. Assuming a thin specimen made of isotropic materials, where two-dimensional photoelasticity is applicable, the magnitude of the relative retardation is given by the stress-optic law Δ=((2πt)/λ)C(σ₁-σ₂), where Δ is the induced retardation, C is the stress-optic coefficient, t is the specimen thickness, λ is the vacuum wavelength, and σ₁ and σ₂ are the first and second principal stresses, respectively. |
qudt:applicableUnit |
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qudt:hasDimensionVector |
qkdv:A0E0L1I0M-1H0T2D0 |
qudt:informativeReference |
https://en.wikipedia.org/w/index.php?title=Photoelasticity&oldid=1109858854#Experimental_principles |
qudt:latexDefinition |
When a ray of light passes through a photoelastic material, its electromagnetic wave components are resolved along the two principal stress directions and each component experiences a different refractive index due to the birefringence. The difference in the refractive indices leads to a relative phase retardation between the two components. Assuming a thin specimen made of isotropic materials, where two-dimensional photoelasticity is applicable, the magnitude of the relative retardation is given by the stress-optic law \(\Delta ={\frac {2\pi t}{\lambda }}C(\sigma _{1}-\sigma _{2})\), where \(\Delta\) is the induced retardation, \(C\) is the stress-optic coefficient, \(t\) is the specimen thickness, \(\lambda\) is the vacuum wavelength, and \(\sigma_1\) and \(\sigma_2\) are the first and second principal stresses, respectively. |
qudt:plainTextDescription |
“When a ray of light passes through a photoelastic material, its electromagnetic wave components are resolved along the two principal stress directions and each component experiences a different refractive index due to the birefringence. The difference in the refractive indices leads to a relative phase retardation between the two components. Assuming a thin specimen made of isotropic materials, where two-dimensional photoelasticity is applicable, the magnitude of the relative retardation is given by the stress-optic law Δ=((2πt)/λ)C(σ₁-σ₂), where Δ is the induced retardation, C is the stress-optic coefficient, t is the specimen thickness, λ is the vacuum wavelength, and σ₁ and σ₂ are the first and second principal stresses, respectively.” |
qudt:qkdvDenominator |
qkdv:A0E0L0I0M1H0T-2D0 |
qudt:qkdvNumerator |
qkdv:A0E0L1I0M0H0T0D0 |
rdfs:comment |
“Applicable units are those of quantitykind:StressOpticCoefficient” |
rdfs:isDefinedBy |
http://qudt.org/3.1.10/vocab/quantitykind |
rdfs:label |
“Stress-Optic Coefficient”@en |
