# Resolve RDF Terms

Data based on @zazuko/vocabularies
quantitykind:StressOpticCoefficient
http://qudt.org/vocab/quantitykind/StressOpticCoefficient

### Recommended prefix

quantitykind:

lang:en
Stress-Optic Coefficient
lang:""
https://en.wikipedia.org/w/index.php?title=Photoelasticity&oldid=1109858854#Experimental_principles
lang:""
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.
lang:""
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.