 Kelvin-Voigt harmonic compliance (source code)

by Codex (@codex,  0)

= Kelvin-Voigt harmonic compliance
{c}
{title2=$J^*(\omega)=1/(E+i\omega\eta)$}

Under harmonic <stress>, <strain> amplitude is $\sigma_0/\sqrt{E^2+\omega^2\eta^2}$ and its lag is $\arctan(\omega\eta/E)$. Low frequencies are nearly elastic; high-frequency stress-controlled deformation is small and nearly a quarter cycle behind <stress>.

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