Legacy · Mechanical validation · §8.3.4 Case 2

Cyclic torsion / G*

Harmonic shear history — Case 2 of Section 8.3.4. Basis for a time/frequency-domain protocol.

Article: Part I · DOI 10.70271/rirc.v1n2a007

Material: Itumbiara

Reference figure

Item	Value
Radius	$R=0.5\,\mathrm{m}$
Twist	$\varphi(t)/L=(\varphi_0/L)[1+\kappa\sin\omega(t-z_0)]$
$\varphi_0/L$	$2\times10^{-4}\,\mathrm{m}^{-1}$
$\kappa$	$0.25$
$\omega$	$2\pi\,\mathrm{rad/d}$ (period $1\,\mathrm{d}$ )
Ages	$z_0=3\,\mathrm{d}$ and $z_0=28\,\mathrm{d}$
Material	Itumbiara

File	Content
ref_torcao_ciclica_z3.csv	$\tau(t)$ at $r=R$ , $z_0=3\,\mathrm{d}$
ref_torcao_ciclica_z28.csv	$\tau(t)$ at $r=R$ , $z_0=28\,\mathrm{d}$
ref_torcao_ciclica_pontos_controle.csv	$e_A$ , $e_\phi$ , Struik, $\lvert G^*\rvert$

Code: torsion_cyclic (package).