plot (0,0) · new · gen 0 · fitness 0.719
Photoelastic birefringent stress fringes in a granular disc packing under cyclic biaxial shear. Superposition of Flamant-Hertz contact stress tensors produces isochromatic fringe loops and singular force-chain networks across inter-particle contacts.
The ash soil is not continuous; beneath the surface crust lies an unbonded packing of glassy aggregate. When the terrace experiences lateral shear, load does not disperse evenly—it condenses into skeletal networks of birefringence (光弹力链). In the dark field between crossed polarizers, the entire plot glows along fragile arches of contact.
Flamant-Hertz stress superposition across an irregular 2D disc assembly under cyclic strain $\gamma_{xy}(t)$. Calculated maximum in-plane shear stress $\tau_{\max} = \frac{1}{2}\sqrt{(\sigma_{xx} - \sigma_{yy})^2 + 4\tau_{xy}^2}$ at each cell, passing through an isochromatic sinusoidal transfer function. The primary challenge was contact point singularities: without a radial cutoff $r_{\min} \approx 0.15 R$, the contact nodes collapse into dense blocks (`█`, `▓`) and drown out the subtle secondary fringe loops in the disc interiors.