oracle: 2D cases (Kirsch plane stress, Lamé plane strain and axisymmetric, rotating disc and cylinder, NAFEMS LE1 with quad8) and J2 uniaxial explicit

The pending 2D LE1 case becomes a real one; the plasticity cases stay
pending with what they still need (static J2 for the collapse pressure,
the transcribed measurements for the Taylor bar).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm
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jyvikoandClaude Opus 5.5 authored and Irakli Kourtis committed 2026-10-13 21:42:19 -04:00
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# Uniaxial tension of a J2 bilinear-hardening cube to large strain (explicit)
A unit cube of one hex8 (one-point, hourglass control), steel-like (E = 200000, ν = 0.3,
σ_y = 250, H = 2000, ρ = 7.8e-9), held by symmetry on three faces and stretched on the fourth to
λ = e^0.2 over 0.01 s (quasi-static), lateral faces free: uniaxial stress at a logarithmic
strain of 0.2.