forked from 1b-agent/fieldcraft-upstream
jyvikoandClaude Opus 5.5
ca02c01e1f
The large-deformation explicit core of #42 (objective stress rates, updated kinematics) moves the bar wave and rigid-wall impact results by a few 1e-4 relative; both still pass their references (u_end 0.034%, rebound KE -0.54%). Fixtures updated deliberately for that change. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm
Elastic wave in a bar from a pressure step (explicit)
A bar 10 × 0.1 × 0.1 of 200 one-point hex8 elements (E = 10⁴, ρ = 1, ν = 0, so c = 100) with a pressure step of 1 on its end x = 10, solved explicitly to t = 0.06 (the front has travelled 6).