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 bar striking a rigid wall (explicit)
A bar 10 × 0.1 × 0.1 of 200 one-point hex8 elements (E = 10⁴, ρ = 1, ν = 0, c = 100) moving at v₀ = 0.1 towards a frictionless rigid wall at x = 0 (its end face is the contact set); linear bulk viscosity off. Solved to t = 0.3: in contact from 0 to 2L/c = 0.2, then free at +v₀.