forked from 1b-agent/fieldcraft-upstream
jyvikoandClaude Opus 5.5
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Theory cases for the nonlinear solver, each frozen as a fixture: uniaxial stretch of a neo-Hookean block to twice its length (closed form), the nonlinear patch test on a distorted hex8 mesh, a quarter turn of the same mesh (objectivity: zero stress), the elastica of a hex20 cantilever at P L²/(E I) = 1, 2, 5, 10 against Bisshopp–Drucker (0.2–0.5 %), and the inflation of a thick neo-Hookean tube by a follower pressure against Rivlin's closed form (0.08 % at the bore). A finite-strain Cook's membrane is pending its transcribed reference. docs/fem.md describes the formulation, the material point interface, the follower-pressure choice and what nonlinear steps refuse; the literature, parity and roadmap pages follow. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm
Cook's membrane at finite strain (pending)
Waits for its reference value: the finite-strain Cook's membrane is defined (load, μ, κ) and answered in papers we have not transcribed, and no value is entered from memory. FieldCraft solves the model today (hybrid hex20 one element thick in plane strain, or plane strain quad8 for compressible materials); the case becomes active when the published numbers are copied in with their table.