forked from 1b-agent/fieldcraft-upstream
jyvikoandClaude Opus 5.5
a91ac5baf9
An oracle case of a block pressed on another and slid with static and kinetic coefficients (mu_k N carried once slipping), and the docs of the friction formulation; ROADMAP M7 and parity updated. Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01UhhZMBTviDQxZvwnyP89fo
Coulomb friction: a block slid on another (implicit mortar contact)
A unit cube (2 × 2 × 2 hex8) on a 2 × 1 × 1 block (6 × 3 × 2 hex8), meshes not matching, E = 1000, ν = 0.3. The base of the lower block is held; the top of the upper block is pressed down by 0.02 and moved 0.1 sideways in proportion over one nonlinear static step without nonlinear geometry. The contact pair has μ_s = 0.3 and μ_k = 0.2: the sideways demand far exceeds the friction, so the interface slips, with the kinetic coefficient once the nodes slip, and carries μ_k N.