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0.2.7 WEDGE6 Plan and WP07 Boundary

T1-R prepared the formulation, mapping, quality and V&V contracts. Terra High authorized WP07 at T1-R4, and the six-node elemental kernel is now implemented with EXPERIMENTAL public maturity. The current evidence is recorded in 0_2_7_wedge6_kernel.md and qualification/0_2_7/wp07_state.json.

Design gate

WP07 could start only after WP03, WP05 and WP06 were reviewed. The Terra High T1-R4 review accepted the formulation and observable contract for this elemental implementation. WP08 remains the separate static workflow gate.

T1-R controlled inputs

  • qualification/0_2_7/wedge6_formulation_contract.json
  • qualification/0_2_7/wedge6_mapping_fixture.json
  • qualification/0_2_7/wp07_prerequisites.json

The first three inputs are retained pre-WP07 contracts and historical authorization records. The active implementation contract is wedge6_formulation_contract.json; executed evidence is stored separately.

Required design decisions

  • six-node prism topology, local node order and orientation;
  • shape functions and derivatives, including the physical Jacobian;
  • quadrature order and any reduced/selective integration decision;
  • face maps for TRI3 and QUAD4, outward-normal convention and boundary extraction;
  • load distribution for nodal, face traction and body-force inputs;
  • material/stress sampling and recovery/post-processing convention;
  • positive-volume/orientation and distortion diagnostics;
  • static route entry point and explicit unsupported analysis behavior;
  • same-mesh or controlled-mesh mapping for C3D6/PENTA6 correlation;
  • mixed-mesh policy. A mixed TET/WEDGE/HEX mesh is not supported merely because each individual element exists.

WP07 implementation boundary

  1. isolated shape/Jacobian and patch checks;
  2. elemental stiffness and strain/stress recovery checks;
  3. invalid-input and deterministic-replay checks;
  4. comparison of production and reference quadrature.

Assembly, boundary-face/load support, Gmsh import, reactions, modal/dynamic routes and external correlation remain later gates and are not implied by the WP07 PASS.

Explicit non-goals

WEDGE15, PYRAMID5, mixed-mesh support, geometric nonlinearity, J2, friction/contact, post-buckling and broad production claims are not implied by WEDGE6 static implementation.