FESADev/phases/analysis-model-objects/step3.md

Step 3: mitc4-element-model

Read First

Read these files before editing:

• /AGENTS.md
• /docs/AGENT_RULES.md
• /docs/ARCHITECTURE.md
• /docs/implementation-plans/analysis-model-objects-implementation-plan.md
• /include/fesa/element/Element.hpp
• /include/fesa/core/ElementDefinition.hpp

Task

Add a MITC4 element model object skeleton.

Allowed files:

• Create /include/fesa/element/Mitc4Element.hpp
• Create /src/element/Mitc4Element.cpp
• Create /tests/element/mitc4_element_model_test.cpp
• Modify /CMakeLists.txt

Required behavior:

• Mitc4Element derives from Element.
• Stores element id, four node ids, and property id.
• Reports ElementType::Mitc4.
• Reports nodeCount() == 4.
• Reports dofCount() == 24.
• Preserves connectivity order.

Tests To Write First

Write /tests/element/mitc4_element_model_test.cpp before production changes:

• Construct Mitc4Element.
• Access it through const Element&.
• Verify id, type, node count, DOF count, connectivity, and property id.

Run targeted build and confirm RED because Mitc4Element.hpp is missing.

Acceptance Criteria

Run:

python scripts/validate_workspace.py
ctest --test-dir build/msvc-debug --output-on-failure -C Debug -R model-object

Update step 3 status.

Do Not

• Do not implement element stiffness, Jacobians, MITC shear interpolation, resultants, stress, or integration-point state.