feat(schema): mechanical sub-table additions (#151)#189
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Pure additive — no backwards-compat concern. New optional fields on
MechanicalProperties:
- flexural_modulus / flexural_strength (MPa) — plastics & ceramics
datasheets
- fatigue_limit (MPa) — cyclic gantry loads
- cti (V) — PCB substrate selection
- cte_anisotropic = [a, b, c] (ppm/K, list-of-3) — non-cubic crystals
like sapphire/quartz where direction-dependent thermal expansion
matters
- creep_rate = [{temp_K, stress_MPa, strain_per_hr}, ...] — sparse
creep measurements for cryostat long-term load planning. Stored as
a plain list[dict] (no special dataclass — points are sparse and
heterogeneous; consumers index by temp/stress as needed)
Plus matching `*_qty` Pint-Quantity accessors for the 4 new scalar
fields.
Tests: tests/test_mechanical_fields.py (8 tests) + full corpus
regression. 552 passed, 11 skipped, no regressions.
Closes #151
This was referenced May 6, 2026
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Summary
Pure additive — 5 new optional fields on
MechanicalProperties. No backwards-compat concern, no API surface change.flexural_modulusflexural_strengthfatigue_limitcticte_anisotropic[a, b, c]for non-cubic crystals (sapphire, quartz)creep_rate[{temp_K, stress_MPa, strain_per_hr}, ...]sparse points for cryostat long-term loadsPlus matching
*_qtyPint-Quantity accessors for the 4 new scalar fields.creep_rateis stored as a plainlist[dict]rather than a new dataclass — points are sparse and heterogeneous; consumers index by temp/stress as needed. Promotable to a structured type later if a real consumer surfaces.Test plan
pytest tests/test_mechanical_fields.py— 8 tests passruff checkclean,ruff formatno diffCloses #151