feat(data): add CFRP T700/epoxy and G10 composite laminates (#138, #139)#210
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Closes #138 (CFRP T700/epoxy laminate) and #139 (G10 glass-epoxy laminate). Both materials are anisotropic structural composites added to plastics.toml. The schema is scalar, so a single canonical orientation is reported per property and the orientation/V_f/temperature assumptions are documented in each per-property `_sources.note`. CFRP T700S/epoxy (`pymat.cfrp_t700`): - Toray T700S unidirectional ply at 60% fiber volume, Toray 2500 / 120 degC epoxy resin, room temperature, 0deg fiber direction. - Mechanical/thermal/electrical from the Toray T700S commercial data sheet (toraycma.com/toray-cfe.com, July 2024 release). - CTE is correctly negative (-0.38e-6 /K) along the fiber axis — typical for aligned PAN carbon fibers; transverse CTE (~+30e-6 /K) is not stored. G-10 / G-10CR (`pymat.g10`): - Mechanical (E_warp, sigma_t, sigma_c, nu, density) from Kasen et al. (1980), NBS characterization, manufacturer A production plant, 295 K, warp direction (DOI 10.1007/978-1-4613-9859-2_24, Adv. Cryogenic Eng. 26, 235). License `proprietary-reference-only`. - Thermal (k_warp, Cp, alpha_warp) computed from the NIST Cryogenic Material Properties G-10CR polynomial curve fits at T = 293 K (https://trc.nist.gov/cryogenics/materials/G-10%20CR%20Fiberglass%20Epoxy/). License `PD-USGov`. - Electrical (volume resistivity, breakdown voltage) from Kasen Table III. - G-10CR meets NEMA G-10 spec; values are canonical for both grades. Both entries are registered in `_CATEGORY_BASES["plastics"]` so `from pymat import g10, cfrp_t700` works through the lazy loader.
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Summary
Adds two anisotropic structural composite laminates to
src/pymat/data/plastics.toml. Both stored as scalars in the canonical orientation (warp / 0deg fiber direction) with V_f, resin, and orientation documented in each per-property_sources.note. Closes #138 and #139.pymat.cfrp_t700— Toray T700S UD ply, 60% Vf, Toray 2500 / 120 degC epoxy, RT, 0deg.pymat.g10— NEMA G-10 / G-10CR glass-cloth/epoxy, 295 K, warp direction.cfrp_t700(UD, 60% Vf, 0deg)g10(G-10CR, warp)For CFRP, transverse (90deg) modulus / strength / k / CTE are intentionally not stored: the schema is scalar and a single number cannot capture the ~3x quasi-iso vs UD-0deg gap or the +30e-6 /K transverse CTE. Notes in
_sourcesflag this for each affected property. For G-10, fill direction is ~0.65-0.80 of warp (Kasen Table I); normal-direction k and CTE differ from warp by ~0.7x and ~3.6x respectively, also documented in notes.CFRP CTE is negative (-0.38e-6 /K) along the fiber axis — this is correct, not a sign error. Aligned PAN carbon fibers contract on heating along the fiber axis; the data sheet quotes this directly.
Primary citations
proprietary-reference-only.PD-USGov.proprietary-reference-only.Assumptions / fields intentionally omitted
cfrp_t700._sources._default.note.youngs_modulus_curve/thermal_conductivity_curve(Schema: T-dependent property curves #148 T-dependent) added in this PR despite NIST polynomial availability — scope-limited to scalar entries; Schema: T-dependent property curves #148 curve adoption is a follow-up if needed.Test plan
python -c 'import tomllib; tomllib.loads(open("src/pymat/data/plastics.toml").read())'parses cleanlypython scripts/check_licenses.py— 7 TOMLs, no issuesuv run python -m pytest tests/test_toml_integrity.py tests/test_sources.py— 43 passeduv run python -m pytest(full suite) — 628 passed, 24 skippeduv run ruff check . && uv run ruff format --check .— cleanfrom pymat import g10, cfrp_t700; g10.density == 1.904; cfrp_t700.thermal_expansion == -3.8e-7; g10.source_of("thermal.thermal_conductivity")returns NIST PD-USGov source