feat(tensile_coupons): initial dataset & dictionary

[pierreleripoll]

Initial data drop for the Tensile Coupons subtab under Materials (tracks RESSLab-Team/resslab-hub#230).

Contents

• tensile_coupons/tensile_coupons.csv — 15 specimens × 70 columns (Wen, Skiadopoulos, Ashida & Lignos, 2026)
• tensile_coupons/tensile_coupons_data_dictionary.csv — dictionary drafted from descripton_of_items_19_04_2026.docx + master CSV
• tensile_coupons/stress_strain/{specimen_id}.csv — 15 engineering stress-strain curves, id-as-filename
• README.md — added tensile_coupons/ to the supported directories list

Points for @dlignos & @andskia

1. Column renames (SQLAlchemy/Python reject % in identifiers — CSV and dictionary both updated):
   • specimen_id → id (codegen treats only the literal id as the primary key, matching every other table)
   • yield_stress_02%__mpa_ → yield_stress_02__mpa_, yield_strain_02% → yield_strain_02
   • elongation_at_fracture__%_ / elongation_after_fracture__%_ / reduction_of_area__%_ → drop the __%_ suffix (unit % stays in the dictionary)
   • Chemical composition c__%_…fe__%_ → c…fe (matches the Materials DB convention)
2. bin_discont_yield stored as yes/no instead of 1/0 — the uploader's Boolean convention (used by columns.cfe and connections.slab/backing_bar/aisc_pz_violation_*) is case-insensitive yes/no. NA stays as-is.
3. b, zr, sn, ca, h, fe are 100% NA in the current 15 rows. Kept as DecimalFloat, nullable=True with placeholder example values — swap in real ones if available.

[dlignos]

Initial data drop for the Tensile Coupons subtab under Materials (tracks RESSLab-Team/resslab-hub#230).

Contents

• tensile_coupons/tensile_coupons.csv — 15 specimens × 70 columns (Wen, Skiadopoulos, Ashida & Lignos, 2026)
• tensile_coupons/tensile_coupons_data_dictionary.csv — dictionary drafted from descripton_of_items_19_04_2026.docx + master CSV
• tensile_coupons/stress_strain/{specimen_id}.csv — 15 engineering stress-strain curves, id-as-filename
• README.md — added tensile_coupons/ to the supported directories list

Points for @dlignos & @andskia

1. Column renames (SQLAlchemy/Python reject % in identifiers — CSV and dictionary both updated):

   • specimen_id → id (codegen treats only the literal id as the primary key, matching every other table)

DL: OK

• yield_stress_02%__mpa_ → yield_stress_02__mpa_, yield_strain_02% → yield_strain_02

DL: OK

• elongation_at_fracture__%_ / elongation_after_fracture__%_ / reduction_of_area__%_ → drop the __%_ suffix (unit % stays in the dictionary)

DL: OK

• Chemical composition c__%_…fe__%_ → c…fe (matches the Materials DB convention)

DL: OK

2. bin_discont_yield stored as yes/no instead of 1/0 — the uploader's Boolean convention (used by columns.cfe and connections.slab/backing_bar/aisc_pz_violation_*) is case-insensitive yes/no. NA stays as-is.

DL: OK

3. b, zr, sn, ca, h, fe are 100% NA in the current 15 rows. Kept as DecimalFloat, nullable=True with placeholder example values — swap in real ones if available.

DL: OK

@pierreleripoll see under each one of your points - overall we agree with the adaptations.

[dlignos]

@pierreleripoll all clear - this is correct.