{"id":"chair-process-evidence-v1","contract":"For an engineering assembly, separate subsystem capability from whole-system performance. Deliver the calculable conventional baseline first. Keep optional treatments independent; their missing evidence must not invalidate established mechanics. Attach sources only to claims they support. A saved simulation verifies neither a treatment nor a manufactured object. Distinguish arithmetic checks, model applicability, material characterization, joint design, fabrication, inspection and independent full-assembly tests. Never substitute a hypothesis ranking for requested design deliverables.","baseline":{"classification":"calculated conditional example; not measured","inputs":{"mass_kg":100,"span_m":0.45,"width_m":0.45,"thickness_m":0.02,"gravity_m_s2":9.80665},"force_n":980.665,"equal_leg_reaction_n":245.16625,"center_bending_moment_nm":110.3248125,"section_second_moment_m4":3.0000000000000004e-7,"bending_stress_mpa":3.677493749999999,"equations":["F = m g","R = F/4 (four equal ideal support reactions)","M = F L/4 (separate simply-supported center-load beam idealization)","I = b t^3/12","stress = M(t/2)/I"],"assumptions":"Static occupant only, conventional standard gravity, separate ideal support and beam models. The full seat width is assumed to act as one rectangular beam. Not a plate/joint/contact model; no chair self-weight, impact, fatigue, grain defects, eccentricity or backrest forces.","allowable_stress_mpa":null,"deflection_m":null,"safety_factor":null,"chair_capacity_kg":null,"decision":"Calculated demands only; suitability and safety unresolved until actual materials, geometry, connections and tests are supplied."},"sources":[{"id":"chair-usda-wood-2021","title":"USDA Wood Handbook, Chapter 5 (2021)","source":"https://research.fs.usda.gov/treesearch/62244","text":"Reviewed abstract: wood properties vary, including with moisture and growth features such as knots and grain slope. This reference supports material variability, not an allowable stress for the proposed chair. No specimen grade, allowable strength or stiffness has been established.","evidence_type":"external-reference-summary","score":1,"topic":"material-properties","approval":"reference-only","retrieved_at":"2026-09-15"},{"id":"chair-nist-argon-20260915","title":"NIST ASD: neutral argon ionization energy","source":"https://physics.nist.gov/cgi-bin/ASD/ie.pl?spectra=argon&units=1","text":"Neutral ground-state argon first ionization energy is 15.7596119 ± 0.0000005 eV. The condition hf >= ionization energy is only single-photon energetic eligibility; it does not establish yield, surface-treatment benefit or chair performance.","evidence_type":"external-reference-summary","score":1,"topic":"ionization-threshold","approval":"reference-only","retrieved_at":"2026-09-15"}],"ionization":[{"ionization_material":"neutral ground-state argon; reference example only","photon_energy_ev":4.135667696923859e-9,"ionization_threshold_ev":15.7596119,"threshold_frequency_hz":3810657203363345,"single_photon_status":"below threshold","ionization_yield":"unknown: requires photon flux, cross sections, density and loss measurements","other_mechanisms":"Electron-impact, thermal and multiphoton ionization are not evaluated by this check.","process_role":"Candidate conditioning of existing feedstock before conventional fabrication; usefulness unvalidated.","next_state":"retain energy screening; human review and measurements required for material processing","source":"https://physics.nist.gov/cgi-bin/ASD/ie.pl?spectra=argon&units=1","evidence_classification":"calculation using evaluated reference data; no device measurement"},{"ionization_material":"neutral ground-state argon; reference example only","photon_energy_ev":16.542670787695435,"ionization_threshold_ev":15.7596119,"threshold_frequency_hz":3810657203363345,"single_photon_status":"energetically allowed; yield unknown","ionization_yield":"unknown: requires photon flux, cross sections, density and loss measurements","other_mechanisms":"Electron-impact, thermal and multiphoton ionization are not evaluated by this check.","process_role":"Candidate conditioning of existing feedstock before conventional fabrication; usefulness unvalidated.","next_state":"retain energy screening; human review and measurements required for material processing","source":"https://physics.nist.gov/cgi-bin/ASD/ie.pl?spectra=argon&units=1","evidence_classification":"calculation using evaluated reference data; no device measurement"}],"saved_run_links":["/api/simulations/run?run=24","/api/simulations/run?run=25"],"process":[{"step":"Requirements and use","state":"provisional","next":"Confirm intended use, occupant range, geometry and applicable seating standard."},{"step":"Load accounting","state":"calculated","next":"Compare static, eccentric, impact and repeated-load cases; only static example computed here."},{"step":"Materials and joints","state":"missing design inputs","next":"Select actual species/grade or panel specification, orientation, moisture, connections and published design properties."},{"step":"Optional ionization","state":"energy threshold calculated; treatment benefit unmeasured","next":"Independent treated/untreated comparison; it does not gate conventional chair development."},{"step":"Fabrication and inspection","state":"not executed","next":"Produce reviewed drawings and joint details before fabrication; record dimensions and defects."},{"step":"Whole-chair validation","state":"not performed","next":"Qualified review and suitable strength, stability, fatigue and durability tests. Obtain applicable standard; no certification claimed."}],"standards_reference":{"url":"https://www.bifma.org/page/StandardsShortDesc","status":"Candidate standard-selection reference only; full normative requirements not retrieved."},"physical_device_verified":false}