{"reviewed_on":"2026-09-19","scope":"40 spring families with CAD and declared-data screens. This is not all possible spring checks or full DIN/ISO conformity. Inventory-only standards remain unimplemented.","items":[{"id":"SPRING-01","status":"implemented","feature":"Precise CAD envelope along a declared axis; body count; circular wire-end and plain bar/tube measurements","limits":"No automatic active-coil, helix, support or installed-state recognition. Circular spline ends require area/perimeter and radial residual checks; finer tolerances remain unassessed."},{"id":"SPRING-02","status":"implemented","feature":"Public compression and extension scope boundaries","standards":["DIN EN 13906-1:2013-11","DIN EN 13906-2:2013-09"],"limits":"Cold compression and cold/hot extension dimensions from declared data; no invented hot-compression limits or strength tables."},{"id":"SPRING-03","status":"implemented","feature":"Round-wire compression/extension, coil/leg torsion, circular bar/tube torsion and rectangular leaf calculations","limits":"Confirmed linear model, explicit dimensions and sourced modulus required. Coil-body Wahl shear or nominal bending/bar stresses only; no hook/end stress or inferred allowables."},{"id":"SPRING-04","status":"implemented","feature":"Disc force, tangent rate and energy, with ideal series/parallel stacks","limits":"Identical constant-thickness discs without contact flats, slots or inversion; no friction, normative stress points or life qualification."},{"id":"SPRING-05","status":"implemented","feature":"Supplier/test curve interpolation, local rate and work for nonlinear families","limits":"2–100 ordered pairs, no extrapolation. Negative slope remains an explicit stability question. Curve conditions must match the application; work is not hysteresis loss."},{"id":"SPRING-06","status":"implemented","feature":"Declared envelope, travel, force/torque, rate, stress, solid-height reserve, free-state guide/housing and critical-buckling limits; effective-mass frequency","limits":"No inferred solid height, loaded diameter, buckling factor or coil surge. All acceptance limits require a drawing/supplier reference."},{"id":"SPRING-07","priority":1,"status":"needs_geometry_and_design_data","feature":"Pitch/radius variation, active/end turns, handedness, end squareness, hook/eye/leg geometry and loaded clearances","requires":["Robust recognition of trimmed sweeps and ground ends","Explicit free/installed state and support/contact geometry","Reference models, tolerances and nonlinear validation"]},{"id":"SPRING-08","priority":1,"status":"needs_material_and_load_data","feature":"Fatigue life, Haigh/Goodman diagrams, accumulated damage, temperature/corrosion derating and relaxation","requires":["Grade/diameter/process-specific fatigue data and corrections","Load spectrum, stress ratio, survival probability and target cycles","Qualified material and test evidence"]},{"id":"SPRING-09","priority":1,"status":"needs_geometry_and_test_data","feature":"Hook/bridge/end stress, buckling modes, internal coil surge and resonance clearance","requires":["Boundary conditions, directions, damping and excitation spectrum","Validated nonlinear geometry/FE models or supplier results"]},{"id":"SPRING-10","priority":1,"status":"needs_authorised_requirements_and_tests","feature":"Complete EN 13906, EN 16983/16984 and ISO 19690 conformity","standards":["DIN EN 13906-1:2013-11","DIN EN 13906-2:2013-09","DIN EN 13906-3:2014-06","DIN EN 16983:2017-09","DIN EN 16984:2017-09","ISO 19690-1:2017","ISO 19690-2:2018","ISO 19690-2:2018/Amd 1:2025"],"requires":["Authorised edition-specific clauses, factors, tolerances and worked examples","Production and inspection evidence"]},{"id":"SPRING-11","priority":2,"status":"needs_supplier_models","feature":"Analytic wave, progressive coil, die, nested, volute, spiral and constant-force contact models","requires":["Section/end geometry, friction, preload and manufacturing factors","Validated supplier curves and physical reference results"]},{"id":"SPRING-12","priority":2,"status":"needs_material_models","feature":"Elastomer, gas/air, bellows, magnetic, composite and shape-memory constitutive models","requires":["Family-specific temperature, pressure, field, rate and hysteresis data","Qualification evidence, including containment where applicable"]},{"id":"SPRING-13","priority":2,"status":"needs_inspection_evidence","feature":"ISO 22705 testing, ISO 26910 shot peening, ISO 16249 coatings and material certificates","requires":["Applicable edition and authorised procedure details","Traceable production/test results with uncertainty"]},{"id":"SPRING-14","priority":3,"status":"needs_application_scope","feature":"Application/product norms outside ICS 21.160 and safe automatic geometry repair","requires":["Tooling/rail/vehicle or other application requirements","Assembly loads and a constraint-preserving CAD feature model","Revalidation of every affected load case"]}]}