Stress Concentration Factor Lookup implementation

Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

Record owner

Guth Instruments

Lifecycle

verified-clean

Evidence ID

t7-002

Effect

Computation or source lookup only

Input and validation requirements

The stated instrument depends on Peterson chart data or curve-fit coefficients that are not provided. Consequently, valid finite geometries such as r/d = 0.1 and D/d = 2 cannot produce numerical Kt values from this specification alone. The instrument also has explicit failure points at r/d = 0 and d = 0 that require rejection or an unbounded/undefined result.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

{
  "inputs": {
    "feature_type": "circular hole in effectively infinite plate",
    "load_type": "uniaxial tension",
    "hole_diameter_mm": 20,
    "plate_width_mm": "infinite",
    "sigma_nom_MPa": 100
  },
  "expected_outputs": {
    "Kt": 3,
    "sigma_max_MPa": 300
  },
  "reference_data": {
    "geometry": "circular hole, d/W -> 0",
    "Kt": 3,
    "source_convention": "Peterson's Stress Concentration Factors, standard circular-hole infinite-plate tension entry; widely tabulated standard value"
  },
  "working": "1. Boundary ratio: d/W -> 0, so use the infinite-plate row. 2. Kt = 3. 3. σmax = Kt·σnom = 3·100 MPa = 300 MPa."
}

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche7/tranche7-results.json