Moment of Inertia / Section Properties Calculator 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

t3-010

Effect

Computation or source lookup only

Input and validation requirements

Zero dimensions create invalid zero-area sections and undefined radius of gyration or section modulus, while the specification does not state required positive-dimension validation. Axis selection and unspecified units can also produce materially different outputs if conventions are not made explicit.

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": {
    "section_type": "solid_rectangle",
    "b": 200,
    "h": 300,
    "length_unit": "mm",
    "axis": "centroidal horizontal x-axis",
    "y_reference": "bottom edge"
  },
  "expected_outputs": {
    "A": 60000,
    "y_bar": 150,
    "I": 450000000,
    "S": 3000000,
    "r": 86.6025
  },
  "working": "A=b×h=200×300=60,000 mm². ȳ=h/2=300/2=150 mm. I=bh³/12=200×300³/12=200×27,000,000/12=5,400,000,000/12=450,000,000 mm⁴. c=h/2=150 mm. S=I/c=450,000,000/150=3,000,000 mm³. r=√(I/A)=√(450,000,000/60,000)=√7,500=86.6025 mm."
}

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-tranche3/tranche3-results.json