Source: https://guthlabs.ai/docs/instruments/impact-load-factor-calculator/implementation/

instrument implementation / implementation-contract

# Impact Load Factor Calculator implementation

A source-bound implementation contract for Impact Load Factor Calculator; deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## 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**: t5-179

**Effect**: Computation or source lookup only

## Input and validation requirements

The formula is undefined when static deflection is zero, and a negative signed height can produce a negative square-root radicand unless the input is explicitly interpreted as a nonnegative drop-height magnitude.

## 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": {
    "h": 0,
    "delta_st": 0.004,
    "static_stress": 80,
    "length_unit": "m",
    "stress_unit": "MPa"
  },
  "expected_outputs": {
    "impact_factor_n": 2,
    "dynamic_deflection": 0.008,
    "peak_stress": 160,
    "length_unit": "m",
    "stress_unit": "MPa"
  },
  "working": "2h/δst = 2·0/0.004 = 0. n = 1 + √(1 + 0) = 1 + 1 = 2. Dynamic deflection = n·δst = 2·0.004 = 0.008 m. Peak stress = n·σst = 2·80 = 160 MPa."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/impact-load-factor-calculator/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/impact-load-factor-calculator/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/impact-load-factor-calculator/qualification/>)

## Sources and evidence

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

- `VERIFIED_LEDGER.json`

- `evidence-tranche5/tranche5-results.json`