Source: https://guthlabs.ai/docs/instruments/thermal-stress-calculator/implementation/

instrument implementation / implementation-contract

# Thermal Stress Calculator implementation

A source-bound implementation contract for Thermal Stress 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**: t4-046

**Effect**: Computation or source lookup only

## Input and validation requirements

The extreme finite inputs produce a mathematical result of 10^613 Pa, which overflows JavaScript double-precision arithmetic to Infinity. The instrument should reject or range-check nonphysical/extreme inputs rather than present Infinity as a normal stress 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": {
    "E": 200000000000,
    "alpha": 0.000012,
    "delta_T": 50,
    "units": "E in Pa; alpha in 1/K; delta_T in K"
  },
  "expected_outputs": {
    "sigma_thermal_Pa": 120000000,
    "sigma_thermal_MPa": 120
  },
  "working": "σ = E × α × ΔT\n= 200,000,000,000 × 0.000012 × 50\n= 2,400,000 × 50\n= 120,000,000 Pa\n= 120 MPa\nLiteral formula result is positive; physically, under tensile-positive convention, restrained heating corresponds to -120 MPa compression."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/thermal-stress-calculator/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/thermal-stress-calculator/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/thermal-stress-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-tranche4/tranche4-results.json`