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

instrument implementation / implementation-contract

# Axial Stress & Strain Calculator implementation

A source-bound implementation contract for Axial Stress & Strain 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**: t4-034

**Effect**: Computation or source lookup only

## Input and validation requirements

An input of A=0 makes sigma and delta undefined through division by zero; the calculator should reject it rather than expose non-finite JavaScript results.

## 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": {
    "P": 20000,
    "P_unit": "N",
    "A": 400,
    "A_unit": "mm^2",
    "L": 2000,
    "L_unit": "mm",
    "E": 200000,
    "E_unit": "N/mm^2"
  },
  "expected_outputs": {
    "σ": "50 MPa",
    "ε": "0.00025",
    "δ": "0.5 mm"
  },
  "working": "σ=P/A=20000/400=50 N/mm^2=50 MPa. ε=σ/E=50/200000=0.00025. δ=PL/(AE)=(20000×2000)/(400×200000)=40000000/80000000=0.5 mm."
}
````

## Other records

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