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

instrument / verified-clean

# Axial Stress & Strain Calculator

The current ledger marks this instrument verified clean within the source-bound verification corpus.

Status: **VERIFIED_CLEAN**Lifecycle: **verified-clean**

## Inspectable records

[01**Overview**Purpose and lifecycle](<https://guthlabs.ai/docs/instruments/axial-stress-strain-calculator/>)[02**Mechanism**Method and assumptions](<https://guthlabs.ai/docs/instruments/axial-stress-strain-calculator/mechanism/>)[03**Implementation**Binding and validation](<https://guthlabs.ai/docs/instruments/axial-stress-strain-calculator/implementation/>)[04**Qualification**Evidence and errata](<https://guthlabs.ai/docs/instruments/axial-stress-strain-calculator/qualification/>)

## Ledger state

The current ledger marks this instrument verified clean within the source-bound verification corpus.

**Area**: Mechanical, Civil & Structural Engineering — Statics/Dynamics, Strength of Materials, Machine Design, Civil, HVAC, Vibration

**Tranche**: tranche-4

**Evidence ID**: t4-034

**Ledger rows**: 1

No ledger note is attached.

## Review findings

NEEDS_REVIEW because the exact ambiguity is that the spec provides no units for P, A, L, or E and does not state the sign convention for P. The empty honest_label should be populated with the assumptions and limitations: uniform prismatic member, concentric axial load, linear elastic behavior, small strain, and required unit consistency.

### Formula and scope findings

No additional record

### Unit assumptions

- P is axial force, A is cross-sectional area, L is initial gauge length, and E is Young's modulus.

- P and A must use compatible force and area units so that σ=P/A has stress units.

- E must use the same stress units as σ.

- L and δ must use the same length units.

- ε is dimensionless.

- The formulas assume a prismatic member with uniform area, concentric axial loading, linear elastic material behavior, small strain, and negligible effects from self-weight or local stress concentrations.

## Boundary hardening

**BREAK_CLAIMED** · SELF_FLAGGED

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.

## Errata and corrections

No applied erratum is attached to this unique-name record.

## Inspectable example

4 review vectors are recorded. One source-bound sample is shown below.

````
{
  "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."
}
````

## Related workflows

[Beam & Column Structural Benchaxial](<https://guthlabs.ai/docs/instrument-workflows/structural-bench/>)

## Sources and evidence

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

- `VERIFIED_LEDGER.json · VERIFIED_CLEAN`

- `evidence-tranche4/tranche4-results.json`

- `BOUNDARY_HAZARD_CATALOG.json`