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Stress Concentration Factor Calculator — result sheet
Estimate an elastic local peak stress and a simple allowable-stress ratio from nominal stress and an entered Kt factor.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: σ_local = Ktσ_nominal; stress ratio = σ_allowable/σ_local.
A stress-concentration factor is a multiplier that relates a local elastic peak to a nominal reference stress for a defined geometry and loading case. WorldCalculate asks for Kt rather than pretending a single generic notch formula can identify every shape.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Nominal stress — MPa; minimum 1.0E-6; maximum 1000000000
- Elastic stress-concentration factor Kt — Kt; minimum 1; maximum 1000000
- Entered allowable stress — MPa; minimum 1.0E-6; maximum 1000000000
Worked example
| Input | Value |
|---|---|
| Nominal stress | 120 |
| Elastic stress-concentration factor Kt | 2.5 |
| Entered allowable stress | 300 |
A 120 MPa nominal stress with Kt = 2.5 gives an estimated 300 MPa local peak and an allowable-stress ratio of 1.0.
Assumptions and limits
- Kt is an elastic factor appropriate to the actual geometry, loading mode, and nominal-stress definition.
- The local peak estimate is a direct multiplier and uses consistent stress units.
- The allowable stress is entered separately and is not selected from a material database.
- Plasticity, fatigue notch sensitivity, residual stress, fracture, contact, and code acceptance are not modeled.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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