Material properties calculator

Fracture Toughness Calculator

Calculate stress intensity for crack-growth and brittle fracture screening.

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Calculator

Enter material values

Select units beside each input. Results update automatically as soon as enough values are entered.

Materials

Geometry factor Y
Applied stress Pa
Crack length a m

Result

About this calculator

How it works

Fracture toughness calculations estimate stress intensity near a crack tip. Geometry factor and crack definition must match the chosen reference solution.

Formulas

Formulas used

Stress intensity

K = Y sigma sqrt(pi a)

Worked example

Example calculation

Stress intensity

K = 1.12 x 250 MPa x sqrt(pi x 0.005) = 35.1 MPa sqrt(m)

Guide

How to use this calculator

Enter the measured material, load, geometry, strain, or thermal values requested by the calculator.
Select the units beside each input where a unit menu is shown.
Use the highlighted result for the main property, then review the supporting values for context.

Reference

What the results mean

Stress intensity

Crack-tip loading severity.

Critical comparison

Compare K to material fracture toughness using consistent crack geometry assumptions.

Assumptions and limits

Before using the result

Inputs are treated as representative engineering values from a test, datasheet, or early design estimate.
Material properties vary with grade, heat treatment, temperature, strain rate, moisture, manufacturing route, and test method.
Use verified material data, applicable standards, safety factors, and qualified engineering judgement for final design or failure analysis.

FAQ