Stress Intensity Factors Pro is the easiest and most convenient way to calculate SIFs when and where you need to. Simply select from the available geometries, enter the loads and dimension, and the App will quickly give you the resulting "K". Share a PDF of the result via email or a print out.

Features include:
• Universal App (Designed for iPad and iPhone)
• Automatic conversion of the inputs and results between Imperial and Metric units
• Share your calculation via email or Air Print

Mode I "K" solutions included are:

Standard Specimen:
• Single Edge Notch in Tension
• Single Edge Notch in Bending
• Center Cracked in Tension
• Double Edge Notched in Tension
• Compact Specimen
• Disk Shaped Compact Specimen

Infinite Plates
• Through Crack in an Infinite Plate (also includes Mode II solution)
• Edge Crack in a Semi-Infinite Plate
• Surface Flaw in an Infinite Plate

Finite Plates
• Surface Flaw in a Flat Plate
• Embedded Flaw in a Flat Plate
• Corner Crack in a Flat Plate

Check out our other engineering apps by searching the iTunes store for:
• Pressure Vessel Pro
• Moments of Inertia
• Mohr's Circle
• Stress Concentrations Pro
or search J.R.Hobbs to see them all.

What’s New

Version 1.3

- Bug fixes.
- Updated for newer operating systems.

Ratings and Reviews

4.0 out of 5
1 Rating

1 Rating

bigthing ,

Stress Intensity factor

It would be nice if this APP had the normal and shear stress equations to plug in the KI values (stress intensity factor) that are calculated on this APP release. Please make it happen?

matty720 ,

Calculation Error

I used the single edge notched tension specimen using input values from textbook, Deformation and Fracture Mechanics of Engineering Materials, Hertzberg, and the stress intensity factor did not agree.

The formulas for each specimen should be given.

App Privacy

The developer, J.R.Hobbs, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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