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About Stress Intensity Factors Pro

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 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 3.0.4 · Updated July 13, 2026

Stress Intensity Factors Pro is a professional fracture mechanics calculator for engineers, students, and researchers. Calculate Mode I stress intensity factors quickly using proven solutions for a broad range of crack and flaw geometries. Simply choose a geometry, enter the dimensions and loading, and the app calculates the resulting stress intensity factor (K). Save calculations, add notes, and generate professional PDF reports for documentation, review, or sharing. Features • Fast stress intensity factor (K) calculations for common fracture mechanics geometries • Built-in support for fracture toughness values and engineering workflows • Automatic conversion between Imperial and Metric units • Save and revisit calculations • Add notes to solution sets • Generate and share professional PDF reports • Designed for both iPhone and iPad Included Mode I Solutions Standard Specimens • 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 (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 Designed for practical engineering use, Stress Intensity Factors Pro provides quick, reliable calculations in the office, the laboratory, or the field. Also available from J.R. Hobbs: • Pressure Vessel Pro • Moments of Inertia • Mohr's Circle • Stress Concentrations Pro Search the App Store for "J.R. Hobbs" to see our complete collection of engineering tools.

App privacy

The developer, J.R.Hobbs, reported these privacy practices to Apple.

Data Not Collected

The developer does not collect any data from this app.

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