# Stress Intensity Factors Pro — Fracture Mechanics Calculator > Calculates Stress Intensity Factors (SIFs) for fracture mechanics. (iPhone/iPad app by J.R.Hobbs.) - Source: https://appshunter.io/ios/app/stress-intensity-factors-pro/id726473168 (this page in markdown: same URL + `.md`) - Developer: [J.R.Hobbs](https://appshunter.io/developer/395110523) - Category: Utilities, Education - Price: $5.99 - Rating: 4.00/5 from 1 App Store ratings · 2 written reviews indexed - Age rating: 4+ - Requires: iOS 12.0 · 10 MB - Languages: American English - Released: 2013-10-25 - Data updated: 2026-09-03 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/stress-intensity-factors-pro/id726473168/reviews.md ## What is 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. ## Key features - SIF calculations for multiple geometries - Input loads and dimensions - Automatic unit conversion (Imperial/Metric) - Share results via PDF (email/Air Print) - Universal app for iPad and iPhone ## Recent user reviews (2 of 2) All indexed reviews: https://appshunter.io/ios/app/stress-intensity-factors-pro/id726473168/reviews.md ### 4/5 — Stress Intensity factor *2014-10-09* 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? ### 1/5 — Calculation Error *2014-02-11* 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. ## Frequently asked questions about Stress Intensity Factors Pro ### What is Stress Intensity Factors Pro used for? Stress Intensity Factors Pro is used to calculate Stress Intensity Factors (SIFs) for various fracture mechanics geometries. It allows users to input loads and dimensions to quickly obtain the resulting "K" value. ### What geometries are supported by Stress Intensity Factors Pro? Stress Intensity Factors Pro supports a wide range of geometries including standard specimens like single edge notch, center cracked, and compact specimens, as well as infinite and finite plates with various crack configurations. ### Can I share my calculations from Stress Intensity Factors Pro? Yes, you can share your calculation results from Stress Intensity Factors Pro. The app allows you to share a PDF of the result via email or Air Print. ### Does Stress Intensity Factors Pro support different units? Yes, Stress Intensity Factors Pro features automatic conversion of inputs and results between Imperial and Metric units, making it versatile for users worldwide. ### What devices is Stress Intensity Factors Pro compatible with? Stress Intensity Factors Pro is a Universal App, designed to work on both iPad and iPhone devices. ### How much does Stress Intensity Factors Pro cost? Stress Intensity Factors Pro is a paid application, available for $1.99. There are no in-app purchases mentioned. ### When was Stress Intensity Factors Pro last updated? The latest version of Stress Intensity Factors Pro is 1.3, which was last updated on December 13, 2020. The app was initially released on October 25, 2013. ### What is the age rating for Stress Intensity Factors Pro? Stress Intensity Factors Pro has an age rating of 4+, making it suitable for a wide range of users. ## Version history (last 5 releases) ### 3.0.4 — 2026-07-13 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. ### 1.3 — 2020-12-13 - Bug fixes. - Updated for newer operating systems. ### 1.2.1 — 2017-10-19 - Bug fixes - Minor Updates ### 1.2 — 2017-10-12 - Updates for iOS11 - Bug Fixes ### 1.1 — 2014-10-08 - Updates fro iOS8 and iPhone 6 - Bug fixes ## Apps similar to Stress Intensity Factors Pro | App | Rating | Price | Category | | --- | --- | --- | --- | | [mechanical design engine](https://appshunter.io/ios/app/mechanical-design-engine/id1574341437) | — | Free | Utilities | | [Hardness Converter](https://appshunter.io/ios/app/hardness-converter/id371816611) | 5.0 (4) | Free | Utilities | | [Converter-Universal Conversion](https://appshunter.io/ios/app/converter-universal-conversion/id423521445) | 4.9 (897) | Free | Utilities | | [Mechanical Engineering Toolkit](https://appshunter.io/ios/app/mechanical-engineering-toolkit/id1601099443) | 4.8 (64) | Free | Utilities | | [SSI Steel Design](https://appshunter.io/ios/app/ssi-steel-design/id1474838160) | 3.0 (1) | Free | Utilities | | [SCADACore AGA Flow Calculator](https://appshunter.io/ios/app/scadacore-aga-flow-calculator/id1497352453) | — | Free | Utilities | ## More apps by J.R.Hobbs - [Mohr's Circle](https://appshunter.io/ios/app/mohrs-circle/id395110520) - [Moments of Inertia](https://appshunter.io/ios/app/moments-of-inertia/id494181506) - [Pressure Vessel Pro](https://appshunter.io/ios/app/pressure-vessel-pro/id535696875) - [Inspectix: Inspection Reports](https://appshunter.io/ios/app/inspectix-inspection-reports/id673877248) - [Stress Concentration Factors 2](https://appshunter.io/ios/app/stress-concentration-factors-2/id1296693579) All apps by J.R.Hobbs: https://appshunter.io/developer/395110523 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-03.*