# Stress Concentration Factors 2 — Engineering Calculations

> Calculates stress concentration factors and stresses for 26 engineering geometries. (iPhone/iPad app by Joel Hobbs.)

- Source: https://appshunter.io/ios/app/stress-concentration-factors-2/id1296693579 (this page in markdown: same URL + `.md`)
- Developer: [Joel Hobbs](https://appshunter.io/developer/395110523)
- Category: Education, Reference
- Price: $5.99
- Rating: 3.00/5 from 1 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 11 MB
- Languages: English
- Released: 2017-10-16
- Data updated: 2026-07-18
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/stress-concentration-factors-2/id1296693579/reviews.md

## What is Stress Concentration Factors 2?

Sometimes simple stress formulae are not enough. The real peak stresses in hardware occurs at geometric discontinuities such as notches, holes, & filets.  To get an accurate stress value, you need a stress concentration factor.  This app makes that easy.  Along with stress concentration factors, this app calculates the nominal and peak stresses, displays the equations, & easily prints or shares via email your result with a couple of taps.

Stress Concentration Factors 2 Features:

- Calculates the Stress Concentration Factor
- Units in Metric and English Systems
- Nominal Stress
- Peak Stress
- Designed for use on the iPhone, iPod Touch, & iPad
- Printing Capability
- Ability to email a PDF of the Geometry, Inputs, Equations, & Results

Stress Concentration Factors 2 calculates the stress concentration factors & displays the equations for 26 different geometries including:

Solutions:
   • Single U Notch in tension
   • Single U Notch in bending
   • Double U Notch in tension, bending, & out of plane bending
   • Single V Notch in bending
   • Infinite Row of U Notches in tension
   • Central Hole in tension
   • Central Hole in bending, & out of plane bending
   • Off Center Hole in tension & bending
   • Rectangular Hole in tension
   • Infinite Row of Holes in parallel & normal tension
   • Square Shoulder Fillet in Tension
   • Square Shoulder Fillet in Bending
   • U Notch Circular Shaft in tension
   • U Notch Circular Shaft bending & torsion
   • Stepped Circular Shaft in tension, bending, & torsion
   • Circular Shaft with a Radial Hole in tension, bending & torsion


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

## Key features

- Calculates Stress Concentration Factor
- Metric and English Units
- Nominal and Peak Stress Calculation
- Displays Equations
- Email/Print Results
- 26 Geometric Solutions

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/stress-concentration-factors-2/id1296693579/reviews.md

### 3/5 — Need References

*2018-09-06*

The app is easy to use. However, you need to include the source for the equations. In my work I need to verify the source of equations, otherwise it is just a black box.

## Frequently asked questions about Stress Concentration Factors 2

### What is Stress Concentration Factors 2 used for?

Stress Concentration Factors 2 is used to calculate stress concentration factors, nominal stress, and peak stress for 26 different geometric discontinuities. This is crucial for accurately assessing peak stresses in hardware where simple formulas are insufficient.

### What geometries are supported by Stress Concentration Factors 2?

The app supports 26 different geometries, including various notches, holes, fillets, and stepped shafts in tension, bending, and torsion. Examples include single U notches, central holes, and stepped circular shafts.

### Can I use Stress Concentration Factors 2 on different devices?

Yes, Stress Concentration Factors 2 is designed for use on the iPhone, iPod Touch, and iPad. It supports both Metric and English unit systems for calculations.

### How does Stress Concentration Factors 2 help with sharing results?

You can easily print your results or share them via email with just a couple of taps. The app can generate a PDF of the geometry, inputs, equations, and results for convenient sharing.

### What is the price of Stress Concentration Factors 2?

Stress Concentration Factors 2 is a paid application, priced at $5.99. It does not feature in-app purchases or advertisements.

### How often is Stress Concentration Factors 2 updated?

The latest version, 2.0.2, was released on May 31, 2023. The app was originally released on October 16, 2017, indicating periodic updates for improvements and compatibility.

### What is the age rating for Stress Concentration Factors 2?

Stress Concentration Factors 2 has an age rating of 4+. This indicates it is suitable for a wide audience, including younger users who may be learning about engineering concepts.

### Does Stress Concentration Factors 2 have ads?

No, Stress Concentration Factors 2 does not contain advertisements. It is a paid application that offers an ad-free experience for its users.

## Version history (last 4 releases)

### 3.0.4 — 2026-07-07

Bug fixes and other minor updates.

### 2.0.2 — 2023-05-31

-Bug fixes
-Other minor updates

### 2.0.1 — 2020-01-22

- Fixed issue where some schematics would not display.
- Misc bug fixes.
- Other minor updates.

### 2.0 — 2017-10-16

No release notes.

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## More apps by Joel 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](https://appshunter.io/ios/app/inspectix/id673877248)
- [Stress Intensity Factors Pro](https://appshunter.io/ios/app/stress-intensity-factors-pro/id726473168)

All apps by Joel Hobbs: https://appshunter.io/developer/395110523

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*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 2026-07-18.*