# MohrsCircles — Stress in crystal plasticity

> Stress in crystal plasticity (iPhone/iPad app by Jorg Gollnick.)

- Source: https://appshunter.io/ios/app/mohrscircles/id6762085454 (this page in markdown: same URL + `.md`)
- Developer: [Jorg Gollnick](https://appshunter.io/developer/1892840211)
- Category: Education
- Price: $2.99
- Age rating: 4+
- Requires: iOS 18.6 · 35 MB
- Languages: English, French, German, Italian, Chinese, Spanish
- Released: 2026-04-23
- Data updated: 2026-06-16
- User reviews in markdown: https://appshunter.io/ios/app/mohrscircles/id6762085454/reviews.md

## What is MohrsCircles?

Master the Mechanics of Materials 

The Mohr’s Circle Interactive Analysis app is an educational tool, designed to demystify complex stress states. This app provides a seamless, visual, and mathematically rigorous experience to correlate arbitrary stress states with the theory of maximal shear stress according to Tresca. 

Why Mohr’s Circle?
In structural and mechanical engineering, understanding how stress transforms at different angles is critical. Our app goes beyond static textbooks by providing a real-time, interactive simulation where you can see the relationship between input stresses and the resulting Mohr’s Circle instantly.

Theoretical Foundation & Background:
To ensure a deep conceptual understanding, the app includes integrated educational slides. These slides break down the underlying mathematics and physical principles, providing the necessary context to bridge the gap between numerical input and mechanical theory.

Key Features for Academic Study:

Comprehensive Theory Slides: Learn the mathematical derivation of stress transformation equations directly within the app.

Tresca Criterion Visualization: Correlate arbitrary stress states with the theory of maximum shear stress (Tresca) to understand the onset of yielding.

Dynamic 3D Visualization: Watch a 3D stress element (cube) rotate in real-time as you adjust parameters. This visual feedback is crucial for understanding the spatial orientation of principal planes.

Focus on Crystal Plasticity: Explore the conceptual link between macroscopic stress tensors and the microscopic origins of material deformation.

Important Notice & Disclaimer:
This application is strictly intended for academic and educational purposes only. It is designed as a visual aid for theoretical study and classroom demonstrations. The results are based on idealized mathematical models and must not be used for engineering design, structural analysis, or any professional/practical application.


## Version history (last 4 releases)

### 1.3 — 2026-06-04

New feature: ShearStressChallenge to identify maximal shear stress states. The most important stress state for crystal elasticity and plasticity. User can now play with sliders to find maximal shear stress. Sliders will have rest points at appropriate angles. Easy and fun, find at least three of six possible angle-sets to solve the challenge. 
Improved arrangements of optical elements according to different display sizes. Parentheses around Matrix to improve intuitive recognition. Brighter coloring in dark Mode, especially in Mohr’s circles view. 

AutoScaling of Mohr’s circles view integrated 
Fixed hydrostatic stress

New languages: Italian and Chinese (simple)

### 1.2 — 2026-05-02

Graphical correction

### 1.1 — 2026-05-01

Double tap on slider to reset
Info in Menu about App showing Version

### 1.0 — 2026-04-23

No release notes.

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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 2026-06-16.*