# Haigh-Westergaard coordinates / π-plane plots

**URL:** https://discourse.julialang.org/t/haigh-westergaard-coordinates-plane-plots/107335
**Category:** Visualization
**Created:** [December 8, 2023, 3:45pm UTC](https://discourse.julialang.org/t/haigh-westergaard-coordinates-plane-plots/107335 "2023-12-08T15:45:21Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![Gravlax](https://avatars.discourse-cdn.com/v4/letter/g/dbc845/32.png) [@Gravlax](https://discourse.julialang.org/u/Gravlax)
#### Post date: [December 8, 2023, 3:45pm UTC](https://discourse.julialang.org/t/haigh-westergaard-coordinates-plane-plots/107335/1 "2023-12-08T15:45:21Z")

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Hi,  
Does anyone have experience with this type of visualisation? Is there a package that supports this type of diagram?

> **[Stress space](https://en.wikipedia.org/wiki/Stress_space)**
>
> In continuum mechanics, Haigh–Westergaard stress space, or simply stress space is a 3-dimensional space in which the three spatial axes represent the three principal stresses of a body subject to stress. This space is named after Bernard Haigh and Harold M. Westergaard.
> In mathematical terms, H-W space can also be interpreted (understood) as a set of numerical markers of stress tensors orbits (with respect to proper rotations group – special orthogonal group SO3); every point of H-W space repres...

cheers and thanks!