THE FEUTEX TOOLKIT

Rectangular Strain Rosette

Recover planar strain and principal strain from 0°, 45° and 90° gauges.

Materials workspace● Runs in your browser

01 Your input

0 degree strainµstrain45 degree strainµstrain90 degree strainµstrain

02 Your result

View or copy raw result data

Result data

Formulaγxy=2ε45−ε0−ε90; principal strains follow the strain transformation.

Sources and model references

https://ocw.mit.edu/courses/1-050-solid-mechanics-fall-2004/resources/emech7_04/

Worked example

Inputs

0 degree strain: 100 µstrain
45 degree strain: 80 µstrain
90 degree strain: 20 µstrain

Expected results

Engineering shear strain: 40 µstrain
Major principal strain: 104.7213595 µstrain
Minor principal strain: 15.27864045 µstrain

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

Enter every input in the labeled units; use measured or independently specified properties.
Check the stated model assumptions before calculating.
Interpret the output as a model estimate and verify it independently for the intended application.

Try this example

{
  "e0": 100,
  "e45": 80,
  "e90": 20
}

Accuracy and scope

Coplanar, colocated gauges with correct orientations and small strain. Educational engineering estimate only; not structural or safety certification, equipment selection, or operating recommendations.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.