Upon my migration to Duke, one of the things that I endeavored to learn were the tools of the trade here; specifically, image processing techniques. The expert on stress chains is Dan Howell. Please see his web-page for more information.
Stress chains in 2-D in an annular arrangement sheared by rotation of the inner cylinder. The picture, taken through crossed polarizers, shows high intensity (red) in areas of high stress.
3D transform of the previous image, with the color re-scaled. Height,
and thus intensity are a measure of the stress in the image.
 Duke Physics |
 CNCS |
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