This view needs WebGL, which this browser isn't providing. The load–slip trace on the right still works.
Specimen split along the strand; the dashed outline is the removed half. Drag to orbit, scroll or pinch to zoom.
One strand, embedded in a split concrete specimen and pulled from a grip that stops it turning. Its twist is locked into a helical channel in the matrix, so it has to untwist to get out. The measured load holds on a plateau for almost the whole slip.