Fig. 2: Hook-drop test.
a Sketch to show the hook-drop test, including the high-speed camera used to image the fibre. The camera is focused at a distance \(Z=10\,{{{\rm{cm}}}}\) below the initial hook position. b Summary of the measurements of the drop height \(\Delta H\) for tow types A and B. The 60 hook-drop measurements conducted for each tow are summarised via box and whisker plots (the boxes show the quartiles of the data while the whiskers indicate the maximum and minimum values of the drop distances). c Montage of high-speed images of a hook-drop test on tow A. Each image is time-stamped with time \(t=0\) the instant when the hook was released. d XCT reconstruction of the dense or knotted region ~2 mm below the arrested hook in the hook-drop test utilising tow A. The distribution of \(|\varphi |\) is overlaid on the fibres in this reconstruction.
