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Schematic drawing of an ADCB experiment. A razor blade (black) is inserted between PET and glass. , crack opening; a, crack length; L, uncracked length. , height; , Young’s modulus; , Poisson’s ratio; subscript refer to glass, steel, respectively.
Front 1. (a1) Part of image at , showing metal roughness, wedge fringes where laminate has separated (left), brightness change at crack front. (a2) Part of image at . Arrow represents exaggerated displacement vector necessary to bring background into registry. (b) Pixelwise subtraction after image registration. (c) Thresholding. (d) Filling behind front. (e) Front. Insets: Example of treatment of holes. (c1) Type 2 hole in some image combined with front from . (d1) .
(a) Example of front 1. Grey line indicates the mean front position . (b) , light parts: , dark parts: . (c) Forward “acceleration” [with ] as a function of time and position along front. .
(a) Snapshot of front 2. (b) Image showing approximately 400 subsequent front positions. Front movement is mainly due to bursts parallel to the front. .
Propagation of front 2. All displacements with respect to front position at time zero. (a) . (b) [with ]. . (c) Sketches clarifying appearance in (b) of forward bursts (top) and laterally propagating forward steps.
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