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Fig. 7 | Heritage Science

Fig. 7

From: Fracture saturation in paintings makes them less vulnerable to environmental variations in museums

Fig. 7

Energy release rate GI for a sub-surface flaw. The parameter was determined for varying gesso stiffness, flaw length h (0.01–0.4 mm) and position H, and upper (solid circles) and lower (open triangles) tips of sub-surface flaws. The highest value of GI for a flaw of length h = 0.4 mm in the case of the gesso layer with no cracks (S/t is infinite) is marked on the Y scale. The applied strain εx was 0.01

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