Issue 48

Y. Sun et alii, Frattura ed Integrità Strutturale, 48 (2019) 648-665; DOI: 10.3221/IGF-ESIS.48.62

the formation of the crack on the local stress of the film, they presented some mathematical models to analyze the evolution of the radial stress  rr and the hoop stress   before and after the crack formation, as described in Eqns. (4) and (5):

Figure 5 : Morphology transition from circular crack with radial wrinkles under out-of-plane indentation to radial cracks with circumferential wrinkles under in-plane displacement, modified from ref. [7].

Figure 6 : Evolution profiles (a) and (b) of the radial stress  rr   (solid curves) with r a at indentation depths  =18μm (corresponding to Fig. 5(a)) and  =20μm (corresponding to Fig. 5(b)). Modified from ref. [7]. (dashed curves) and the hoop stress

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