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Wrinkle patterns for a 0.025 mm thick Kapton film under shear displacements (from experiment)

Imposed shear displacements of: (a) δ = 0.5 mm, (b) δ = 1.0 mm, (c) δ = 2.0 mm, and (d) δ = 3.0 mm

From: Y. Wesley Wong and Sergio Pellegrino, "Wrinkled Membranes, Part I: Experiments", Journal of Mechanics of Materials and Structures, Vol. 1, No. 1, 2006

ABSTRACT: This paper presents a detailed experimental study of the evolution and shape of reversible corrugations, or wrinkles, in initially flat, linear-elastic and isotropic thin foils subject to in-plane loads. Two sets of experiments were carried out, on a rectangular membrane under simple shear and on a square membrane subjected to two pairs of equal and opposite diagonal forces at the corners. Salient findings are that: the wrinkle profile is generally well approximated by a half sine wave in the longitudinal direction, with constant or linearly-varying transverse wavelength; sudden changes in the shape of the membrane, accompanied by changes in the number of wrinkles, occur in both cases; in the sheared membrane the wrinkle pattern remains essentially unchanged for increasing shear displacement, whereas in the square membrane a large diagonal wrinkle appears when the corner load ratio is around 3.

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