Abstract
The mechanical properties, wrinkling phenomenon and fatigue response of polymeric polyethylene rectangular thin films due to both static tensile and cyclic tests were investigated. From the tensile tests we obtained the stress-strain curves and observed the formation of wrinkles for original films. The evolution of wrinkles resulted from in-plane to out-of-plane deformation and deflection. Also, the tensile tests for notched films were performed such as with a central hole, two vertical holes and two horizontal holes. From the fatigue tests the total strain vs. life curve was achieved. It was composed of two straight lines of both elastic and plastic parts.
Highlights
Membranes, thin sheets, thin films and their structures subjected to longitudinal bending are unstably buckled under compressive stress
The photos scitation.org/journal/adv of wrinkles at points n = 1, . . ., 10 corresponding to the load vs. displacement curves were shown in Figure 6(a) for a central hole and Figure 6(b)–6(c) for two vertical holes and two horizontal holes in the center in PE thin films, respectively
As for the notched thin films we found an interesting phenomenon in Table III, it was that for the first wrinkle number the applied load of two vertical holes was larger than that of a central hole
Summary
Thin sheets, thin films and their structures subjected to longitudinal bending are unstably buckled under compressive stress. Less instructive buckling occurs in an elastic thin film due to considerable in-plane stretching.. Less instructive buckling occurs in an elastic thin film due to considerable in-plane stretching.1,2 They are widely used in related industries, especially in space applications. It includes salar sails, radars, solar energy systems and large area flexible electronics as they possess the advantages of light weight, low space requirement, and surface flatness in flexible thin structures. In the space applications a solar sail for instance, the surface wrinkles will result in uneven loading, momentum loss and torques on space crafts. It is attributed to the Poisson’s effect the induced transverse compression results in the structures of very low modulus to buckle and form the wrinkles. To understand the mechanics of wrinkles and to control the surface wrinkles are important issues
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