Abstract
The mechanical response and the failure mode of thin metal foils under tensile load has been analyzed supplementing the usual test records with full-field measurements performed by three-dimensional digital image correlation (3D DIC) techniques. The experiments have been simulated by finite element models formulated within a non-linear continuum framework. The study presented in this contribution concerns symmetrically pre-cracked aluminum samples. The wrinkling of the specimens during the test and the possible and alternative failure mechanisms are evidenced and discussed.
Highlights
The present study is motivated by the spreading application of thin metal foils in different technological fields, for the production of flexible electronics, nano or micro-devices and beverages packaging [1,2,3]
This study focuses on the mechanical response of thin aluminum (Al) samples leaded to failure under uniaxial tensile load
[16] Mazzoleni, P., Matta, F., Zappa, E., Sutton, M.A., Cigada, A., Gaussian pre-filtering for uncertainty minimization in digital image correlation using numerically-designed speckle patterns, Optics and Lasers in Engineering, 66 (2015) 19–33
Summary
The present study is motivated by the spreading application of thin metal foils in different technological fields, for the production of flexible electronics, nano or micro-devices and beverages packaging [1,2,3]. The thinness of these laminates (few microns or less) makes them behave differently from the corresponding bulk materials. Determining the actual material properties and fracture characteristics of thin foils may be rather problematic since the samples are difficult to handle and sensitive to local imperfections, size and geometric effects In these conditions, even the interpretation of the output of uniaxial tensile tests may be difficult [7, 8]. The tests are simulated by two and three-dimensional numerical models of the experiment
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