Abstract
An experimental method for a single layer is extended to determine the elastic properties of nanostructured W/Cu multilayers on a flexible substrate. The strain difference between the W/Cu-polyimide-W/Cu composite and the uncoated substrate, measured by dual digital image correlation, allows us to extract the effective Young’s modulus of W/Cu multilayers (20 periods) equaling $$216 \pm 13\hbox { GPa}$$. Finite element method is then performed, which agrees well with the experiment and classical rule of mixture (ROM) theory demonstrating that the extension to multilayers is effective and reliable. The numerical analysis also interestingly shows that the strain difference is linearly related to the thickness ratio (W/Cu), periods and sublayer thickness, respectively. In contrast to ROM theory, this approach could potentially be used for the evaluation of properties and design of emerging/unknown functional multilayers, whether or not they are crystalline or amorphous.
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