In recent years, flexible materials with very high performance are widely used and large deformation analyses of these materials have attracted considerable attention. Therefore, it is very important to evaluate mechanical properties, especially, Young's modulus, of these flexible materials. In this study, a new and convenient mechanical testing method (Compression Column Method) is developed for measuring Young's modulus of each layer in a thin flexible multi-layered material (thin plate, rod, or wire). The method is based on a nonlinear theory under the assumptions of the geometrical nonlinearity that takes into account large deformation behavior of multi-layered materials. Exact analytical solutions for large deformation are obtained in terms of elliptic integrals. By means of measuring the horizontal displacement at the fixed end or the vertical displacement at the middle point of the buckled column, Young's modulus of each layer can be easily obtained for various thin and long multi-layered materials. Measurements were carried out on a two-layered material consisting of PVC (a high-polymer material) and SUS (a stainless steel material). As a result, it is made clear that the new method is suitable for thin flexible multi-layered materials. In the meantime, the new method proposed in this paper can be applied widely to measure Young's modulus of ever y thin layers formed by PVD, CVD, Electrodeposition, Coating, Paint, Cladding, Lamination, and others.
In application of flexible thin materials, it is very important to evaluate mechanical properties of these materials in both analytical and technological interests. In this study, a new and convenient mechanical testing method (Own-Weight Cantilever Method) is provided for measuring Young's modulus in flexible materials (thin plate, or wire). The method is based on a nonlinear theory that takes into account the large deformation behavior of flexible materials. By means of measuring horizontal or vertical displacement at the free end of a cantilever, Young's modulus can be easily obtained for various thin plate or wire materials. In this study, measurements were carried out on a thin piano wire. The result reveals that the new method is suitable for thin flexible materials. In the meantime, the new " Own-Weight Cantilever Method" proposed in this paper is quite a promising method and can be extended to measure Young's modulus of every thin layer in a flexible multilayered material formed by PVD, CVD, Electrodeposition, Coating, Paint, Cladding, Lamination, and others.
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