2015 年 2015 巻 60 号 p. 15-22
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 Circular Ring Method) is developed for measuring Young’s modulus in a flexible material (thin plate, or wire), especially, a curved/curled material. The method is based on a nonlinear theory that takes into account large deformation behaviors of flexible materials. By means of measuring maximum horizontal displacement or maximun vertical displacement in flexible rings, Young’s modulus can be easily obtained for various thin materials (plate and wire). Measurements were carried out on a thin wire (piano wire). The results reveal that the new method is suitable for thin flexible materials. In the meantime, the new "Own- weight Circular Ring 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 multi-layered material formed by PVD, CVD, Electrodeposition, Coating, Paint, Cladding, Lamination, and others.
