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Flexible materials are widely used for mechanical springs. It is very important to evaluate mechanical properties of these materials, for example, Young’s modulus. Although a conventional threeor four-point test, or cantilever test is convenient to get Young’s modulus, it has several disadvantages, especially for flexible materials. Taking into account large deformation behaviors of flexible materials, this report deals with a new measuring method (Tensile Circular Ring Method) to investigate Young’s modulus. A newly proposed method is based on a large deformation of a ring specimen subjected to tensile forces. A modulus measured by using this method is ‘secant modulus’. A measuring test was performed on two kinds of flexible materials (a steel material and a high-polymer material) in order to assess the applicability of the method. Consequently, it is made clear that the new method is suitable for flexible thin plates/thin rods.

A New Measuring Method of Young's Modulus for Flexible Materials using Three Point Bending Test