Abstract
Elastic modulus value is usually evaluated by employing a large tensile equipment with a standard round bar specimen. In order to measure the elastic moduli of materials in extreme low or high temperature conditions, the equipment needs an elaborate device and the device will become larger and expensive. A simple instrumentation system is developed to determine elastic moduli of various materials over wide range of temperatures by impact sound of a specimen which is suspended by thin string in a furnace or a refrigerator. The method needs a small rectangular specimen about 4x5x50. Suspending a specimen in an atmosphere filled with liquid nitrogen vapour or heated up by furnace, an impact to the specimen was brought about by a small sphere ball. Analyzing the sound emitted from the specimen by Fast Fourie Transform device and applying a relation between Young's modulus and a natural frequency, Young's modulus value on steel, cupper and aluminum were measured with ease over -190℃ near to melting point temperature of each material.
