DIAGNOSTIC METHOD OF PHYSICAL PROPERTY OF RESIN MOLDED BODY

• Main Authors: KANEZASHI YASUHISA, EJIRI TOSHIO, ICHIKAWA ICHIROU
• Format: Patent
• Language: English
• Published: 01.11.1996
• Edition: 6
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

PURPOSE: To obtain a diagnostic method in which the physical property of the matrix of a synthetic resin molded body can be diagnosed nondestructively and simply by a method wherein the synthetic resin molded body is irradiated with ultrasonic waves and the height of reflected waves from a prescribed face is measured. CONSTITUTION: The height of reflected waves from the bottom face of ultrasonic waves applied to a synthetic resin molded body such as an epoxy resin displays a correlation between the modulus of elasticity of a resin constituting the molded body and a glass transition temperature. Then, the synthetic resin molded body is irradiated with ultrasonic waves at a prescribed frequency, the height of reflected waves from a prescribed face is measured, and the physical property of the molded body is diagnosed from its measured value. For example, an ultrasonic test is made by irradiating a sample with ultrasonic waves in which the mixing ratio of hardening agents is changed and whose modulus of elasticity is changed and that a bottom-face echo height is measured. Then, the echo height, decibel value, modulus of elasticity and the glass transition temperature have a correlation. Consequently, their relationship is put in order with reference to the decibel value so as to find a working curve, and the physical property can be diagnosed correlating the height of the measured ultrasonic echo with the working curve.