Using Ultrasonic Testing Temperature Stress Of Seamless Rail Program

This paper presents the method based on acoustoelasticity theory to test longitudinal temperature stresses in the continuously welded rails and design of the intelligent stress measure instrument with the ultrasonic. Rails are the important part of railroad. While rails temperature alone with environment temperature, the longitudinal forces may be created in the rails. Oversize stresses will cause the rail bent or ruptured, which seriously influence the safety of railroad. In resent years, many measurement methods and measure instruments were developed to test longitudinal thermal stresses of continuously welded rails. However, simple, universal and effective instruments or methods don't appear up to now. This paper present a measurement method based on acoustoelasticity theory and the general study of displacement sensor, interface circuit and software arithmetic. 1. The paper presents a theoretic deduce to the stresses measurement based on acoustoelasticity theory, and worked out the mathematic formulas of the measurement. 2. The design of measure instrument sufficiently applied the technology of new type ultrasonic signal convert circuit and micro controller, which can improve the function and capability of the instrument. 3. Designed perfect intelligent software for measure system. The software actualized auto-adjust, auto-plus control and temperature expiate, and so on, which father improves the measure precision. The development of this new type instrument of temperature stresses fulfilled fast and precise measurement. The instrument has the characteristics of simple, low cost, credible and fast responds, which make the instrument having applied value.