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- W2597556070 abstract "Special requirements set for the constructional materials used in energy production have strongly influenced the challenges in the component design work. Many material parameters such as corrosion, fracture mechanics, fatigue and oxide films are needed as input data for such work. The generation of reliable data calls also for more sophisticated testing systems. The newly developed pneumatic loading technology (patented in Finland and international patents pending) provides important potential benefits and has already been successfully applied to testing many kinds of materials in different test environments. As the moving parts that penetrate the pressure boundary are not needed, the friction force at the sealing element location is avoided. Therefore the load control with pneumatic loading unit is more accurate than with the conventional servo-hydraulic devices. This enables testing of small size samples which is an advantage e.g. when testing irradiated materials or testing materials inside the reactor core of a nuclear power plant and especially in determining environmentally assisted crack growth rates of structural materials. Furthermore, the new design enables simultaneous testing of several samples, which helps produce more reliable statistical data in a more economical way. This thesis summarizes my work done at the Technical Research Centre of Finland over the past 9 years to increase the knowledge of factors affecting material testing devices and material properties in gas and aqueous coolants at high temperatures. The developed pneumatic servo-controlled material testing device has been used to perform crack growth rate tests as a function of stress intensity factor K for AISI 316 stainless steel and Inconel 182 weld metal in Boiling Water Reactor (BWR) coolant by using small size (10x10x55 mm) three point bending specimens. The load and displacement were controlled during these tests by the pneumatic servo-controlled fracture measuring device (PSCFM device) and based on test results crack growth rates for Inconel weld metal and AISI 316 have been calculated. During the tests, accuracy with very slow" @default.
- W2597556070 created "2017-04-07" @default.
- W2597556070 creator A5000190552 @default.
- W2597556070 date "2004-06-21" @default.
- W2597556070 modified "2023-09-24" @default.
- W2597556070 title "Pneumatic servo-controlled material testing device capable of operating at high temperature water and irradiation conditions: Dissertation" @default.
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