Titlebook: Nonmetallic Materials and Composites at Low Temperatures; Günther Hartwig,David Evans Book 1986 Springer Science+Business Media New York 1

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Mechanical Properties of Three Candidate Organic Insulator Materials for Fusion Reactors, fast neutrons. One polyimide- and two epoxy-based laminates* were neutron irradiated to total doses of 2.6 and 4.1 × 10. n/m., E>0.1 MeV at 4.2 K in the Intense Pulsed Neutron Source at Argonne National Laboratory. Flexural properties were determined at 75 K and compared to results from previous st

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Craze Formation and Cryogenic Toughness,zes up to their break also mainly determine the fracture energy. Using the fracture mechanics approach together with the Dugdale type of plastic zone the single craze at a crack tip can be well characterized as may be seen from experimental investigations using the microscopic optical interference t

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A Simple Device for Short Time Cryogenic Tests and its Application in High Velocity Tensile Measure 4.2 K. On the basis of previous experience it is expected that brittleness increases with increasing deformation rate. Investigations. of the strain rate dependence on some selected polymers at 77 K showed that only up to a certain specific strain rate the fracture strain ε. decreases. At higher st

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Radiation Effects on Polybutyleneterephthalate Resins at Low Temperature,mbient temperature showed no appreciable change both in flexural strength and in flexural modulus. When the specimens were irradiated at 20 K and warmed up to 77 K after irradiation, only a slight mechanical change occurred in mica flake reinforced PBT, whereas remarkable reduction of flexural stren

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Optical Investigation of Pressure-Induced Matrix Changes in Polymers under Low Temeprature Conditioolecules embedded in polymer hosts to detect minute matrix changes resulting in optical changes of linewidths and line positions of as little as 10. ?. Using the dye molecule phthalocyanine in the polymer matrices polyethylene (PE) and polymethylmethacrylate (PMMA), it could be shown, that pressure

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Low Frequency Measurements on Polymethylmethacrylate,below 1 kHz using a vibrating reed technique. Below 6 K the polymer shows the acoustic properties known from inorganic glasses: a temperature independent plateau in the absorption and a logarithmic variation of the sound velocity with temperature. The results at low temperatures are discussed within

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Very Low Frequency Loss Measurements in Glasses,trinsic to the glassy state /1/. Recently measurements of the time dependence of the specific heat /2,3,4/ have shown that some of these excitations relax very slowly into thermal equilibrium. Such a behaviour, especially a logarithmic time dependence of the specific heat, is indeed predicted by the

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Mechanical Properties of Unidirectionally Reinforced Materials,iming at standardization of materials, testing methods and developing advanced materials. Mechanical properties on identical materials were measured at three different laboratories independently and the results were compared each other..The variation of mechanical properties originated from reinforc