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IDENTYFIKACJA SKŁADNIKÓW ENERGII ZMAGAZYNOWANEJ PODCZAS JEDNOOSIOWEGO ROZCIĄGANIA

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Podjęto próbę wyznaczenia energii zmagazynowanej na podstawie zależności naprężenie-odkształcenie. Przeprowadzona analiza teoretyczna pokazała, że w ten sposób można wyznaczyć jedynie dolną granicę energii zmagazynowanej. Na pod-stawie uproszczonego modelu materiału polikrystalicznego, podjęto próbę identyfikacji składników energii zmagazynowa-nej. Wykazano, że dolną granicę tej energii można trak[...]

COMPONENTS OF ENERGY STORAGE RATE DURING PLASTIC DEFORMATION AND THEIR IDENTIFICATION

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The subject of the present paper is decomposition of energy storage rate into terms related to different mode of deformation. The stored energy is the change in internal energy due to plastic deformation determined after specimen unloading. Hence, this energy describes the state of the cold-worked material. Whereas, the ratio of the stored energy increment to the appropriate increment of plastic work is the measure of energy conversion process. This ratio is called the energy storage rate. Experimental results show that the energy storage rate is dependent on plastic strain. This dependence is influenced by different microscopic deformation mechanisms. It has been shown that the energy storage rate can be presented as a sum of particular components. Each of them is related to the sep[...]

USE OF PULSE IR THERMOGRAPHY FOR DETECTION AND QUANTITATIVE DESCRIPTION OF SUBSURFACE DEFECTS IN AUSTENITIC STEEL

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Pulsed IR thermography is a non-destructive method that allows detection of subsurface defects in material. In this method the surface of the tested specimen is stimulated by heat pulse and its self-cooling process is analyzed. The temperature decrease rate is different for surface over defect with comparison to that over the sound material. It is caused by difference between values of heat diffusivity of defected zone and sound one. The purpose of this work is to determine the size and depth of the defects in austenitic steel on the basis of thermal contrast analysis. Because the thermal contrast is dependent on both these parameters, two independent experimental methods of defect size and depth determination were proposed. Keywords: pulsed thermography, thermal contrast, defect cha[...]

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