Papers by Author: Jerzy A. Szpunar

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Authors: Muhammad A. Arafin, Jerzy A. Szpunar
Abstract: A model for intergranular damage propagation in polycrystalline materials is proposed, based on Markov Chain theory, Monte Carlo simulation and percolation concept. The model takes into account crack branching and coalescence, multiple crack nucleation sites, crack-turning etc., as well as the effect of grain boundary plane orientations with respect to the external stress direction. Both honeycomb and voronoi microstructures were utilized as the input microstructures. The effect of multiple crack nucleation sites has been found to have great influence on the crack propagation length. It has been observed that percolation threshold reported in the literature based on hexagonal microstructure is not applicable when the effect of external stress direction on the susceptibilities of grain boundaries is considered. The successful integration of voronoi algorithm with the Markov Chain and Monte Carlo simulations has opened up the possibilities of evaluating the intergranular crack propagation behaviour in a realistic manner.
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Authors: Hua Long Li, Jong Tae Park, Jerzy A. Szpunar
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Authors: Hans Joachim Bunge, R. Grossterlinden, A. Haase, R. Ortega, Jerzy A. Szpunar, Paul van Houtte
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Authors: Yoshimasa Takayama, Jerzy A. Szpunar, Hajime Kato
Abstract: Intragranular misorientation reflects strain generated during deformation with dislocation glide. The SEM/EBSP (scanning electron microscope/ electron back scatter diffraction pattern) technique provides is “kernel average misorientation (KAM)” as the most appropriate quantity to evaluate the strain or the stored energy for a given point. The KAM is defined for a given point as the average misorientation of that point with all of its neighbors. In the present paper two analyses of the intragranular misorientation using the SEM/EBSP technique for a cyclic deformation at room temperature and a high temperature deformation in an Al-Mg-Mn alloy are reviewed.
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Authors: Bae Kyun Kim, Jerzy A. Szpunar, Alexandre P. Zhilyaev
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Authors: Jerzy A. Szpunar
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