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Flexural ductility of HSC members
Maghsoudi, A.A.,Bengar, H. Akbarzadeh Techno-Press 2006 Structural Engineering and Mechanics, An Int'l Jou Vol.24 No.2
In seismic areas, ductility is an important factor in design of high strength concrete (HSC) members under flexure. A number of twelve HSC beams with different percentage of ${\rho}$ & ${\rho}^{\prime}$ were cast and incrementally loaded under bending. The effect of ${\rho}^{\prime}$ on ductility of members were investigated both qualitatively and quantitatively. During the test, the strain on the concrete middle faces, on the tension and compression bars, and also the deflection at different points of the span length were measured up to failure. Based on the obtained results, the serviceability and ultimate behavior, and especially the ductility of the HSC members are more deeply reviewed. Also a comparison between theoretical and experimental results are reported here.
Theoretical Model for Evaluating the Threshold Reduction in Roll Bonding of Al/Al2O3/Al Laminations
M. Rezayat,A. Akbarzadeh 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.5
Roll bonding is the most important stage of the accumulative roll bonding process, which is used to produce high strength composites. The presence of a particle layer at the interface alters the bonding condition and increases the threshold reduction for the commencement of bonding. In this study, the bonding mechanism in presence of powder at the interface is analyzed and a theoretical model is proposed to predict the required threshold reduction in warm roll bonding of commercially pure aluminum sheets as a function of amount of alumina particles at the interface. The model considers the rolling parameters and the effect of amount and size of particles by defining some constants, which are obtained by experiment. It is shown that the measured values of the threshold reduction are very well predicted by the modeling results.