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RISS 인기검색어
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- 저자 : Mahdi Gerdooei (검색결과 2 건)
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Mojtaba Dehghan,Fathallah Qods,Mahdi Gerdooei,Hamidreza Mohammadian‑Semnani 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.12
In this study, the cross accumulative roll-bonding (CARB) process, as an improved technique of the conventional accumulativeroll-bonding (ARB), was conducted on the AA1050 sheet up to 10 passes in two processing modes. The specimenswere either preheated before the rolling step of CARB passes and promptly roll bonded (warm CARB) or were processedat room temperature (cold CARB). The microstructure of samples was characterized using a scanning electron microscope. The effect of intermediate heat treatment on the planar homogeneity of the mechanical properties in the CARB (and evenARB) deformed sheets has not been examined yet. Hence, the present research focuses on the comparison of the planarisotropy of tensile properties between warm and cold CARB products. Also, the uniformity of microhardness distributionthroughout the thickness of samples was evaluated. The warm CARB presented higher elongation, lower tensile strength andmicrohardness with more uniformity of the microhardness distribution, and also premier planar isotropy of the mechanicalproperties than the cold CARB.
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Blast resistance of a ceramic-metal armour subjected to air explosion: A parametric study
Mohammad Javad Rezaei,Mahdi Gerdooei,Hasan Ghaforian Nosrati 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.74 No.6
Nowadays, composite plates are widely used as high-strength structures to fabricate a dynamic loading-resistant armours. In this study, the shock load is applied by an explosion of spherical TNT charge at a specified distance from the circular composite plate. The composite plate contains a two-layer ceramic-metal armour and a poly-methyl methacrylate (PMMA) target layer. The dynamic behavior of the composite armour has been investigated by measuring the transferred effective stress and maximum deflection into the target layer. For this purpose, the simulation of the blast loading upon the composite structure was performed by using the load-blast enhanced (LBE) procedure in Ls-Dyna software. The effect of main process parameters such as the thickness of layers, and scaled distance has been examined on the specific stiffness of the structure using response surface method. After validating the results by comparing with the experimental results, the optimal values for these parameters along with the regression equations for transferred effective stress and displacement to the target have been obtained. Finally, the optimal values of input parameters have been specified to achieve minimum transferred stress and displacement, simultaneously with reducing the weight of the structure.
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