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Evaluation of Deformation and Formability Behaviors of the Ferritic-Pearlitic Steel Sheets by Employing the Experimental Approaches and Micromechanical Modeling
, Ph.D. Dissertation Sharif University of Technology ; Assempour, Ahmad (Supervisor)
Abstract
A broad range of plain carbon steels have ferrite-pearlite microstructures, which are used in many industrial applications due to the good strength and formability provided by the typical combination of ferrite grains and pearlite colonies. The mechanical behavior of ferrite-pearlite steels inherently originates from the configurations of ferrite grains and pearlite colonies, which comprised alternating lamellae of cementite with randomly distributed orientations in a ferrite matrix. In this thesis, three different experimental-numerical approaches were employed to investigate the deformation behavior, damage mechanisms, and formability of the ferrite-pearlite steels. At the first step, two...
Experimental and Analytical Investigation of Air-Entrained Slag-Based Geopolymer Concrete under Freeze-Thaw Conditions
, M.Sc. Thesis Sharif University of Technology ; Toufigh, Vahab (Supervisor)
Abstract
In cold climates, structures are exposed to low temperatures during winter, which is one of the primary factors contributing to the deterioration of mortar and concrete. The destructive effect of freeze-thaw cycles on concrete is the main cause of concrete failure in cold regions. Frost damage in concrete is a complex physical phenomenon that begins with the internal microstructure of concrete. This damage occurs when water fills the voids of porous material and then freezes and expands. A prerequisite for improving the resistance to frost and extending the useful life of concrete is understanding the damage mechanism and the performance evolution model in a thawing and freezing environment....