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Full-Text Articles in Mechanical Engineering
Influence Of Friction Stir Welding On The Microstructural Evolution, Mechanical Properties And Superplastic Behavior Of Al-Cu-Li Alloy (Aa 2095), Moataz Attallah
Influence Of Friction Stir Welding On The Microstructural Evolution, Mechanical Properties And Superplastic Behavior Of Al-Cu-Li Alloy (Aa 2095), Moataz Attallah
Archived Theses and Dissertations
Friction Stir Welding (FSW) is a new solid state welding technique which is characterized by its ability to join the difficult-to-weld alloys, notably aluminum alloys. Microstructural studies revealed that FSW produces fine grain structure within the weld nugget due to the extensive plastic deformation and dynamic recrystallization (DRX) associated with it. Further studies hypothetically suggested that thermo-mechanical processing using friction stir can be used as a technique to create ultra-fine grain structure for superplastic forming (SPF). Yet, a more practical and economic suggestion indicated the suitability of combining FSW with SPF technologies in a way similar to the existing combination …
Agile Manufacturing System Scheduling Using Genetic Algorithms And Simulated Annealing, Sherif Masoud
Agile Manufacturing System Scheduling Using Genetic Algorithms And Simulated Annealing, Sherif Masoud
Archived Theses and Dissertations
Agile manufacturing is concerned with thriving in prevailing market conditions by quickly introducing new or modified products. This research deals with the scheduling of an agile manufacturing system (AMS), which performs both machining and assembly, with the objective of minimizing the makespan. The AMS allows the production of high varieties of modular products in small batches and at low costs. This problem is difficult to solve optimally and was solved in literature by heuristic algorithms. In the current research, four novel, genetic algorithms and simulated annealing-based, heuristics – General Genetic Algorithm, General Simulated Annealing, Heuristic Assisted Genetic Algorithm, and Heuristic …
Analysis Of The Cup Drawing Process And Optimization Of The Blank Holder Force, Hossam Gharib
Analysis Of The Cup Drawing Process And Optimization Of The Blank Holder Force, Hossam Gharib
Archived Theses and Dissertations
The process of deep drawing of a cylindrical cup is analyzed and optimized for the minimum punch force. An analytical model is developed for the cup drawing process by determining the variation of stresses and strains over the deforming sheet at any stage of deformation until a full cup is formed. The model uses finite difference approach and numerical analysis to solve for equilibrium, continuity, and plasticity equations. Then, optimization of the blank holder force (BHF) is carried out using the developed analytical model. Optimization is carried out using genetic algorithms to determine the optimum linear BHF scheme that minimizes …