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RISS 인기검색어
- 검색키워드
- 저자 : Mostafa Shazly (검색결과 4 건)
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Effect of process control mode on weld quality of friction stir welded plates
Mostafa Shazly,Sherif Sorour,Ahmed R. Alian 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.1
Friction stir welding (FSW) is a solid state welding process which requires no filler material where the heat input is generated by frictionalenergy between the tool and workpiece. The objective of the present work is to conduct a fully coupled thermomechanical finiteelement analysis based on Arbitrary Lagrangian Eulerian (ALE) formulation for both “Force-Controlled” and “Displacement-Controlled”FSW process to provide more detailed insight of their effect on the resulting joint quality. The developed finite element models use Johnson-Cook material model and temperature dependent physical properties for the welded plates. Efforts on proper modeling of the underlyingprocess physics are done focusing on the heat generation of the tool/workpiece interface to overcome the shortcomings of previousinvestigations. Finite elements results show that “Force-Controlled” FSW process provides better joint quality especially at higher travelingspeed of the tool which comes to an agreement with published experimental results.
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Ductile damage prediction of AA 5754 sheet during cold forming condition
Mohamed Amer,Mostafa Shazly,Mohamed Mohamed,Abdel Aziz Hegazy 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.10
Aluminium sheet parts manufactured by cold-forming processes are subjected to ductile damage due to the plastic deformation. Tool design based on the experience and failure prediction using simple criteria in sheet metal forming can cause high cost of material scrap and tools modifications. Consequently, the ability to predict ductile damage gives full control of the forming process. This work was conducted to evaluate the predictive capability of different damage models for AA 5754 under cold forming condition. The models are calibrated using published tensile and forming limit diagram data for AA 5754. A set of experimental cup tests for AA 5754 sheet were conducted to validate the selected models. An FE model was developed to simulate the cup test process using LS-DYNA software. The selected models used were the Johnson-Cook, continuum damage model (CDM), Gurson model and the generalized incremental stress state-dependent model (GISSMO) model. The experimental results of the cup tests were compared with the simulation results from different damage models concluding that the Gissmo model was able to show a good agreement with the experimental results.
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Abdelaziz, Ashraf Omar,Elbaz, Tamer Mahmoud,Shousha, Hend Ibrahim,Ibrahim, Mostafa Mohamed,El-Shazli, Mostafa Abdel Rahman,Abdelmaksoud, Ahmed Hosni,Aziz, Omar Abdel,Zaki, Hisham Atef,Elattar, Inas An Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.9
Background: Hepatocellular carcinoma (HCC) is a dismal tumor with a high incidence, prevalence and poor prognosis and survival. Management of HCC necessitates multidisciplinary clinics due to the wide heterogeneity in its presentation, different therapeutic options, variable biologic behavior and background presence of chronic liver disease. We studied the different prognostic factors that affected survival of our patients to improve future HCC management and patient survival. Materials and Methods: This study is performed in a specialized multidisciplinary clinic for HCC in Kasr El Eini Hospital, Cairo University, Egypt. We retrospectively analyzed the different patient and tumor characteristics and the primary mode of management applied to our patients. Further analysis was performed using univariate and multivariate statistics. Results: During the period February 2009 till February 2013, 290 HCC patients presented to our multidisciplinary clinic. They were predominantly males and the mean age was $56.5{\pm}7.7years$. All cases developed HCC on top of cirrhosis that was mainly due to HCV (71%). Most of our patients were Child-Pugh A (50%) or B (36.9%) and commonly presented with small single lesions. Transarterial chemoembolization was the most common line of treatment used (32.4%). The overall survival was 79.9% at 6 months, 54.5% at 1 year and 22.4% at 2 years. Serum bilirubin, site of the tumor and type of treatment were the significant independent prognostic factors for survival. Conclusions: Our main prognostic variables are the bilirubin level, the bilobar hepatic affection and the application of specific treatment (either curative or palliative). Multidisciplinary clinics enhance better HCC management.
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Bassem Dahshan,Abdel-Halim M. El-Habbak,Mahmoud A. Adly,Mostafa Shazly 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.8
Fiber metal laminates (FMLs) are a special type of composite structure consisting of metal sheets bonded to composite laminas. The current study investigated the effect of the replacement of cross-ply (0/90 ◦ ) glass fiber reinforced epoxy laminas with woven glass fiber reinforced polyester laminas in GLARE laminates on the tensile, bending and interlaminar fracture toughness of the laminate. Test results showed that the existence of woven glass fiber laminas increased the tensile strength with a decrease in corresponding strain, the flexure strength decreased significantly due to the existence of polyester instead of epoxy resin, and the mode I interlaminar fracture toughness increased. ABAQUS® software was used to simulate the tests, and ductile damage was employed to detect the failure of aluminum layers, the Hashin failure criteria to model the failure of composite layers in the laminate, and the cohesive surface interaction to capture delamination between layers.
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