Problem statement:The objective of this study was to study the Indirect Resistance Electrical Furnaces (IREF) based on analytical and experimental analyses. The analytical analysis focused on a constant set of equations representing the internal and external flow of heat energy in the furnace, which demonstrated, relatively with the surface area of walls, heat transferring inside the furnace chamber to get a creation mathematical model including the joining between the temperature required design components (furnace walls, thickness and electrical power supply).Approach:The experimental analysis has divided in to tow parts; first part based on process number of practice experiments with three prototypes have manufactured in certain engineering dimensions that changed in three different volumes of furnace, which are considered, i.e., chamber volume of furnace is the design dimensions component.Results:The second part of analytical analysis based on use the Simulink program (MATLAB 7.4) compared with experimental results of the manufactured furnaces samples, which showed the direct effect of the design dimensions components on the performance specifications of furnace that involve the required temperature response, temperature stability and the deviation in the setting value of temperature.Conclusion:Although information relating to the design and fabrication of an indirect resistance electrical furnaces of such prototypes as that fabricated through this research was not readily available in the literature.
This paper investigates the applicability of the proposed digital image correlation (DIC) system instead of traditional method by microscope to measure the strains in forward extrusion process, which conducted for rectangular section with plane strain condition by using taper die at angle (2 =90 ) and the proportion of reduction in area is (42.85 %). Commercial pure lead (99.99% Pb) was chosen as a typical pattern to measure the strain and strain rate for the forward extrusion process by a visio-plasticity technique and the proposed digital image correlation system. The obtained results indicate that the proposed digital image correlation (DIC) system is an accurate and reliable for measuring the strains using inexpensive equipments.
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