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The Influence of Cooling Rate on Structure of EN AC 5083 Aluminum Alloy

Abstract

In this paper it was studied the structure of EN AC 5083 aluminum alloy depending on cooling conditions. By cooling curves recorded for different casting conditions there were calculated the cooling rate (vr). The structural analyzes, performed by Image Pro-Plus 6.0 software, allowed both be highlighted structural particularities of various conditions for casting and establishing the correlation: lg d = lg v + n (where d is the dendritic parameter).

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Porous Metallic Biomaterials Processing (Review) Part 1: Compaction, Sintering Behavior, Properties and Medical Applications

Abstract

Over the last few decades, researchers has been focused on the study of processing using different methods of new biocompatible and/or biodegradable materials such as permanent or temporary medical implants in reconstructive surgery. The advantages of obtaining biomedical implants by Powder Metallurgy (P/M) techniques are (i) obtaining the near-net-shaped with complex forms, (ii) making materials with controlled porosity or (iii) making mechanically resistant sintered metallic materials used as reinforcing elements for ceramic/polymeric biocompatible materials. In this first part of the 2-part review, the most used and newest metallic biomaterials obtained by P/M methods are presented, along with their compaction and sintering behavior and the properties of the porous biomaterials studied in correlation with the biomedical domain of application.

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Study on Influence of Microstructure and Thermal Treatment on Magnetic Losses from Non-Oriented Silicon Electrical Steel

-alloying elements on physical and structural characteristics of the some steel destined for manufacturing the oil pipes. Romanian Reports in Physics. Vol. 68. No. 1. P. 278–293. 2016. ISSN: 1221-1451; eISSN: 1841-8759. [19] F.V.Anghelina. Correlation Between Primary Recrystallization Texture And Goss Texture For The Electrotechnical Steel. Magazine JOSA-Journal of Science and Arts. Nr. 1 /2014. ISSN 1844-9581. Ed. Bibliotheca.Targoviste. [20] C. O. Rusănescu. M. Rusănescu - The influence of the residual copper on the pipes steel hot plasticity according to

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Theoretical Investigation on Growth Kinetics and Thermodynamic Properties of Pyridine-2-Carboxylic Acid Crystals

concentration of the solute was analyzed gravimetrically. The experiment was repeated at different temperatures. 3.2 Computational Methods GAUSSIAN 09 quantum chemical software [ 8 ] was used for all the calculations. The molecular structure of pyridine- 2-carboxylic acid was optimized by Berny’s optimization algorithm using redundant internal co-ordinates at the DFT level, using the closed-shell Becke–Lee–Yang–Parr hybrid exchange-correlation three-parameter functional (B3LYP) in combination with 6-31G(d,p) basis set to derive the complete geometry optimizations and

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Optimization of the Process Parameters of Resistance Spot Welding of AISI 316l Sheets Using Taguchi Method

nonlinear multiple regression analysis and artificial neural network (ANN) approach for predicting the nugget diameter and tensile shear strength of galvanized steel. According to the prediction model, the predicted systems of welding process parameters were formulated in order to obtain the desired welding quality. Esme [ 5 ] used the Taguchi method to investigate the optimization and effect of welding parameters on the tensile shear strength of spot welded SAE 1010 steel sheet. Correlations between the microstructure and the hardness in weld joints, and the

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Experimental Investigation of a Centrifugal Pump Hydraulic Performance in Hydraulic Transmission of Solids

, however, is increasingly suppressed as solid concentration increases at N js [ 16 ]. The hydraulic conveying of solid–liquid concentrated suspensions in pipelines corresponds to complex flows where particles with different sizes, concentrations, and flow velocities exhibit different flow regimes. Recently, researchers have conducted some works on sewage sludge for pumping design [ 17 , 18 , 19 , 20 ]. The Gidaspow-Schiller-Neumann drag correlation was more adequate for low flow velocities and with intermediate particle concentrations. With this work, it is shown

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Turning operation of AISI 4340 steel in flooded, near-dry and dry conditions: a comparative study on tool-work interface temperature

}\\ \displaystyle +0.69f^{2}+0.02d^{2} \end{array}$$ (3) For the above mathematical equations, it was found that the values of r 2 were 0.98, 0.97 and 0.98 for flooded, near-dry and dry machining conditions respectively, where ‘r’ is the correlation coefficient and the value range of ‘r 2 ’ should be between 0.8 and 1 [ 26 ]. The value of ‘r 2 ’ indicates the closeness of the mathematical equations representing the output response. 5.4 Scanning Electron Microscopy analysis Figure 12 illustrates the scanning electron microscopy results of the worn nose and flank face

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Experimental Investigation of Drilling Small Hole on Duplex Stainless Steel (SS 2205) Using EDM

ANOVA for MRR, and regression equation is given in Eq. (1) . Table 4 ANOVA table for metal removal rate Source Sum of squares df Mean square F -value p -value Prob > F Model 5,057.992 3 1,685.997 6.604782 0.0343 Current 2,691.554 1 2,691.554 10.54398 0.0228 Spark gap 122.5295 1 122.5295 0.480001 0.5193 Dielectric pressure 2,243.909 1 2,243.909 8.790364 0.0313 Residual 1,276.346 5 255.2692 Correlation total 6,334.337 8 From Table 4

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Experimental and Numerical Study of Bead Welding Behavior of HDPE Pipe Under Uniaxial Loading

base material BM subjected to the tensile loads ( V e = 10 and 50 mm/min) shows a good correlation between the numerical model (viscoelastic–viscoplastic) and the experimental results obtained. It is thus concluded that the model used is applicable for HDPE. The results of the tensile tests carried out at different stress speeds (welded material) were also compared. It is summarized that the drawing speed of the welded specimens caused an increase in the elastic limit and reduced the breaking strength. Unwelded specimens indicate a higher yield strength than

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Finite element model updating using Lagrange interpolation

1 Introduction Finite element model updating is a technique that improves the correlation between the measured data and the theoretical prediction. A significant number of methods exist. These methods can be classified into two categories, namely direct methods and iterative methods. Direct methods are also called basic reference methods, and they reproduce the experimental measurement so that it can be used later; these methods do not localize the modelling errors. Iterative methods are also called parametric identification by updating; these methods are

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