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Open Access Article
1 - Investigation of additive manufacturing of porous Ti-6Al-4V alloy: Geometry analysis for dental applications
Mohammad Hossein Malekipour Esfahani Fatemeh Safdarian Sharif HeydariThis research is dedicated to reviewing porous titanium alloy structures suitable for biomedical applications. The mechanical properties of porous samples with different structures and porosity were reviewed through a static compression test to identify the type of suit MoreThis research is dedicated to reviewing porous titanium alloy structures suitable for biomedical applications. The mechanical properties of porous samples with different structures and porosity were reviewed through a static compression test to identify the type of suitable structure. In addition, high porosity is desirable due to the growth of bone tissue in the internal microstructure of the porous bony implant. Samples are normally fabricated made of Ti-6Al-4V alloy and stainless steel using selective laser melting (SLM) as an additive manufacturing process. The samples were prepared with a pore size (200, 400, and 600 µm) and cubic and trabecular topology. The actual weight of all samples was determined, which is important in identifying other characteristics. All the tested samples reached the optimal values of maximum stress and tensile strength. The most appropriate mechanical properties were observed for samples with a pore diameter of 200 μm and a cubic structure. The implants with porosity, pore size, and pore interconnectivity affect the differentiation of bone tissue. Manuscript profile -
Open Access Article
2 - The influence of various boundary conditions on dynamic stability of a beam-moving mass system
Ramin Motiei Mostafa Pirmoradian Hossein KarimpourIn this paper, the effect of different boundary conditions on dynamic stability of a beam located on a viscoelastic medium stimulated by moving masses and periodic axial force is studied. Partial differential equations governing the system are derived using Hamilton's m MoreIn this paper, the effect of different boundary conditions on dynamic stability of a beam located on a viscoelastic medium stimulated by moving masses and periodic axial force is studied. Partial differential equations governing the system are derived using Hamilton's method and based on Euler-Bernoulli beam theory. Then, equations are converted into a set of ordinary differential equation with time-varying coefficients using Galerkin method along with trigonometric shape functions. The time-varying position of moving loads causes these time-varying coefficients in the governing equations. By applying Floquet's theory to the obtained equations, the conditions of parametric resonance are analyzed for different values of mass and velocity of passing loads. The results obtained from this research show that the stiffness and viscosity of the elastic medium have positive effects on the stability of the beam under moving and fluctuating axial loads. So, with a suitable choice for these values in practical applications, it is possible to prevent unexpected vibrations of the structure. In addition, the use of fixed supports for the two ends of the beam exposed to the mentioned loadings has high reliability in the discussion of dynamic stability. Manuscript profile -
Open Access Article
3 - The effect of explosive welding variables on corrosion behavior of 304 stainless steel–copper joint in 3.5% NaCl solution concentration environment
MohammadReza Khanzadeh Reza Peykari Hamid BakhtiariIn this study, the corrosion behavior and microstructural variations of two-layer sheets consisting of 304 stainless steel copper have been investigated after the explosive welding process. Explosive welding is carried out by variable explosive charges and changing the MoreIn this study, the corrosion behavior and microstructural variations of two-layer sheets consisting of 304 stainless steel copper have been investigated after the explosive welding process. Explosive welding is carried out by variable explosive charges and changing the distance between the sheets. To investigate the corrosion behavior of the welding zone, dynamic potential polarization and electrochemical impedance imaging were used. Besides, to perform microstructural analysis, metallographic tests using an optical microscope and scanning electron microscope (SEM) were employed. In addition, micro-hardness is considered to investigate the effect of shock waves caused by the explosion. The results showed that the sample with an explosive thickness of 79 mm has the highest interface hardness (HV 549) due to the high thickness of the explosive layer and standoff distance (3 mm). Also, the polarization test results indicated that the lowest corrosion rate corresponds to the sample with an explosive charge thickness of 79 mm and a standoff distance of 2 mm, and the highest corrosion rate was related to the sample with a 46-mm explosive charge thickness and standoff distance of 3 mm. Based on the results obtained from the electrochemical impedance spectroscopy, It can be concluded that by increasing the amount of copper in the locally frozen melt of the samples, the intensity of corrosion caused by the galvanic cell increases. Manuscript profile -
Open Access Article
4 - Dynamic analysis of guyed towers using direct time integration method by Newmark-β model
Kaveh Kumarci AliReza BaharizadehDirect time integration method is based on creating dynamic equation in selected time intervals. It is presented to solve equations of motion describing the dynamic response of the structural linear and nonlinear multi degree of freedom systems. In this research, dynami MoreDirect time integration method is based on creating dynamic equation in selected time intervals. It is presented to solve equations of motion describing the dynamic response of the structural linear and nonlinear multi degree of freedom systems. In this research, dynamic analyses of guyed cables with small sagging have been studied. Nonlinear systems in the guyed cables with multi degree of freedoms are involved creating matrix equation. In these systems, response and derivations of response- time have been found. Evaluation of the forced vibration response for nonlinear guy cable with multi degree of freedom needs to solve second order differential equations in the general coordination system. Therefore solving the equation may be obtained using integration methods of time domain. Newmark-β model is one of the direct time integration methods to solve second order differential equations of motion using the difference formulation. After normalization of motion equations for the second central difference, this model changes to explicit extrapolation to dynamic response. Because of having no domain loss error and has a small error in the periodicity, it can be used as one of the best formulation methods of guy cables under dynamic loads. Manuscript profile -
Open Access Article
5 - Investigating on process variables effect of AISI 304 stainless steel machining using minimum quantity lubricant on cutting force
Mohammad Ali Safataj Sayed Ehsan Mirmohammadsadeghi Reza AbedinzadehIn the machining process, the friction between the tool and the surface being machined, in addition to the destructive effects on tool wear and surface quality, increases the cutting force. By applying lubricant, it is possible to reduce the friction force in the machin MoreIn the machining process, the friction between the tool and the surface being machined, in addition to the destructive effects on tool wear and surface quality, increases the cutting force. By applying lubricant, it is possible to reduce the friction force in the machining process, and as a result, the cutting force is reduced. Due to the harmful environmental effects of excessive use of lubricants, the method of minimum quantity lubricant (MQL) can be helpful. In this method, fluid is applied with controlled flow and pressure. In this research, the effect of machining conditions on the cutting force for the machining process of AISI 304 stainless steel, using the method of minimum quantity lubricant has been investigated. The results show that with the increase in the cutting speed, the cutting force has decreased. Also, with the increase of injection pressure when applying the lubricating fluid using the method of the minimum quantity lubricant, a significant increase in the cutting force has been observed. Manuscript profile -
Open Access Article
6 - Numerical simulation of piston with different materials for justification of its strength
Bharosh Kumar Yadav Babin Dangal Shiva Shanker Pandey Mehdi JahangiriThis project deals with the determination of best material among the three selected ones. Initially, based on systematic literature review, three materials, i.e. aluminium 4032, grey cast iron and titanium 6Al-6V, were selected, and their properties were determined. The MoreThis project deals with the determination of best material among the three selected ones. Initially, based on systematic literature review, three materials, i.e. aluminium 4032, grey cast iron and titanium 6Al-6V, were selected, and their properties were determined. Then, design specifications form YAMAHA FZV3 was taken, and required design parameters and necessary dimensions of the piston were calculated. After this, the piston's Design was performed using SOLIDWORKS 2016, followed by structural and thermal analysis using ANSYS 16.0. Finally, the results were compared and it was noticed that among three materials the highest deformation was seen for aluminum which was 31.77% more than titanium alloy while the maximum difference in stress was for grey cast iron with 39.7% more than titanium alloy. Also, the heat flux for titanium alloy was least. This indicated that titanium 6Ai-4V gave better for durability and structural and theoretical performance. Hence, it was concluded to be the best material among the selected ones for the piston used. Manuscript profile
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