XML
-
-
List of Articles
-
Open Access Article
1 - Hydroxyapatite Nano-Particles Extracted from Miscellaneous Bestial Resources: Study of Crystal Structure and Microstructure
Seyed Mehdi Rafiaei Mohammad Khodaei Fateme EslamiIn this work, hydroxyapatite nano-particles were successfully synthesized via the usage of available fish, hen and bovine bones in waste foods. The crystal structure, microstructure, and functional groups of the synthesized nanostructured bioceramics were studied using MoreIn this work, hydroxyapatite nano-particles were successfully synthesized via the usage of available fish, hen and bovine bones in waste foods. The crystal structure, microstructure, and functional groups of the synthesized nanostructured bioceramics were studied using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and fourier transform infrared spectroscopy (FTIR). It was shown that all the used natural resources provide well crystallized crystal structures of hydroxyapatite with a narrow distribution microstructure in the range of 24.4-93.4 nm. As well, it was found that the hydroxyapatite extracted from the fish bone has smaller particle size than those of the hen and bovine. Additionally, all the synthesized productions possess the same functional groups, they can be employed as promising candidates for the bone filler materials in biomedical engineering. Manuscript profile -
Open Access Article
2 - Novel BCP-Bioactive Glass-Akermanite/PCL Composite Scaffold: Physical and Mechanical Behavior, and in Vitro Bioactivity
Ebrahim karamian shakiba saghirzadeh darkiIn the present study, biphasic calcium phosphate (BCP)-bioactive glass-akermanite/PCL composite scaffold with high porosity (80%) was successfully fabricated using polymeric sponge replication and dip–coating methods. The composite was characterized via X-ray diff MoreIn the present study, biphasic calcium phosphate (BCP)-bioactive glass-akermanite/PCL composite scaffold with high porosity (80%) was successfully fabricated using polymeric sponge replication and dip–coating methods. The composite was characterized via X-ray diffraction (XRD) and scanning electron microscopy (SEM). In addition, physical and mechanical properties of the composite were evaluated using porosity and compressive strength measurements. In vitro bioactivity of the composite was carried out using simulated body fluid solution (SBF). Results showed that PCL, as a polymeric coating, incremented the mechanical strength of ceramic scaffolds from 0.97 to 1.9MPa, confirming its fundamental role in recovering the mechanical properties of scaffolds in bone tissue engineering. Bioactivity evaluation resulted in developing an apatite–like layer on the surface of the scaffolds, which verified the proper bioactivity of the scaffolds. The results showed that this novel composite scaffold has the potential to be applied as a temporary substrate for bone tissue engineering. Manuscript profile -
Open Access Article
3 - Editoral
-
Open Access Article
4 - Sintering of Glass - Steel Slag-SiC Composite as a Foam
aida faeghinia hossein mardi soosan hasheminiaFoam glass-ceramics are porous material with the desired strength. In this work, steel slag was mixed with soda lime glass in (20, 40, 50, 60, 70 wt. %,denoted by SG20,SG40,SG50,SG60,SG70) and 5 wt.% SiC. Giving to Hot stage microscopy images, glass-slag composite's con MoreFoam glass-ceramics are porous material with the desired strength. In this work, steel slag was mixed with soda lime glass in (20, 40, 50, 60, 70 wt. %,denoted by SG20,SG40,SG50,SG60,SG70) and 5 wt.% SiC. Giving to Hot stage microscopy images, glass-slag composite's contraction starts at 1050ºC. According to the SEM micrographs the tunnel-like pore porosity resulted from the decomposition of carbide phase were formed. The sizes of pors varies in 500 - 1000 μm range. More over by the 50 wt. % soda lime glass addition and sintering at 1200 ° C, the spherical porosity were formed and the size of the porosity were reduced to 50 μm in these composites. Also, by the the glassy phase increasing, the total porosity was increased to 80%, the density decreased to 0.8g / cm3in SG40. This composite as a porous material has 2 to 5 MPa bending strengths. Wollastonite phase was detected in these composite. Manuscript profile -
Open Access Article
5 - New Iteration based Algorithm for Shape Optimization of Internal and External Boundaries of the Initial Blank in the Deep Drawing Process
Hamidreza Gharehchahi Mohammad Javad Kazemzadeh-Parsi Ahmad Afsari Mehrdad MohammadiIn the deep drawing process, the optimal design of the initial blank shape has many advantages such as reducing the cost of production and waste and improving the quality of the process and thickness distribution. The deep drawing process is highly nonlinear due to the MoreIn the deep drawing process, the optimal design of the initial blank shape has many advantages such as reducing the cost of production and waste and improving the quality of the process and thickness distribution. The deep drawing process is highly nonlinear due to the large deformation, plastic deformation of the material and the contact phenomenon. Therefore, the general solution to such problems is to use iterative methods based on numerical simulation. The present study implements a similar approach and presents a new algorithm to make geometrical corrections to the external boundaries of a blank, as well as its internal boundaries, in several iterations. A computer program was developed to automatically run these iterations to study the features of the proposed algorithm. Next, an example problem was solved, and the results are compared with other studies. The results showed that the proposed algorithm is sufficiently robust against the initial guesses for the blank, which is an advantage of the present algorithm over those from other algorithms. Because in other algorithms presented in the articles, if the appropriate initial guess is not selected, the algorithm will not converge to the answer. The proposed algorithm also has a higher convergence speed in achieving optimal blank. Manuscript profile -
Open Access Article
6 - Creep and Stress Redistribution Analysis of Thick-Wall FGM Spheres Subjected to Mechanical Load and Heat Flux – An Analytical Approach
Ali Ziaei-Asl Mohammad Reza Saviz Javad PourabdollahIn this paper, creep analysis of a thick-walled spherical pressure vessel made of Functionally Graded Material (FGM) under thermo-mechanical loadings has been investigated based on Bailey-Norton Law. Considering the nonlinearity of the creep behavior, there is no analyt MoreIn this paper, creep analysis of a thick-walled spherical pressure vessel made of Functionally Graded Material (FGM) under thermo-mechanical loadings has been investigated based on Bailey-Norton Law. Considering the nonlinearity of the creep behavior, there is no analytical solution that can accurately determine the stresses of an FGM as a function of time and thermal boundaries, thus in this paper, a new method based on the Taylor Series expansion of the creep strain rate is developed to solve the Beltrami-Michell equation by employing an asymptotic method. The resulting quantities are compared with the numerical ones and show good accuracy. The impacts of FGM constants and wall-thickness, and series order on the creep stress and strain distributions are evaluated. The results are depicted graphically and reveal that even for vessels with high wall thickness and FGM constants, the proposed method equipped with high orders of the Taylor series produces accurate results. Also, due to the agreement of both numerical and analytical methods, this method can be generalized to study the creep of other symmetric FGM structures. Manuscript profile
-
The rights to this website are owned by the Raimag Press Management System.
Copyright © 2021-2024