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RISS 인기검색어
- 검색키워드
- 저자 : Faris Tarlochan (검색결과 5 건)
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Tarlochan, Faris,Mehboob, Hassan,Mehboob, Ali,Chang, Seung-Hwan Elsevier 2018 Composite structures Vol.204 No.-
<P><B>Abstract</B></P> <P>Traditionally, high stiffness hip prostheses are associated with aseptic loosening. Hence, the effects of stiffness, coating length, and interference press fit on load sharing and micro-movements are investigated for a better understanding from a mechanical perspective. A simplified 3D model of the femur and prostheses composed of cobalt chrome (CoCr), titanium (Ti), and glass/polypropylene (Twintex [0]<SUB>2nT</SUB>) composite are constructed. Three interference fits corresponding to 5, 25, and 50 µm are used with half, three-quarter, and full lengths of coating that are used to assemble the prostheses with bones to investigate micro-movements at the bone-prosthesis interfaces, interfacial failure, and stress transfer to the bone. The reaction forces of body weight and muscular forces in the femur are used to simulate the FE model. The results indicate that the CoCr and Ti prostheses exhibit low micro-movements at the proximal end and high micro-movements at the distal end and vice versa for the Twintex [0]<SUB>2nT</SUB> composite prosthesis. Uniformity of stress transfer to the bone along the prosthesis efficiently increases with increases in the coating lengths and interference press fits for all the cases. A fully coated length of Twintex [0]<SUB>2nT</SUB> composite prosthesis with a 50-µm interference press fit provides the most efficient load sharing and stress transfer to the bone and micro-movements at the bone–prosthesis interface.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Mehboob, Hassan,Tarlochan, Faris,Mehboob, Ali,Chang, Seung-Hwan Elsevier 2018 Materials & Design Vol.149 No.-
<P><B>Abstract</B></P> <P>Titanium porous cellular microstructures are commonly used in bone mimetic implants. The orientations of the internal strut architectures of these microstructures affect the mechanical performance under various loads; however, poor architectural designs may result in their failure. Three-dimensional (3D) finite element models of cubic, diamond, and body-centered cubic (BCC) geometries were constructed with 1<B>–</B>4 numbers of unit cells and 4–10-mm unit cell size. Mechanical testing of the finite models of the cubic, diamond, and BCC structures with porosities of 20–90% was performed under compression, bending, and torsional loads. The BCC structure showed moderate and relatively isotropic mechanical properties compared with those of the diamond and cubic structures. A design space for a BCC porous structure with a porosity of 40–65% was estimated to model a complete porous stem to mimic the bone properties. Furthermore, the stems with the determined porous mechanical properties of the BCC microstructures with 20–90% porosities were tested under physiological loading conditions. It was found that a porosity of 47.3% of the BCC structure exhibits the closest stiffness (469N/mm) to an intact bone (422N/mm). This was predicted by our suggested design space of the porosity.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Bioinspired 3D FE models of porous cellular structures with cubic, diamond, and body centered cubic geometries were constructed. </LI> <LI> Mathematical simplified relationship for porosity calculation was derived with less than 6% error between theoretical and CAD models. </LI> <LI> 20–90% porous cellular structures were tested under compression, bending and torsional loads. </LI> <LI> Gibson and Ashby and regression models were utilized to correlate the mechanical properties from FEA results. </LI> <LI> A design space of BCC porous structure with porosity of 40–65% was determined and 47.3% porous stem gave the similar stiffness to the bone. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Free vibration of FG-GPLRC conical panel on elastic foundation
Arameh Eyvazian,Farayi Musharavati,Faris Tarlochan,Abdolreza Pasharavesh,Dipen Kumar Rajak,Mohammed Bakr Husain,Tron Nhan Tran 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.75 No.1
Present research is aimed to investigate the free vibration behavior of functionally graded (FG) nanocomposite conical panel reinforced by graphene platelets (GPLs) on the elastic foundation. Winkler-Pasternak elastic foundation surrounds the mentioned shell. For each ply, graphaene platelets are randomly oriented and uniformly dispersed in an isotropic matrix. It is assumed that the Volume fraction of GPLs reainforcement could be different from layer to layer according to a functionally graded pattern. The effective elastic modulus of the conical panel is estimated according to the modified Halpin-Tsai rule in this manuscript. Cone is modeled based on the first order shear deformation theory (FSDT). Hamilton’s principle and generalized differential quadrature (GDQ) approach are also used to derive and discrete the equations of motion. Some evaluations are provided to compare the natural frequencies between current study and some experimental and theoretical investigations. After validation of the accuracy of the present formulation and method, natural frequencies and the corresponding mode shapes of FG-GPLRC conical panel are developed for different parameters such as boundary conditions, GPLs volume fraction, types of functionally graded and elastic foundation coefficients.
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Arameh Eyvazian,Abdel Magid Hamouda,Faris Tarlochan,Saeid Mohsenizadeh,Ali Ahmadi Dastjerdi 국제구조공학회 2019 Steel and Composite Structures, An International J Vol.33 No.6
This study considers the instability behavior of sandwich plates considering magnetorheological (MR) fluid core and piezoelectric reinforced facesheets. As facesheets at the top and bottom of structure have piezoelectric properties they are subjected to 3D electric field therefore they can be used as actuator and sensor, respectively and in order to control the vibration responses and loss factor of the structure a proportional-derivative (PD) controller is applied. Furthermore, Halpin-Tsai model is used to determine the material properties of facesheets which are reinforced by graphene platelets (GPLs). Moreover, because the core has magnetic property, it is exposed to magnetic field. In addition, Kelvin-Voigt theory is applied to calculate the structural damping of the piezoelectric layers. In order to consider environmental forces applied to structure, the visco-Pasternak model is assumed. In order to consider the mechanical behavior of structure, sinusoidal shear deformation theory (SSDT) is assumed and Hamilton's principle according to piezoelasticity theory is employed to calculate motion equations and these equations are solved based on differential cubature method (DCM) to obtain the vibration and modal loss factor of the structure subsequently. The effect of different factors such as GPLs distribution, dimensions of structure, electro-magnetic field, damping of structure, viscoelastic environment and boundary conditions of the structure on the vibration and loss factor of the system are considered. In order to indicate the accuracy of the obtained results, the results are validated with other published work. It is concluded from results that exposing magnetic field to the MR fluid core has positive effect on the behavior of the system.
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