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RISS 인기검색어
- 검색키워드
- 저자 : Gholamhassan Payganeh (검색결과 4 건)
- 무료
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Ali Sadooghi,Gholamhassan Payganeh,Mehdi Tajdari,Amir H. Roohi 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.5
The majority of the product failure in industries is due to fatigue loadings. On the other hand, Nanocomposite materials area new group of materials, which are developed because of their enhanced mechanical properties. In this manuscript, metalmatrix nanocomposite samples (i.e. steel alloy 316L is considered as the matrix together with TiC and hBN nanoparticlesas the reinforcing particles) are produced using the powder metallurgy process. The reinforcing nanoparticles in 3.5 wt% foreach one are added to the matrix material. The samples are compacted in the pressure of 410 MPa and sintered in temperatureof 1375 °C for 3.5 h. Tensile testing is carried out on the samples to find the mechanical properties of the material andto compare with the corresponding properties of the pure steel. High-cycle fatigue tests are performed to derive the Stress-Cycle curve of the nanocomposite material. Subsequently, estimation of the fatigue life of nanocomposite gear is done, usingfinite element numerical simulations, and then the results are compared with the AGMA standard results. Experimental andnumerical results show improved mechanical properties of nanocomposite samples, compared to steel, as a result of theexistence of reinforcement nanoparticles.
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Gholamreza Asgari,Gholamhassan Payganeh,Keramat Malekzadeh Fard 국제구조공학회 2019 Structural Engineering and Mechanics, An Int'l Jou Vol.72 No.4
The purpose of the present work was to study the dynamic instability of a three-layered, symmetric sandwich beam subjected to a periodic axial load resting on nonlinear elastic foundation. A higher-order theory was used for analysis of sandwich beams with soft core on elastic foundations. In the higher-order theory, the Reddy's third-order theory was used for the face sheets and quadratic and cubic functions were assumed for transverse and in-plane displacements of the core, respectively. The elastic foundation was modeled as nonlinear’s type. The dynamic instability regions and free vibration were investigated for simply supported conditions by Bolotin’s method. The results showed that the responses of the dynamic instability of the system were influenced by the excitation frequency, the coefficients of foundation, the core thickness, the dynamic and static load factor. Comparison of the present results with the published results in the literature for the special case confirmed the accuracy of the proposed theory.
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Flutter phenomenon in composite sandwich beams with flexible core under follower force
Fahimeh Rashed Saghavaz,GHolamhassan Payganeh,Keramat Malekzadeh Fard 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.39 No.5
The main purpose of the present work was to study the dynamic instability of a three-layered, thick composite sandwich beam with the functionally graded (FG) flexible core subjected to an axial compressive follower force. Flutter instability of a sandwich cantilever beam was analyzed using the high-order theory of sandwich beams, for the first time. The governing equations in general for sandwich beams with an FG core were extracted and could be used for all types of sandwich beams with any types of face sheets and cores. A polynomial function is considered for the vertical distribution of the displacement field in the core layer along the thickness, based on the results of the first Frosting’s higher order model. The governing partial differential equations and the equations of boundary conditions of the dynamic system are derived using Hamilton's principle. By applying the boundary conditions and numerical solution methods of squares quadrature, the beam flutter phenomenon is studied. In addition, the effects of different geometrical and material parameters on the flutter threshold were investigated. The results showed that the responses of the dynamic instability of the system were influenced by the follower force, the coefficients of FGs and the geometrical parameters like the core thickness. Comparison of the present results with the published results in the literature for the special case confirmed the accuracy of the proposed theory. The results showed that the follower force of the flutter phenomenon threshold for long beams tends to the corresponding results in the Timoshenko beam.
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Rasool Moradi-Dastjerdi,Gholamhassan Payganeh 국제구조공학회 2017 Steel and Composite Structures, An International J Vol.24 No.3
In this work, transient heat transfer analysis of functionally graded (FG) carbon nanotube reinforced nanocomposite (CNTRC) cylinders with various essential and natural boundary conditions is investigated by a mesh-free method. The cylinders are subjected to thermal flux, convection environments and constant temperature faces. The material properties of the nanocomposite are estimated by an extended micro mechanical model in volume fraction form. The distribution of carbon nanotube (CNT) has a linear variation along the radial direction of axisymmetric cylinder. In the mesh-free analysis, moving least squares shape functions are used for approximation of temperature field in the weak form of heat transform equation and the transformation method is used for the imposition of essential boundary conditions. Newmark method is applied for solution time depended problem. The effects of CNT distribution pattern and volume fraction, cylinder thickness and boundary conditions are investigated on the transient temperature field of the nanocomposite cylinders.
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