Person: YAYLI, MUSTAFA ÖZGÜR
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YAYLI
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MUSTAFA ÖZGÜR
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Publication Buckling analysis of nanobeams with deformable boundaries via doublet mechanics(Springer, 2021-09-07) Civalek, Ömer; Uzun, Büşra; Yaylı, Mustafa Özgür; UZUN, BÜŞRA; YAYLI, MUSTAFA ÖZGÜR; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/İnşaat Mühendisliği Bölümü; 0000-0002-7636-7170; 0000-0003-2231-170X; AAJ-6390-2021; ABE-6914-2020Buckling analysis of nanobeams with deformable boundary conditions is researched within the framework of doublet mechanics. This theory is an alternative nanomechanics theory for continuum modeling of the granular micromaterials. Doublet mechanics theory takes into consideration the small size parameter due to dealing with also granular nanosized structures. In many studies, rigid supporting conditions are explored in the nanomechanical analysis of beams. Even though the supporting conditions are accepted as undeformable, it is not possible to provide the desired rigidity in practice. A few studies have been conducted to explore the effects of deformable boundaries. In the present work, Fourier sine series as well as Stokes' transformation are utilized to attain the eigenvalue formulation and eigenvector characteristics of the problem. The combination of these two methods is a new approach in applied mechanics; at the same time, it is planned to create a bridge between rigid and deformable boundary conditions. By solving various examples, the accuracy of the proposed method has been tested and an excellent agreement has been achieved with the literature. In addition, the effect of the springs in the boundaries on the critical buckling load has been examined and given in a series of graphs.Publication Finite element formulation for nano-scaled beam elements(Wiley, 2021-12-02) Civalek, Ömer; Uzun, Buşra; Yaylı, Mustafa Özgür; YAYLI, MUSTAFA ÖZGÜR; UZUN, BÜŞRA; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/İnşaat Mühendisliği Bölümü; 0000-0003-1907-9479; 0000-0003-2231-170X; ABE-6914-2020; AAJ-6390-2021In the present study, size-dependent buckling and free vibration behaviors of single-walled boron nitride nanotube (SWBNNT) are performed in conjunction with various size-dependent elasticity theories. Modified couple stress theory (MCST) and Eringen's nonlocal elasticity theory are used for size-dependent models of SWBNNT. Also, the buckling loads and frequencies are obtained by using local theory to emphasize the effects and differences of these size-dependent theories. Consequently, three different elasticity theories (two non-classical and one classical) are utilized to achieve the detailed buckling and vibration analyses of SWBNNT. In this study, the buckling loads and frequencies of SWBNNTs are obtained via presented finite element formulation. In the finite element procedures based on two different size-dependent elasticity theories, matrices containing the small size parameter are derived. With these matrices containing the small size parameters, eigenvalue problems for buckling and free vibration analyses are formed. The buckling loads and frequency values of the SWBNNTs under the size effect are obtained. The influences of the dimensionless nonlocal parameter, dimensionless material length scale parameter, length-to-diameter ratio and boundary conditions on nanotube's buckling and vibration characteristics are investigated. In addition to these influences, the rotary inertia effect neglected in many other studies is also examined.Publication Longitudinal vibration analysis of FG nanorod restrained with axial springs using doublet mechanics(Taylor & Francis, 2021-10-26) Civalek, Ömer; Uzun, Büsra; Yaylı, Mustafa Özgür; UZUN, BÜŞRA; YAYLI, MUSTAFA ÖZGÜR; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/İnşaat Mühendisliği Bölümü.; 0000-0002-7636-7170; 0000-0003-2231-170X; AAJ-6390-2021; ABE-6914-2020In the current paper, the free longitudinal vibration response of axially restrained functionally graded nanorods is presented for the first time based on the doublet mechanics theory. Size dependent nanorod is considered to be made of functionally graded material consist of ceramic and metal constituents. It is assumed that the material properties of the functionally graded nanorod are assumed to vary in the radial direction. The aim of this study is that to investigate the influences of various parameters such as functionally graded index, small size parameter, length of the nanorod, mode number and spring stiffness on vibration behaviors of functionally graded nanorod restrained with axial springs at both ends. For this purpose, Fourier sine series are used to define the axial deflection of the functionally graded nanorod. Then, an eigenvalue approach is established for longitudinal vibrational frequencies thanks to Stokes' transformation to deformable axial springs. Thus, the presented eigenvalue solution method is attributed to both rigid and deformable boundary conditions for the axial vibration of the functionally graded nanorod. With the help of the results obtained with the presented eigenvalue problem, it is observed that the parameters examined cause significant changes in the frequencies of the functionally graded nanorod.Publication Assessment of electric energy generation and installed power capacity in Turkey(Shahrood Univ Technology, 2021-07-01) Kandemir, Suheyla Yerel; Yaylı, Mustafa Özgür; Açıkkalp, Emin; YAYLI, MUSTAFA ÖZGÜR; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/İnşaat Mühendisliği Bölümü; 0000-0003-2231-170X; AAJ-6390-2021Renewable energy is one of the sustainable energy sources, the use of which has increased considerably in the recent years. Today, the wind energy is an essential renewable energy source that does not have a depletion problem. In this work, electricity generation from the wind energy and installed power capacity in Turkey is examined. First, the dataset of electrical energy production (GWh) and the installed power capacity (MW) between 2010 and 2019 are used. Then the electrical energy generation and installed power capacity are evaluated by the trend analysis. Different models are used in the trend analysis, and the results obtained from these models are evaluated with MAPE, MAD, and MSD. Finally, the most suitable models for electric power generation and installed power capacity are determined by evaluating the results.Publication Stability analysis of a rotationally restrained microbar embedded in an elastic matrix using strain gradient elasticity(De Gruyter Poland, 2019-01-01) Yaylı, Mustafa Özgür; YAYLI, MUSTAFA ÖZGÜR; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/İnşaat Mühendisliği Bölümü.; 0000-0003-2231-170X; AAJ-6390-2021The buckling of rotationally restrained microbars embedded in an elastic matrix is studied within the framework of strain gradient elasticity theory. The elastic matrix is modeled in this study as Winkler's one-parameter elastic matrix. Fourier sine series with a Fourier coefficient is used for describing the deflection of the microbar. An eigenvalue problem is obtained for buckling modes with the aid of implementing Stokes' transformation to force boundary conditions. This mathematical model bridges the gap between rigid and the restrained boundary conditions. The influences of rotational restraints, small scale parameter and surrounding elastic matrix on the critical buckling load are discussed and compared with those available in the literature. It is concluded from analytical results that the critical buckling load of microbar is dependent upon rotational restraints, surrounding elastic matrix and the material scale parameter. Similarly, the dependencies of the critical buckling load on material scale parameter, surrounding elastic medium and rotational restraints are significant.Publication Size-dependent free vibration of silicon nanobeams with different boundary conditions and beam theories(Polish Acad Sciences Inst Physics, 2021-08-01) Uzun, Büşra; Yayli, Mustafa Özgür; UZUN, BÜŞRA; YAYLI, MUSTAFA ÖZGÜR; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/İnşaat Mühendisliği Bölümü; 0000-0002-7636-7170; 0000-0003-2231-170X; ABE-6914-2020; AAJ-6390-2021This paper aims to investigate the size effect on the free vibration responses of nanobeams with various boundary conditions, especially guide supported boundary conditions. It is seen that the boundary conditions examined in the previously published articles are mostly clamped-clamped, simply supported at both ends and clamped-simply supported. The difference of this article is that it examines the size effect based on the modified couple stress theory on vibrations of nanobeams with guide supported boundary conditions as well. In addition, the influences of the cross-section and the rotary inertia effect change on the vibrational responses of the nanobeams are pursued as a case study. A finite element method procedure is utilized to calculate the free vibrational frequencies of nanobeams.Publication Assessment of housing energy consumption in Turkey(LOP, 2016-01-01) Kandemir, Süheyla Yerel; Çerçevik, Ali Erdem; Ankara, Hüseyin; Yaylı, Mustafa Özgür; IOP; YAYLI, MUSTAFA ÖZGÜR; Uludağ Üniversitesi; 0000-0003-2231-170X; AAJ-6390-2021In this study, we analyze housing energy consumption in Turkey. The energy consumption is evaluated by using the multivariate techniques such as cluster analysis and multidimensional scaling (MDS) analysis. The number of clusters for housing energy consumption was selected as five years. Finally, cluster and MDS analysis results show that the 2009 and 2010 was the most similar consumption years in housing energy consumption. Finally, this paper present that the usefulness of cluster and MDS analysis for assessment in the energy consumption.Publication Winkler-pasternak foundation effect on the buckling loads of arbitrarily rigid or restrained supported nonlocal beams made of different fgm and porosity distributions(Wiley-v C H Verlag Gmbh, 2023-10-20) Uzun, Büşra; UZUN, BÜŞRA; Yaylı, Mustafa Özgür; YAYLI, MUSTAFA ÖZGÜR; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Kardiyoloji Anabilim Dalı.; 0000-0002-7636-7170; 0000-0003-2231-170X; ABE-6914-2020; AAJ-6390-2021The present research investigates lateral stability of a functionally graded nanobeam using Eringen's differential nonlocal elasticity model under rigid (clamped, pinned, free) and deformable (lateral, rotational restraints) boundary conditions. Sigmoid and power law have been employed as grading laws to study the influence of the material distribution on the snap-buckling analysis of a nanobeam with arbitrary boundary conditions. Moreover, Fourier sine series with Stokes' transformation are employed to investigate the effects of boundary conditions on the stability response of nanobeams embedded in a Pasternak foundation. A parametric study has been performed to investigate the effect of deformable boundaries, Pasternak foundation and small-scale parameters on the stability response of the nanobeam and the results have been presented in a series of tables and figures. It has been observed that consideration of the small-scale parameter, Pasternak foundation, deformable boundaries and functionally grading index (of sigmoid and power-law) are essential while analyzing the static stability response. The obtained analytical results may be used as benchmarks in future researches of functionally graded nanobeams embedded in an elastic medium.Publication Buckling analysis of perforated nano/microbeams with deformable boundary conditions via nonlocal strain gradient elasticity(Techno-Press, 2023-10-01) Kafkas, Uğur; Ünal, Yunus; Yayli, M. Özgür; Uzun, Büşra; Ünal, Yunus; YAYLI, MUSTAFA ÖZGÜR; UZUN, BÜŞRA; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/İnşaat Mühendisliği Bölümü.; 0000-0002-7636-7170; ABE-6914-2020; JTF-6675-2023; JTS-2032-2023This work aims to present a solution for the buckling behavior of perforated nano/microbeams with deformable boundary conditions using nonlocal strain gradient theory (NLSGT). For the first time, a solution that can provide buckling loads based on the non-local and strain gradient effects of perforated nanostructures on an elastic foundation, while taking into account both deformable and rigid boundary conditions. Stokes' transformation and Fourier series are used to realize this aim and determine the buckling loads under various boundary conditions. We employ the NLSGT to account for size-dependent effects and utilize the Winkler model to formulate the elastic foundation. The buckling behavior of the perforated nano/microbeams restrained with lateral springs at both ends is studied for various parameters such as the number of holes, the length and filling ratio of the perforated beam, the internal length, the nonlocal parameter and the dimensionless foundation parameter. Our results indicate that the number of holes and filling ratio significantly affect the buckling response of perforated nano/microbeams. Increasing the filling ratio increases buckling loads, while increasing the number of holes decreases buckling loads. The effects of the non-local and internal length parameters on the buckling behavior of the perforated nano/microbeams are also discussed. These material length parameters have opposite effects on the variation of buckling loads. This study presents an effective eigenvalue solution based on Stokes' transformation and Fourier series of the restrained nano/microbeams under the effects of elastic medium, perforation parameters, deformable boundaries and nonlocal strain gradient elasticity for the first time.Publication Porosity and deformable boundary effects on the dynamic of nonlocal sigmoid and power-law fg nanobeams embedded in the winkler-pasternak medium(Springer Heidelberg, 2023-07-02) UZUN, BÜŞRA; Uzun, Büşra; YAYLI, MUSTAFA ÖZGÜR; Yaylı, Mustafa Özgür; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/İnşaat Mühendisliği Bölümü.; 0000-0002-7636-7170; ABE-6914-2020ObjectiveThe aim of this study is to solve the free vibrations of embedded functionally graded porous and non-porous nanobeams with different material distributions (power-law and sigmoid) under general elastic boundary conditions to better understand the dynamic properties. This form of model has the benefit of allowing one to handle the rigid or restrained supporting conditions.MethodA solution method using the Fourier sine series and Stokes' transform together is adopted. This method is used to study the effects of deformable boundary conditions as well as rigid boundary conditions, which are common in the literature. In the current study, two sets of equations for both elastic support conditions consisting of infinite series are derived. Then, eigenvalue problems are set up for the analytical solution. The eigenvalues of the established problems give the vibration frequencies of the embedded functionally graded porous/non-porous nanobeams.ConclusionsThe proposed models are effective for studying arbitrary boundary conditions. The accuracy of the model is compared with some results from the literature for rigid boundary conditions. Looking at the frequencies of functionally graded porous/non-porous nanobeams, it is seen that the studied parameters such as foundation parameters, nonlocal parameter, grading index, elastic spring stiffness produce changes that cannot be ignored.
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