Mirali Nuraliyev - Academia.edu (original) (raw)
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Papers by Mirali Nuraliyev
DergiPark (Istanbul University), May 3, 2024
Kutu şekilli kısa ve uzun kolonların en uygun-optimum en kesit tasarımı için, analitik bir prosed... more Kutu şekilli kısa ve uzun kolonların en uygun-optimum en kesit tasarımı için, analitik bir prosedür geliştirilmiştir. En uygun/optimum kutu kesitin dizayn edilmesi, iki şart gözetiminde gerçekleştirilmiştir. Söz konusu tasarım, kısa kolonlar için hem mukavemeti hem de lokal burkulmanı kendinde ihtiva eden kombine dayanım şartı gözetiminde gerçekleştirilirken uzun kolonlar için bu tasarım, hem mukavemeti hem de global burkulmanı kendinde ihtiva eden kombine dayanım şartı gözetiminde yapılmıştır. Optimizasyon problemi, kutu kesitin değişken parametreleri ile burkulma katsayıları arasında fonksiyonel bağıntılar oluşturularak, kısa kolonlarda kesit alanının minimize edilmesi, uzun kolonlarda ise normal gerilmenin maksimize edilmesi şeklinde ele alınmıştır. Söz konusu problemin çözümü için bir ''Geometrik En Kesit Tasarım Modeli'' önerilmiştir. Kombine dayanım şartlarını sağlayan en uygun/optimum kutu kesitin, aynı boyutlarda dolu bir dikdörtgen kesitin orta kısmının simetrik şekilde çıkartılarak tamamının veya bir kısmının dikdörtgenin iki yanlarına eşit olarak eklenmesi yoluyla elde edilen bir kutu kesitten ibaret olduğu varsayılmıştır. Bu varsayım, "Geliştirilen Geometrik Tasarım Modeli"aracılığıyla doğrulanmıştır. Dolu dikdörtgen kesitten çıkartılan kısmı, onun yanlarına ne kadar az eklenirse, kutu kesit alanından elde edilen tasarruf da o kadar büyük olur öngörüsü analitik olarak ispat edilmiş ve sayısal örneklerle de doğrulanmıştır.
Mechanics of advanced materials and structures, Jun 21, 2024
Journal of innovative engineering and natural science, Feb 3, 2024
Square hollow sections (SHSs) have been receiving a great deal of attention for use as load-carry... more Square hollow sections (SHSs) have been receiving a great deal of attention for use as load-carrying components in a broad range of application fields, including construction and automotive, due to their many promising mechanical advantages over solid sections, such as a higher strength-to-weight ratio [1-6]. This important mechanical quality offered by SHSs makes them very ideal for use in specific applications where high strength with low weight is required [7]. As with other hollow section members possessing different section shapes including rectangular and circular, understanding their failure mechanism under loads is highly imperative for reliable design. The robust design of SHSs is generally achieved by considering both adequate-strength and local stability requirements in a balanced way [8-11]. Taking into account the adequate-strength criterion alone can lead the SHS to suffer local buckling prior to reaching its maximum load-carrying capacity, which brings additional material cost [8, 12]. In other words, a critical elastic local buckling load of the SHS needs to be considered its collapse load since the SHS cannot sustain any additional load after undergoing local elastic buckling [13-15].
Journal of Innovative Engineering and Natural Science, Jan 9, 2024
Since the invention of steel, hollow section members have been widely used as structural componen... more Since the invention of steel, hollow section members have been widely used as structural components in numerous application fields including construction and aviation due to their special features [1, 2]. The hollow sections are generally recognized for their good mechanical performance against different types of loadings such as compression, torsion, and bending in all directions [3]. Nevertheless, one of the main drawbacks of hollow sections is their higher production costs compared to other sections [3]. Thus, the ubiquity of hollow sections in many industrial application fields as well as their higher manufacturing costs make their optimal design more important for the reduction of material cost. In a robust optimal design, significant design aspects, including strength and material type, need to be taken into consideration in a balanced way [3-7]. As with other types of hollow sections, the optimal cross-section dimensions of rectangular hollow sections (RHSs) subjected to any type of load can be determined based on either adequate-strength [8-12] or adequate-stiffness [10, 13, 14]. In those two approaches, a design objective is to achieve minimum weight by determining the optimal cross-section dimensions of RHSs that satisfy strength requirements since a type of material from which a structure is manufactured, as well as its associated mechanical properties are known prior to the design. In other words, the objective function which gives the optimal cross-section dimensions and therefore minimum mass is defined in both approaches based on the satisfaction of strength requirements. Different from them, an optimal design can
Mechanics Based Design of Structures and Machines, Sep 22, 2023
Zenodo (CERN European Organization for Nuclear Research), May 10, 2023
A very limited exploratory research has been conducted to elucidate the natural particle addition... more A very limited exploratory research has been conducted to elucidate the natural particle addition effects on the dynamic characteristics of polymers including natural frequency, mode shape, and damping ratio. In response to this, the present study has been dedicated to the examination of the effect of added hemp fiber particles on the modal parameters of an industrially important Acrylonitrile-Butadiene-Styrene (ABS) thermoplastic. Biocomposites were fabricated by incorporating hemp particles into ABS at three various weight fractions (1%, 5%, and 10 %). Modal testing aiming to measure the associated dynamic modal parameters was performed on both the rectangular neat ABS and ABS biocomposites with a dimension of 120x145 mm by using a roving impact hammer method with a fixed response measurement point. A one-edge clamped boundary condition was successfully applied to the testing specimens. The modal test results revealed that the incorporation of hemp particles generally enhances the modal parameters of neat ABS such as the first three natural frequencies and associated damping ratios. The experimental results also put forth that the mentioned modal parameters tend to improve considerably with increasing particle content. Regardless of the particle weight fraction, it was found that the incorporation of hemp particles possesses an insignificant influence on the patterns of the first three mode shapes of neat ABS.
Zenodo (CERN European Organization for Nuclear Research), May 10, 2023
This study deals with the numerical verifications of the experimentally determined dynamic charac... more This study deals with the numerical verifications of the experimentally determined dynamic characteristics of neat Acrylonitrile-Butadiene-Styrene (ABS) thermoplastic as well as hemp fiber particle-added ABS possessing three various weight fractions (1%, 5%, and 10%).To this end, significant dynamic modal parameters including natural frequencies and corresponding mode shapes have been predicted by performing finite element analyses in Abaqus engineering software on the rectangular plates with a dimension of 120x145mm whose one edge is clamped and the remaining ones are completely free. Eigenvalue extraction to estimate the first three natural frequencies and the corresponding mode shapes of the rectangular plates has been achieved by using the Lanczos eigensolver which is regarded as one of the most powerful methods for the solution of large generalized eigenvalue problems. The first three natural frequencies and corresponding mode shapes have been successfully extracted from the finite element analyses. The predicted dynamic modal parameters have been favorably compared to the modal test measurements. Thus, the experimental results have been validated against the numerical predictions.
Mechanics Based Design of Structures and Machines
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science
A satisfactory reproduction of three-point bending and impact test data of an industrially import... more A satisfactory reproduction of three-point bending and impact test data of an industrially important amorphous polymer, acrylonitrile-butadiene-styrene (ABS), in the context of finite element analysis is of prime importance to industry. Constitutive material models developed for amorphous polymers are capable of describing their complex mechanical behavior under multiaxial loadings with a variety of success; therefore, the computational accuracy directly depends on the selection of constitutive model and a proper determination of its associated parameters. Thus, this study aimed at accurately predicting the multiaxial mechanical behavior of ABS by the Anand–Gurtin elastic–viscoplastic material model selected as the constitutive model and employed for the first time in the numerical implementations of the three-point bending and impact tests of ABS. To this end, the constitutive model parameters never identified for ABS before was first determined mainly depending on uniaxial compres...
In this study, analytical analysis was conducted to determine optimum sizes of solid rectangular ... more In this study, analytical analysis was conducted to determine optimum sizes of solid rectangular section subjected to bending together with torsion. Optimization criteria was selected minimum section area and strength conditions were applied as boundary functions. Torsion moment Mb, bending moments My and Mz was subjected about x, y and z axes, respectively. Optimization processes were performed using Euler-Lagrange Optimization Method according to corner point (A), midpoint of short edge (E) and midpoint of long edge (K) known as critical points for rectangular section is h/b ≥1. Optimum solution (hopt, bopt) was detected to be absent according to stress state at K. It was found that this solution did not satisfy the strength conditions according to stress state at E at other points. It was found that there is an optimal solution at A point. Also it is valid for entire of section. Analytic formulas belonging to section sizes were obtained for Mb ≤ My ≤ Mz valid range. Savings obt...
In this study, analytical investigations were carried out on the determination of the optimum cro... more In this study, analytical investigations were carried out on the determination of the optimum cross-sectional dimensions of the rectangular prismatic beams which were forced to bend with an oblique bending and tension (or compression) under different loads. The minimum cross-sectional area, which allows the reduction of the beam, is accepted as the optimization criterion. Based on the strength conditions at the oblique bending, in order to determine the optimum cross-sectional dimensions and the minimum cross-sectional area analytical formulas were obtained by using the Lagrange Uncertain Multipliers method. For beams which are only forced to oblique bending, it has been determined that the tangent of the angle that the M-force pair or P-force makes with the vertical plane is equal to the optimum ratio of the (b/h). It was determined that the optimum (b/h) ratio of the beams which were forced to oblique bending subjected to tensile or compression, is equal to the ratio of the coordi...
DergiPark (Istanbul University), May 3, 2024
Kutu şekilli kısa ve uzun kolonların en uygun-optimum en kesit tasarımı için, analitik bir prosed... more Kutu şekilli kısa ve uzun kolonların en uygun-optimum en kesit tasarımı için, analitik bir prosedür geliştirilmiştir. En uygun/optimum kutu kesitin dizayn edilmesi, iki şart gözetiminde gerçekleştirilmiştir. Söz konusu tasarım, kısa kolonlar için hem mukavemeti hem de lokal burkulmanı kendinde ihtiva eden kombine dayanım şartı gözetiminde gerçekleştirilirken uzun kolonlar için bu tasarım, hem mukavemeti hem de global burkulmanı kendinde ihtiva eden kombine dayanım şartı gözetiminde yapılmıştır. Optimizasyon problemi, kutu kesitin değişken parametreleri ile burkulma katsayıları arasında fonksiyonel bağıntılar oluşturularak, kısa kolonlarda kesit alanının minimize edilmesi, uzun kolonlarda ise normal gerilmenin maksimize edilmesi şeklinde ele alınmıştır. Söz konusu problemin çözümü için bir ''Geometrik En Kesit Tasarım Modeli'' önerilmiştir. Kombine dayanım şartlarını sağlayan en uygun/optimum kutu kesitin, aynı boyutlarda dolu bir dikdörtgen kesitin orta kısmının simetrik şekilde çıkartılarak tamamının veya bir kısmının dikdörtgenin iki yanlarına eşit olarak eklenmesi yoluyla elde edilen bir kutu kesitten ibaret olduğu varsayılmıştır. Bu varsayım, "Geliştirilen Geometrik Tasarım Modeli"aracılığıyla doğrulanmıştır. Dolu dikdörtgen kesitten çıkartılan kısmı, onun yanlarına ne kadar az eklenirse, kutu kesit alanından elde edilen tasarruf da o kadar büyük olur öngörüsü analitik olarak ispat edilmiş ve sayısal örneklerle de doğrulanmıştır.
Mechanics of advanced materials and structures, Jun 21, 2024
Journal of innovative engineering and natural science, Feb 3, 2024
Square hollow sections (SHSs) have been receiving a great deal of attention for use as load-carry... more Square hollow sections (SHSs) have been receiving a great deal of attention for use as load-carrying components in a broad range of application fields, including construction and automotive, due to their many promising mechanical advantages over solid sections, such as a higher strength-to-weight ratio [1-6]. This important mechanical quality offered by SHSs makes them very ideal for use in specific applications where high strength with low weight is required [7]. As with other hollow section members possessing different section shapes including rectangular and circular, understanding their failure mechanism under loads is highly imperative for reliable design. The robust design of SHSs is generally achieved by considering both adequate-strength and local stability requirements in a balanced way [8-11]. Taking into account the adequate-strength criterion alone can lead the SHS to suffer local buckling prior to reaching its maximum load-carrying capacity, which brings additional material cost [8, 12]. In other words, a critical elastic local buckling load of the SHS needs to be considered its collapse load since the SHS cannot sustain any additional load after undergoing local elastic buckling [13-15].
Journal of Innovative Engineering and Natural Science, Jan 9, 2024
Since the invention of steel, hollow section members have been widely used as structural componen... more Since the invention of steel, hollow section members have been widely used as structural components in numerous application fields including construction and aviation due to their special features [1, 2]. The hollow sections are generally recognized for their good mechanical performance against different types of loadings such as compression, torsion, and bending in all directions [3]. Nevertheless, one of the main drawbacks of hollow sections is their higher production costs compared to other sections [3]. Thus, the ubiquity of hollow sections in many industrial application fields as well as their higher manufacturing costs make their optimal design more important for the reduction of material cost. In a robust optimal design, significant design aspects, including strength and material type, need to be taken into consideration in a balanced way [3-7]. As with other types of hollow sections, the optimal cross-section dimensions of rectangular hollow sections (RHSs) subjected to any type of load can be determined based on either adequate-strength [8-12] or adequate-stiffness [10, 13, 14]. In those two approaches, a design objective is to achieve minimum weight by determining the optimal cross-section dimensions of RHSs that satisfy strength requirements since a type of material from which a structure is manufactured, as well as its associated mechanical properties are known prior to the design. In other words, the objective function which gives the optimal cross-section dimensions and therefore minimum mass is defined in both approaches based on the satisfaction of strength requirements. Different from them, an optimal design can
Mechanics Based Design of Structures and Machines, Sep 22, 2023
Zenodo (CERN European Organization for Nuclear Research), May 10, 2023
A very limited exploratory research has been conducted to elucidate the natural particle addition... more A very limited exploratory research has been conducted to elucidate the natural particle addition effects on the dynamic characteristics of polymers including natural frequency, mode shape, and damping ratio. In response to this, the present study has been dedicated to the examination of the effect of added hemp fiber particles on the modal parameters of an industrially important Acrylonitrile-Butadiene-Styrene (ABS) thermoplastic. Biocomposites were fabricated by incorporating hemp particles into ABS at three various weight fractions (1%, 5%, and 10 %). Modal testing aiming to measure the associated dynamic modal parameters was performed on both the rectangular neat ABS and ABS biocomposites with a dimension of 120x145 mm by using a roving impact hammer method with a fixed response measurement point. A one-edge clamped boundary condition was successfully applied to the testing specimens. The modal test results revealed that the incorporation of hemp particles generally enhances the modal parameters of neat ABS such as the first three natural frequencies and associated damping ratios. The experimental results also put forth that the mentioned modal parameters tend to improve considerably with increasing particle content. Regardless of the particle weight fraction, it was found that the incorporation of hemp particles possesses an insignificant influence on the patterns of the first three mode shapes of neat ABS.
Zenodo (CERN European Organization for Nuclear Research), May 10, 2023
This study deals with the numerical verifications of the experimentally determined dynamic charac... more This study deals with the numerical verifications of the experimentally determined dynamic characteristics of neat Acrylonitrile-Butadiene-Styrene (ABS) thermoplastic as well as hemp fiber particle-added ABS possessing three various weight fractions (1%, 5%, and 10%).To this end, significant dynamic modal parameters including natural frequencies and corresponding mode shapes have been predicted by performing finite element analyses in Abaqus engineering software on the rectangular plates with a dimension of 120x145mm whose one edge is clamped and the remaining ones are completely free. Eigenvalue extraction to estimate the first three natural frequencies and the corresponding mode shapes of the rectangular plates has been achieved by using the Lanczos eigensolver which is regarded as one of the most powerful methods for the solution of large generalized eigenvalue problems. The first three natural frequencies and corresponding mode shapes have been successfully extracted from the finite element analyses. The predicted dynamic modal parameters have been favorably compared to the modal test measurements. Thus, the experimental results have been validated against the numerical predictions.
Mechanics Based Design of Structures and Machines
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science
A satisfactory reproduction of three-point bending and impact test data of an industrially import... more A satisfactory reproduction of three-point bending and impact test data of an industrially important amorphous polymer, acrylonitrile-butadiene-styrene (ABS), in the context of finite element analysis is of prime importance to industry. Constitutive material models developed for amorphous polymers are capable of describing their complex mechanical behavior under multiaxial loadings with a variety of success; therefore, the computational accuracy directly depends on the selection of constitutive model and a proper determination of its associated parameters. Thus, this study aimed at accurately predicting the multiaxial mechanical behavior of ABS by the Anand–Gurtin elastic–viscoplastic material model selected as the constitutive model and employed for the first time in the numerical implementations of the three-point bending and impact tests of ABS. To this end, the constitutive model parameters never identified for ABS before was first determined mainly depending on uniaxial compres...
In this study, analytical analysis was conducted to determine optimum sizes of solid rectangular ... more In this study, analytical analysis was conducted to determine optimum sizes of solid rectangular section subjected to bending together with torsion. Optimization criteria was selected minimum section area and strength conditions were applied as boundary functions. Torsion moment Mb, bending moments My and Mz was subjected about x, y and z axes, respectively. Optimization processes were performed using Euler-Lagrange Optimization Method according to corner point (A), midpoint of short edge (E) and midpoint of long edge (K) known as critical points for rectangular section is h/b ≥1. Optimum solution (hopt, bopt) was detected to be absent according to stress state at K. It was found that this solution did not satisfy the strength conditions according to stress state at E at other points. It was found that there is an optimal solution at A point. Also it is valid for entire of section. Analytic formulas belonging to section sizes were obtained for Mb ≤ My ≤ Mz valid range. Savings obt...
In this study, analytical investigations were carried out on the determination of the optimum cro... more In this study, analytical investigations were carried out on the determination of the optimum cross-sectional dimensions of the rectangular prismatic beams which were forced to bend with an oblique bending and tension (or compression) under different loads. The minimum cross-sectional area, which allows the reduction of the beam, is accepted as the optimization criterion. Based on the strength conditions at the oblique bending, in order to determine the optimum cross-sectional dimensions and the minimum cross-sectional area analytical formulas were obtained by using the Lagrange Uncertain Multipliers method. For beams which are only forced to oblique bending, it has been determined that the tangent of the angle that the M-force pair or P-force makes with the vertical plane is equal to the optimum ratio of the (b/h). It was determined that the optimum (b/h) ratio of the beams which were forced to oblique bending subjected to tensile or compression, is equal to the ratio of the coordi...