Mechanical Engineering / Makina Mühendisliği

Permanent URI for this collectionhttps://hdl.handle.net/11147/4129

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Institution Author: search.filters.institutionAuthor.Güden, MustafaSubject: search.filters.subject.Crushing behavior

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Now showing 1 - 6 of 6
  • Article
    Citation - WoS: 10
    Citation - Scopus: 12
    Testing and Modeling Blast Loading of a Sandwich Structure Cored With a Bio-Inspired (balanus) Core
    (Elsevier, 2022) Tüzgel, Fırat; Akbulut, Emine Fulya; Güzel, Erkan; Yücesoy, Atacan; Şahin, Selim; Taşdemirci, Alper; Güden, Mustafa
    The blast loading response of a sandwich structure consisted of bio-inspired (balanus) cores/units was investigated experimentally and numerically. A Direct Pressure Pulse (DPP) set-up was used to impose a blast-like loading. The equivalent blast conditions corresponding to the used impact velocities were implemented in the models. A benchmark study was performed by using three different methods namely pure Lagrangian, Arbitrary Lagrangian Eulerian, and hybrid. Dynamic crushing behavior was analyzed and exhibited a higher specific energy absorption capacity than its constituents (core and shell). Among the core configurations, all-front configuration was found the most efficient configuration regarding the specific energy absorption.
  • Article
    Citation - WoS: 28
    Citation - Scopus: 28
    Crushing Behavior and Energy Absorption Performance of a Bio-Inspired Metallic Structure: Experimental and Numerical Study
    (Elsevier Ltd., 2018) Taşdemirci, Alper; Akbulut, Emine Fulya; Güzel, Erkan; Tüzgel, Fırat; Yücesoy, Atacan; Şahin, Selim; Güden, Mustafa
    A thin-walled structure inspired from a biologic creature known as balanus was investigated experimentally and numerically under quasi-static and dynamic loads for load-carrying and energy absorption properties. The structure was composed of an inner conical core with a hemispherical cap and an outer shell in frusto-conical shape and formed by deep drawing. The applied deep drawing process was modelled using nonlinear finite element code LS-DYNA to determine the residual stress/strain and the non-linear thickness distribution after the forming process. It was also shown that the load carried by the balanus structure was greater than the arithmetic sum of the load carried by the inner core and by the outer shell separately. Although the mean force increase due to interaction effect at quasi-static strain rate was approximately 5%, while it increased to roughly 26% at dynamic strain rates in drop weight experiments. The numerical models also showed that the outer shell absorbed more energy than the inner core while the difference between the energy absorbing performance of the core and shell decreased with increasing deformation rate. The effect of strain rate and inertia on the increase in crush load increased with increasing impact velocity, while the strain rate effect had greater influence than the inertia on the crush load. The increased load carrying capacity of the balanus at quasi-static and dynamic strain rates was ascribed to the interaction between the core and shell and the confinement effect of the outer shell particularly at dynamic strain rate.
  • Conference Object
    Alüminyum Köpük Dolu Kompozit/alüminyum İkili Tüplerin Ezilme Davranışları
    (Pamukkale Üniversitesi, 2006) Yüksel, Sinan; Tanoğlu, Metin; Güden, Mustafa
    Tüp sarma yöntemiyle hazırlanan ince duyarlı cam fiber takviyeli polyester kompozit/Alüminyum ikili tüplerin ezilme davranışları statik basma hızlarında (25 mm/dak) deneysel incelenmiştir. Tüplerde dolgu malzemesi olarak kullanılan Al köpüğün ezilme yük değerlerine ve deformasyon mekanizmalarına etkileri belirlenmiştir.
  • Article
    Citation - WoS: 27
    Citation - Scopus: 30
    Single- and Double-Layer Aluminum Corrugated Core Sandwiches Under Quasi-Static and Dynamic Loadings
    (SAGE Publications Inc., 2016) Kılıçaslan, Cenk; Odacı, İsmet Kutlay; Güden, Mustafa
    The crushing of single- and double-layer zig-zag trapezoidal corrugated core sandwiches was investigated experimentally and numerically at quasi-static and dynamic rates. The buckling stress of sandwiches increased when the rate increased from quasi-static to dynamic. The increased buckling stresses were ascribed to the micro-inertial effects, which altered the buckling mode of the core from three plastic hinges to higher number of plastic hinge formations. The initial buckling stress was numerically shown to be imperfection sensitive when the imperfection size was comparable with the buckling length. The numerical buckling stresses of zig-zag and straight corrugated cores were similar, while higher inertial effects were found in triangular corrugated core.
  • Article
    Citation - WoS: 40
    Citation - Scopus: 52
    Partial Al Foam Filling of Commercial 1050h14 Al Crash Boxes: the Effect of Box Column Thickness and Foam Relative Density on Energy Absorption
    (Elsevier Ltd., 2010) Toksoy, Ahmet Kaan; Güden, Mustafa
    The crushing behavior of partially Al closed-cell foam filled commercial 1050H14 Al crash boxes was determined at quasi-static and dynamic deformation velocities. The quasi-static and dynamic crushing of the boxes were simulated using the LS-DYNA. The results showed that partial foam filling tended to change the deformation mode of empty boxes from a non-sequential to a sequential folding mode. In general, the experimental and simulation results showed similar mean load values and deformation modes. The SEA values of empty, partially and fully foam filled boxes were predicted as function of box wall thickness between 1 and 3 mm and foam filler relative density between 0 and 0.2, using the analytical equations developed for the mean crushing loads. The analysis indicated that both fully and partially foam filled boxes were energetically more efficient than empty boxes above a critical foam filler relative density. Partial foam filling, however, decreases the critical foam filler density at increasing box wall thicknesses.
  • Article
    Citation - WoS: 53
    Citation - Scopus: 56
    Finite Element and Coupled Finite Element/Smooth Particle Hydrodynamics Modeling of the Quasi-Static Crushing of Empty and Foam-Filled Single, Bitubular and Constraint Hexagonal- and Square-Packed Aluminum Tubes
    (Elsevier Ltd., 2008) Aktay, Levent; Kröplin, Bernd Helmut; Toksoy, Ahmet Kaan; Güden, Mustafa
    The quasi-static axial crushing behavior of empty and Al and polystyrene foam-filled Al single, bitubular and multi-tube-packed (hexagonal and square packing) configurations were investigated experimentally and numerically. Tubes were modeled using finite element and coupled finite element/smooth particle hydrodynamics. The numerical specific absorbed energy (SAE) values, deformation patterns, load values and number of folds formed were found to show agreements with those of experiments. Among the tested tube configurations only hexagonal- and square-packed empty tube designs showed increased SAE values over that of single empty tube. Furthermore, foam-filled multi-tube designs both hexagonal- and square-packed designs were found energetically more efficient than Al foam-filled single tubes at similar foam filler densities. The increased SAE values of multi-tubes were attributed to the frictional forces of the multi-tube designs and constraining effect of the die walls accommodating the tubes.