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6 results on '"Kara, Ali"'

5. Effect of heat treatment on the blast loading response of combined geometry shell core sandwich structures

Author

Alper Taşdemirci, Kivanc Turan, Mustafa Güden, Ali Kara, Selim Sahin, TR114512, TR114738, Taşdemirci, Alper, Kara, Ali, Turan, Kıvanç, Şahin, Selim, Güden, Mustafa, and Izmir Institute of Technology. Mechanical Engineering

Subjects
Materials science, CONWEP, Mechanical Engineering, Shell (structure), 020101 civil engineering, Geometry, 02 engineering and technology, Building and Construction, Heat treatment, Shells, Finite element method, 0201 civil engineering, Core (optical fiber), Stress (mechanics), 020303 mechanical engineering & transports, 0203 mechanical engineering, Energy absorption, Cylinder, Reversing, Sandwich structures, Deep drawing, Composite material, Blast loading, Civil and Structural Engineering
Abstract

The effect of heat treatment on the dynamic crushing and energy absorption behavior of combined geometry shell cores (hemisphere and cylinder) of sandwich structures were investigated both experimentally and numerically. The applied heat treatment on the combined geometry shell cores relieved the stress caused by deep drawing, diminishing the peak transmitted forces. The verified numerical models of the as-received and heat-treated combined geometry shells were used to model blast loading of various sandwich configurations and the additional sandwich configurations of reversing the cylindrical side of the cores to the impacted side. Both the applied heat-treatment and the reversing process decreased the magnitude of the force transmitted to the protected structure. The applied heat treatment increased the arrival time of blast force wave to the protected structure, while the reversing resulted in opposite., Scientific and Technical Council of Turkey (TUBITAK 112M141)

Published
2016

6. Dynamic crushing and energy absorption of sandwich structures with combined geometry shell cores

Author

Ali Kara, Selim Sahin, Kivanc Turan, Alper Taşdemirci, TR114512, Taşdemirci, Alper, Kara, Ali, Turan, Kıvanç, Şahin, Selim, and Izmir Institute of Technology. Mechanical Engineering

Subjects
High strain rate, Materials science, Combined geometry shells, Crushing behavior, media_common.quotation_subject, Shell (structure), Geometry, Inertia, Energy absorption, Sandwich structures, Composite material, Civil and Structural Engineering, media_common, integumentary system, musculoskeletal, neural, and ocular physiology, Mechanical Engineering, Building and Construction, Strain rate, Finite element method, Computer Science::Multiagent Systems, surgical procedures, operative, nervous system, Buckling, Energy absorbtion, Micro inertia, Deformation (engineering)
Abstract

Dynamic crushing and energy absorption characteristics of sandwich structures with combined geometry shell cores were investigated experimentally and numerically. The effect of strain rate on the crushing behavior was presented by the crushing tests at quasi-static, intermediate and high strain rate regimes. It was shown that absorbed energy increased with increasing impact velocity. The effect of confinement on crushing behavior was shown by conducting confined experiments at quasi-static and dynamic rates. Higher buckling loads at lower deformation were observed in confined quasi-static crushing due to additional lateral support and friction provided by confinement wall. By using fictitious numerical models with strain rate insensitive material models, the effect of inertia and strain rate on crushing were shown. It was observed that, increase in impact velocity caused increase in inertial effects and strain rate effects were nearly independent from the impact velocity. The effects of multilayering were also investigated numerically., Scientific and Technical Council of Turkey (TUBITAK-112M141)

Published
2015

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