Yazar "Dirikolu, M. Husnu" seçeneğine göre listele

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  • Küçük Resim
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    The Effect of Crack Geometry on the Nondestructive Fault Detection in a Composite Beam
    (Int Inst Acoustics & Vibration, 2016) Orhan, Sadettin; Luy, Murat; Dirikolu, M. Husnu; Zorlu, Gazi Mustafa
    Defects in structures may be inherited from materials and manufacturing or they develop during service. Defects may cause catastrophic failure, which is why their detection and classification are important issues. Many aspects of defects have already been dealt with, but with wider applications of non-destructive testing methods to composite materials. However, the effect of arbitrary and random defect geometry on the applicability of these methods has been overlooked. In order to investigate this issue, this study carries out a free vibration analysis of a specially orthotropic cracked cantilever beam that was manufactured by Pultrusion. A new crack model, unlike the widely known V-shaped crack, is introduced and the effect of crack depth on the natural frequency is investigated, both experimentally and numerically. The results obtained from both the new- and the V-shaped models are compared with each other, and it is revealed that the results are not sensitive to the geometry change.
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    Öğe
    EXTRUSION FORMING OF A DOUBLE BASE SOLID ROCKET PROPELLANT BY FINITE ELEMENT METHOD
    (Pamukkale Univ, 2007) Kalaycioglu, Baris; Dirikolu, M. Husnu; Celik, Veli
    In this study, three dimensional modelling of extrusion forming of a double base solid rocket propellant is performed on Ansys (R) finite element simulation package. For the purpose of initial model construction and later comparisons with elastoviscoplastik model, the solid propellant is assumed to obey the elastic-plastic material response during the direct extrusion process. Taking into account the contact surface behavior with Coulomb friction and geometric and material nonlinearities, an incremental large large strain solution methodology has been adapted in the simulation. The hydrostatic pressure, stress, strain, and displacement values during extrusion of the solid rocket propellant are obtained from the simulation.
  • Küçük Resim
    Öğe
    Investigation of the design of a metal-lined fully wrapped composite vessel under high internal pressure
    (Taylor & Francis Ltd, 2010) Kalaycioglu, Baris; Dirikolu, M. Husnu
    In this study, a Type III composite pressure vessel (ISO 11439: 2000) loaded with high internal pressure is investigated in terms of the effect of the orientation of the element coordinate system while simulating the continuous variation of the fibre angle, the effect of symmetric and non-symmetric composite wall stacking sequences, and lastly, a stacking sequence evaluation for reducing the cylindrical section-end cap transition region stress concentration. The research was performed using an Ansys (R) model with 2.91 volume, 6061 T6 aluminium liner/Kevlar (R) 49-Epoxy vessel material, and a service internal pressure loading of 22 MPa. The results show that symmetric stacking sequences give higher burst pressures by up to 15%. Stacking sequence evaluations provided a further 7% pressure-carrying capacity as well as reduced stress concentration in the transition region. Finally, the Type III vessel under consideration provides a 45% lighter construction as compared with an all metal (Type I) vessel.