TR-Dizin

Permanent URI for this collectionhttps://hdl.handle.net/20.500.14411/21

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Browsing TR-Dizin by Institution Author "Akış, Tolga"

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    Article
    Citation - Scopus: 35
    Elastoplastic Response of a Long Functionally Graded Tube Subjected To Internal Pressure
    (2005) Eraslan,A.N.; Akis,T.
    Plane strain analytical solutions to functionally graded elastic and elastic-plastic pressurized tube problems are obtained in the framework of small deformation theory. The modulus of elasticity of the tube material is assumed to vary radially according to a 2 parametric model in a general parabolic form. The analytical plastic model is based on Tresca's yield criterion, its associated flow rule and ideally plastic material behavior. Exact solutions of field equations for elastic and plastic deformations are obtained. It is shown that the elastoplastic response of the functionally graded pressurized tube is affected notably by the radial variation of modulus of elasticity. It is also shown mathematically that the nonhomogeneous solution presented here reduces to that of a homogeneous one by the appropriate choice of the material parameters. © TÜBİTAK.
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    Article
    Citation - WoS: 3
    On the Yielding of Two-Layer Composite Spherical Pressure Vessels
    (Gazi Univ, 2017) Akis, Tolga
    The yielding of two-layer composite spherical pressure vessels under either internal or external pressure is investigated analytically in the framework of small deformations and von Mises yield criterion. It is shown for both pressure cases that depending on the material properties and sphere dimensions, different modes of plasticization may take place. Unlike the deformation behavior of a single layer spherical pressure vessel, yielding may commence at the inner layer or at the outer layer or simultaneously at both layers of the assembly.
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    Radyal Yönde Basınç Uygulanan Fonksiyonel Derecelendirilmiş Malzemeden Yapılmış Uzun Tüplerde Von Mises Kriterine Göre Akmanın Başlaması
    (2015) Akış, Tolga; Eren, Ömür
    İç ya da dış yüzeyden radyal yönde basınçlandırılmış, fonksiyonel derecelendirilmiş malzemeden yapılmış uçları sabitlenmiş uzun bir tüpün elastik davranışı analitik olarak incelenmiştir. Tüpün elastisite modülünün ve akma dayanımının radyal koordinat boyunca lineer olmayan formda değiştikleri varsayılmıştır. Von Mises akma kriteri kullanılarak, fonksiyonel derecelendirme parametrelerinin tüpteki plastik akmanın başlangıcına etkileri incelenmiş, akmanın bu parametrelere bağlı olarak her iki basınç durumu için de önce iç yüzeyden, önce dış yüzeyden, ya da her iki yüzeyden de aynı anda başlayabileceği gözlenmiştir.