Teğet Sınır Şartlarının Ortasından Tekil Yüklü Katmanlı Kompozit Silindirik Panellerin Nonlineer Davranışlarına Etkisi

Abstract

Bu çalışmada, ortasından düşey tekil yük ile yüklü simetrik ve dengeli katmanlı kompozit silindirik panellerin nonlineer davranışlarında düz kenar teğet sınır şartlarının etkisi incelenmiştir. Bu maksatla, toplam Lagrange formulasyonuna dayanan sekiz düğümlü, dejenere ve doğrusal olmayan bir kabuk sonlu elemanı kullanılmıştır. Nonlineer davranışı gözlemleyebilmek için kiriş uzunluğu yöntemi kullanılmıştır. Öncelikle bazı doğrulama problemleri çözülerek eleman geometrik açıdan doğrusal olmayan analiz için doğrulanmıştır. Daha sonra problem farklı dönel sınır şartları, kalınlık ve katman düzenleri için incelenmiştir. Ankastre paneller için elde edilen neticeler teğet doğrultuda her iki kenar veya sadece bir kenar tutulu olduğunda davranışta önemli bir fark olmadığını göstermektedir. Ancak, basit mesnetli paneller için elde edilen neticeler rijitliğinin sadece bir kenar teğetsel doğrultuda tutulduğunda önemli nispette düştüğünü göstermektedir.

Keywords

• Katmanlı kompozit
• Silindirik panel
• Nonlineer davranış
• Teğetsel sınır şartları

THE INFLUENCE OF TANGENTIAL EDGE RESTRAINTS ON THE NONLINEAR RESPONSE OF LAMINATED COMPOSITE CYLINDRICAL PANELS SUBJECT TO A PINCHING FORCE

Abstract

In this study, the influence of straight edge tangential restraints on the nonlinear response of symmetrically laminated and balanced composite cylindrical panels subject to a pinching force is investigated. An 8-node degenerated nonlinear shell element, formulation of which is based on the Total Lagrangian Formulation, is employed for geometrically nonlinear analysis and the Arc-Length Method is used to trace the nonlinear path. First, the element is validated for geometrically non-linear analysis by solving two verification problems. Then, numerical results for different rotational boundary conditions are presented for two different stacking sequences, and thickness values. The numerical results presented show that there is no significant difference between the tangentially unrestrained and restrained clamped panels when only one edge is tangentially unrestrained. However, it is observed that the simply supported panels demonstrate a much less stiff behavior when one of the straight edges is tangentially unrestrained.

Keywords

• Laminated composite
• Panel
• Post-Buckling
• Tangential edge Rrstraints

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