Yapıştırma ile Oluşturulmuş Al-Çe Katmanlı Sacların Dizilime Bağlı Olarak Mekanik Özelliklerinin Belirlenmesi

Katmanlı saclar iki veya daha fazla metalin farklı yöntemler ile birleştirilmesi ile oluşturulan kompozit yapılardır. Sac metaller haddeleme yöntemi ile üretildikleri için yöne bağlı olarak farklı mekanik özellikler gösterebilirler. Dolayısı ile bu sacların birleştirilmesi ile oluşturulan katmanlı sacların da dizilim yönlerine göre farklı özellik göstermesi beklenir. Bu çalışma kapsamında alüminyum ile çelik sacların birleştirilmesi ile oluşturulmuş katmanlı sacların mekanik özellikleri incelenmiştir. Çalışmada öncelikle tekil ve katmanlı sacların mekanik özellikleri çekme testi ile belirlenmiştir. Çekme testi sonucunda elde edilen akma gerilmesi, kopma dayanımı, uzama miktarı, pekleşme üsteli gibi farklı parametreler karşılaştırılmıştır. Ayrıca sacların anizotropi katsayıları belirlenerek derin çekme işlemlerinde oluşabilecek olan kulaklanma durumu hakkında yorum yapılmıştır. Çalışma sonucunda katmanlı sacların mekanik özelliklerinin kendisi oluşturan sacların mekanik özelliklerinin arasında olduğu belirlenmiştir. Ayrıca alüminyum sac üzerine hadde yönüne göre farklı dik, paralel ve diagonal şekilde çelik sac yapıştırılarak anizotropik özelliklerin minimize edilebileceği belirlenmiştir. Dolayısı ile derin çekme gibi sac metal şekillendirme işlemlerinde daha kısa kulak yükseklikleri elde etmek mümkün olmaktadır.

Anahtar Kelimeler:

Katmanlı sac, anizotropi, kulaklanma, derin çekme

Change of Mechanical Properties of Al-St Layered Sheets Formed by Adhesion Depending on Sheet Arrangement

Layered sheets are composite structures that combine two or more metals with different methods. Since sheet metals are produced by the rolling method, they can show different mechanical properties depending on the direction. Therefore, it is expected that the layered sheets formed by combining them will show different properties according to their arrangement directions. In this study, the mechanical properties of laminated sheets formed by combining aluminum and steel sheets were investigated. The mechanical properties of single and layered sheets were determined by the tensile test. Different parameters such as yield stress, tensile strength, elongation, and hardening exponent were compared as a result of the tensile test. In addition, anisotropy coefficients of the sheets were determined, and comments were made about the earing situation that may occur in deep drawing processes. As a result of the study, it was determined that the mechanical properties of the layered sheets are between the mechanical properties of the sheets that form them. In addition, it has been determined that anisotropic properties can be minimized by bonding steel sheets in different alignments on the aluminium sheet according to the rolling direction. Therefore, obtaining shorter ear heights in sheet metal forming processes such as deep drawing will be possible.

Keywords:

Layered sheet, anisotropy, earing, deep drawing,

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