304L PASLANMAZ ÇELİĞİN ŞEKİLLENDİRME SINIR DİYAGRAMININ BELİRLENMESİNDE ANİZOTROPİ BELİRLEME METODUNUN ETKİSİ

Son yıllarda birçok araştırmacı sac malzemelerin şekillendirme sınırlarının deneysel ve nümerik olarak belirlenmesi üzerine odaklanmışlardır. Deneysel çalışmalar esnasında birçok zorluklarla karşılaşılmasından ötürü, birçok araştırmacı için malzemelerin şekillendirme karakteristiklerini çekme deneyi gibi basit deneylerden modellenerek elde edilmesi temel bir mesele haline gelmiştir. Literatürde geliştirilen birçok model sonucu kullanılan akma yüzey fonksiyonlarına ve malzemelerin anizotropik davranışlarını yansıtan model parametrelerine büyük ölçüde bağlı bulunmaktadır. Bu çalışma kapsamında BBC ailesi (BBC2000, 2003, 2005 ve 2008) akma yüzeyleri Marciniak-Kuczynski kararsızlık modeli ile 304L paslanmaz çeliğin şekillendirme sınır diyagramının oluşturulması noktasında kullanılmıştır. Modeller farklı anizotropi belirleme yöntemleri için değerlendirilmiş ve tahmin edilen sonuçlar deneysel sonuçlarla karşılaştırılmıştır.

Anahtar Kelimeler:

304L, şekillendirme sınır diyagramı, BBC ailesi, Marciniak–Kuczynski modeli

EFFECT OF ANISOTROPY DETERMINATION METHODS ON FORMING LIMIT CURVE PREDICTION OF 304L STAINLESS STEEL

In recent years, numerous researchers have focused on the determination of the formability limits of the sheet materials experimentally and numerically. Due to some troubles encountered during the experimental studies, the modeling of the formability characteristics of the materials via simple experiments like tensile tests is the main issue for the most researchers. In the literature, most of the developed model results strongly depend on yield functions used and their parameters which reflect the materials’ anisotropic behaviors. In this study, the capability of BBC family yield functions (BBC2000, 2003, 2005 and 2008) are investigated to construct the forming limit diagram of 304L stainless steel by using the Marciniak-Kuczynski instability model. The models are evaluated for different anisotropy determination approaches and the predicted results have been compared with the experimental forming limit diagram.

Keywords:

304L, forming limit diagram, BBC family, Marciniak-Kuczynski model,

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