Plastisite Modellerinde Pekleşme Etkisinin Sonlu Elemanlar Analizi İle Tespiti

Yıl 2020, Cilt: 11 Sayı: 1, 171 - 181, 27.03.2020

Emre Esener

https://doi.org/10.24012/dumf.479746

Öz

Malzemelerin deformasyonu sırasında akma davranışının gelişim göstermesi pekleşme davranışı olarak adlandırılır. Malzemelerin plastik davranışını temsil eden plastisite modelleri sonlu elemanlar analizlerine malzeme modelleri olarak entegre edilmişlerdir. Her malzeme modeli kendi bünyesinde farklı kabuller barındırır. Pekleşme açısından plastisite modelleri değerlendirildiğinde temelde izotropik pekleşme ve kinematik pekleşme kabullerini yapan iki temel grup ortaya çıkmaktadır. Bu çalışmada sac metal şekillendirme işlemlerinden bir panel çekme prosesi temel alınarak plastisite modellerinde pekleşme etkisinin sonlu elemanlar analizleri ile değerlendirilmesi gerçekleştirilmiştir. Bu amaçla 4 farklı malzeme, izotropik ve kinematik pekleşme kabullerine sahip farklı plastisite modelleri ile modellenmiş ve pekleşme etkisinin gerilme, plastik gerinim ve şekillendirilebilirlik üzerine etkileri incelenmiştir. 

Anahtar Kelimeler

Sac metal şekillendirme, Pekleşme, Sonlu elemanlar analizi, Plastisite Modelleme

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