Boruların Çift Geçişli Paralel Tüp Kanal Açısal Presleme (DP- PTCAP) Yöntemi ile Aşırı Plastik Deformasyon Analizi

Year 2020, Volume: 32 Issue: 2, 313 - 324, 24.09.2020

Vedat Taşdemir

https://doi.org/10.35234/fumbd.645570

Abstract

Aşırı plastik deformasyon (APD), nano yapılı ve ultra ince taneli malzemeler elde edilmesi amacı ile kullanılan bir yöntemdir. Tüp şeklindeki malzemelerin aşırı plastik deformasyonunda kullanılan birçok yöntem vardır. Bu yöntemlerden biri de paralel tüp kanal açısal presleme (PTCAP) yöntemidir. Bu çalışmada, boru şeklindeki parçaların deformasyonu çift geçişli paralel tüp kanal açısal presleme (DP-PTCAP) metodu kullanılarak araştırılmıştır. Analizlerde, 5 farklı kanal açısı, 4 farklı kesit genişleme oranı ve 4 farklı boyutsuz uzunluk kullanılmıştır. Bu parametrelerin elde edilen tüp (boru) şeklindeki parçaların gerilme, birim şekil değişimi ve şekillendirme kuvvetine etkileri sonlu elemanlar yöntemi ile analiz edilmiştir. Çalışmada AA6061 malzeme kullanılmıştır. Analizler sonucunda, kanal açısının artması ile efektif birim şekil değişimi, şekillendirme kuvveti ve malzemede oluşan gerilmenin azaldığı görülmüştür. Çift geçişli kalıplarla elde edilen malzemelerin birim şekil değişiminin tek geçişli kalıplara nazaran daha yüksek olduğu belirlenmiştir. Yapılan çalışma sonucu analizlerden elde edilen birim şekil değişimine bakarak çift geçişli kalıplar ile elde edilen malzemelerin tane yapısının tek geçişli kalıplara nazaran daha ince taneli olduğu söylenebilir.

Keywords

Aşırı plastik deformasyon;, paralel tüp kanal açısal presleme, çift geçiş, sonlu elemanlar analizi, PTCAP

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