Çevrimsel Malzeme Deformasyonlarının Modellenmesi Bölüm I Plastisite Bünye Modelleri

Yıl 2004, Cilt: 6 Sayı: 1, 1 - 11, 02.05.2004

Mehmet Fırat

Öz

Makina parçaları ve yapı
elemanların tasarımında; temel mühendislik faaliyetleri, statik ve dinamik
yüklemeler altında oluşan gerilme ve gerinimlerin hesaplanması, ve belli bir
güvenlik kriterine göre malzeme seçiminden geometrik ölçümlendirmeye kadar olan
bir dizi tasarım kararının alınması olarak ifade edilebilir. Gerek bilgisayar
ortamında değişik sayısal yöntemler kullanılarak yapılan değerlendirmeler ve
gerekse protiplendirme esnasında uygulanan değişik doğrulama testleri, yapısal
deformasyonların gerinim ve gerilme değerleriyle ilişkilendirme gereksinimi
mevcuttur. Bu amaçla yapılacak tüm mühendislik faaliyetleri değişen oranlarda
malzeme bünye modellerinin kullanılması ihtiyacını ortaya çıkarmaktadır. Bu
sebeple tasarım araçlarını kullanan mühendisler açısından malzeme modelleme
bilgisi giderek artan bir önem ifade etmektedir. Bu makalede, tipik mühendislik
metallerinin çok-eksenli çevrimsel dinamik yüklemeler altında
deformasyonlarının benzetimine yönelik literatürde önerilen bünye modelleri
incelenecektir. 

Anahtar Kelimeler

Çok Eksenli Çevrimsel Yükleme, Kinematik Peklesme, Plastik Bünye Denklemi

Kaynakça

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