Düzlemsel Olmayan Çatlak İlerleme Problemlerinin Üç Boyutlu Analizi

Year 2017, Volume: 5 Issue: 2, 159 - 175, 25.06.2017

Oğuzhan Demir Ali Osman Ayhan

Abstract

Enerji, Savunma, Havacılık ve Uzay teknolojileri, ülkeler için kritik öneme sahip olup, bilim ve teknoloji düzeyinin gelişmesinde öncü rol oynayan alanların başında gelmektedir. Ar-Ge ve
yatırım maliyetlerinin yüksek olduğu bu alanlarda, kullanılan ekipmanlar da hem mali açıdan hem de malzeme güvenilirliği açısından büyük önem kazanmaktadır. Malzemelerde oluşabilecek hasarları en aza indirebilmek ve çatlak içeren yapıların emniyetli çalışabilmesini sağlamak için son yıllarda kırılma mekaniği alanında yapılan çalışmalar ağırlık kazanmıştır. Tasarım aşamasından başlayarak hasar/çatlak toleransları ve ömürleri tahmin edilerek iyileştirme çalışmaları gerçekleştirilmektedir.
Bu çalışmada, çatlaklı yapıların mod-I kırılma tokluğunu (KIC) belirlemede kullanılan standart CT (compact tension) numunesine eğik çatlak yerleştirilerek mod-I dış yüklemesi altında çatlağın üç boyutlu modelleme ve çatlak ilerleme simülasyonları gerçekleştirilmiştir. Kırılma ve çatlak ilerleme analizleri FCPAS (Fracture and Crack Propagation Analysis System) programı ile gerçekleştirilmiştir. Bu çalışma, FCPAS ile üç boyutlu karışık modlu çatlak ilerleme olgusunun modellenmesinin ilk adımını oluşturmaktadır.  

Keywords

Sonlu Elemanlar Yöntemi, Çatlak İlerleme Analizi, Karışık Mod-I/III, Düzlemsel Olmayan Çatlak İlerlemesi

Supporting Institution

Türkiye Bilimsel ve Teknolojik Araştırma Kurumu’na (TÜBİTAK)

Project Number

113M407

Thanks

Bu çalışmayı, 113M407 no.lu proje kapsamında finansal olarak destekleyen, Türkiye Bilimsel ve Teknolojik Araştırma Kurumu’na (TÜBİTAK) teşekkür ederiz.

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