ÇİMENTO ESASLI LİFLİ KOMPOZİTLERİN DİJİTAL GÖRÜNTÜ KORELASYONU YÖNTEMİ İLE ÇOKLU ÇATLAK DAVRANIŞININ İNCELENMESİ

TARIK YILDIRIM, KAMİLE TOSUN FELEKOĞLU, EREN GÖDEK, MUHAMMER KESKİNATEŞ, BURAK FELEKOĞLU, OKAN ÖNAL
223 28

Öz


Dijital görüntü korelasyonu (DIC), matematik tabanlı temassız bir deformasyon ölçüm tekniğidir. Klasik deformasyon ölçüm yöntemlerine kıyasla sağladığı avantajlar (alansal deformasyon ölçümü, temassız ölçüm, deney sonrası analize imkân tanıması vb.) sayesinde DIC’nin mühendislik alanında kullanımı giderek artmaktadır. Mühendislik özellikleri geliştirilmiş çimentolu kompozitler (ECC) geleneksel lifli kompozitlerden farklı olarak kararlı çoklu çatlama davranışı göstermektedir. ECC’nin gösterdiği bu kararlı çoklu çatlama davranışının analizi, kompozitin mekanik ve durabilite performansının değerlendirilmesi açısından oldukça önemlidir. ECC üzerinde yapılan çalışmalar her geçen gün artmaktadır. Bu çalışmada, DIC’nin mühendislik malzemelerinin deformasyon ölçümlerindeki mevcut kullanım alanları detaylı bir literatür araştırması şeklinde sunulmuştur. Son yıllarda ECC’nin çoklu çatlak davranışının analizi ile ilgili yapılan çalışmalar taranmış, ayrıca DIC yönteminin bu amaçla kullanılabilirliği deneysel olarak incelenmiştir. Bu kapsamda hacimce %2 oranında yüksek çekme dayanımlı polipropilen lif (HTPP) kullanılarak kemik şeklinde çekme numunesi formundaki HTPP-ECC’ler üretilmiştir. Üretilen kompozitlere tek eksenli çekme deneyleri uygulanmış ve kompozit deformasyonları çekme örneği etrafına yerleştirilen 4 adet geleneksel deformasyon ölçer (LVDT) ve DIC tabanlı bir kamera sistemiyle kaydedilmiştir. LVDT ve DIC yöntemleri ile elde edilen bulgular kıyaslanarak, DIC tekniğinin kompozitlerin çoklu çatlama davranışının incelenmesinde kullanılabilirliği araştırılmıştır. Elde edilen bulgular değerlendirildiğinde, DIC’nin çoklu çatlak davranışı gösteren kompozitlerde deformasyon takibi açısından oldukça yakın sonuçlar verdiği tespit edilmiştir. Ayrıca, çatlak analizi için DIC metodunun geleneksel yöntemlerden üstün yanları ortaya koyulmuştur.


Anahtar kelimeler


Mühendislik özellikleri geliştirilmiş çimento esaslı kompozitler; dijital görüntü korelasyonu; ECC; DIC; çoklu çatlak davranışı

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