Çimento esaslı lifli kompozitlerin dijital görüntü korelasyonu yöntemi ile çoklu çatlak davranışının incelenmesi

Year 2019, Volume: 34 Issue: 1, 479 - 494, 26.03.2019

Tarık Yıldırım , Kamile Tosun Felekoğlu , Eren Gödek , Muhammer Keskinateş Burak Felekoğlu , Okan Önal

https://doi.org/10.17341/gazimmfd.416508

Cited By: 2

Abstract

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.

Keywords

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

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