Strain Analysis of Multiple Cracking Fiber Reinforced Composites by Digital Image Correlation: Evaluation of Parameter Effects

Öz

In this study, strain of fiber reinforced composites exhibiting multiple cracking under tensile load was compared by using traditional deformation meter (LVDT-Linear Variable Differential Transformer) and digital image correlation (DIC) method. In the DIC method, analyzes were performed by taking the influence of light (presence of controlled illumination), image resolution, subset size and step size parameters and two different methods of correlation into account. If appropriate subset size is selected, the strain values obtained by DIC analysis corresponded to the values obtained from LVDTs when images are taken under controlled lighting and high resolution conditions.

Anahtar Kelimeler

• Digital image correlation,illumination,resolution,subset,step size,correlation methods

Çoklu Çatlayan Lifli Kompozitlerin Birim Deformasyonunun Dijital Görüntü Korelasyonu ile Analizi: Parametre Etkilerinin Değerlendirilmesi

Öz

Bu çalışmada çekme yüklemesi altında çoklu çatlak davranışı sergileyen lifli kompozitlerin birim deformasyonları geleneksel deformasyon ölçer (LVDT) ve dijital görüntü korelasyonu (DIC) yöntemiyle incelenerek kıyaslanmıştır. DIC yönteminde ışık etkisi (kontrollü aydınlatma varlığı), görüntü çözünürlüğü, alt küme boyutu ve adım aralığı parametreleri ile iki farklı korelasyon yöntemi dikkate alınarak analizler gerçekleştirilmiştir. Uygun alt küme boyutunun seçilmesi ve görüntülerin kontrollü aydınlatma ile yüksek çözünürlük koşullarında alınması durumunda, DIC analizi sonucu elde edilen birim deformasyon değerleri, LVDT’lerden elde edilen değerler ile örtüşmektedir. 

Anahtar Kelimeler

• Dijital görüntü korelasyonu,aydınlatma,çözünürlük,alt küme,analiz adım aralığı,korelasyon yöntemleri

Kaynakça

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