Effect of subset size and analysis step interval on strain and multiple crack characterization using digital image correlation

Abstract

Within the scope of this article, the unit strain, crack number, and crack width properties of engineered cementitious composites were calculated both by conventional measurement method and by digital image correlation (DIC) analysis using different subset size and analysis step intervals values. In the analysis, the variation of the results obtained by using seven different subset sizes and seven different analysis step intervals was examined comparatively. In conclusion, it was determined that while the analysis step intervals did not have a significant effect on the accumulated error and strain capacity values, closer values were obtained with conventional measurements as the subset size increased. However, when both subset size and analysis step spacing parameters are selected at relatively low levels, the crack number and crack width calculated via DIC have more accurate results compared to the calculation method applied from the literature, and it is more reliable than existing methods with the supporting visual content provided by DIC.

Keywords

• DIC
• ECC
• subset size
• analysis step size

Dijital görüntü korelasyonu ile şekil değiştirme ve çoklu çatlak karakterizasyonuna alt küme boyutunun ve analiz adım aralığının etkisi

Öz

Bu makale kapsamında, mühendislik uygulanmış çimento esaslı kompozitlerin birim şekil değiştirme, çatlak sayısı ve çatlak genişliği özellikleri hem geleneksel ölçüm yöntemiyle hem de farklı alt küme ve adım aralığı değerleri kullanılarak dijital görüntü korelasyonu (DIC) analizleri aracılığıyla hesaplanmıştır. Analizlerde, yedi farklı alt küme boyutu ve yedi farklı analiz adım aralığı boyutu kullanılarak elde edilen sonuçların değişimi kıyaslamalı olarak incelenmiştir. Sonuç olarak, adım boyutunun birikmiş hata ve gerinim kapasitesi değerleri üzerinde anlamlı bir etkisinin olmadığı, alt küme boyutu arttıkça geleneksel ölçümlerle daha yakın değerler elde edildiği tespit edilmiştir. Ancak, hem alt küme boyutu hem de analiz adım aralığı parametreleri göreceli olarak düşük seviyelerde seçildiğinde, DIC aracılığıyla hesaplanan çatlak sayısı ve çatlak genişliğinin literatürden alınarak uygulanan hesap yöntemine kıyasla daha doğru sonuçlar içerdiği ve DIC’nin sağladığı destekleyici görsel içeriklerle mevcut yöntemlere kıyasla daha güvenilir olduğu belirlenmiştir.

Anahtar Kelimeler

• DIC
• ECC
• alt küme boyutu
• analiz adım aralığı

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