Influences of out-of-plane fiber waviness on the curved beam strength of glass fiber composite laminates

Year 2020, Volume: 26 Issue: 1, 99 - 105, 20.02.2020

Kenan Çınar

Abstract

In-plane and out-of-plane waviness are inevitable defects in parts that have curved sections made of continuous fiber-reinforced composites. These defects can be located in the micro, meso (ply level) and macro-scale (part level). In this study, an artificial out-of-plane fiber waviness was generated on the outer surface of the curved section of the L-shaped laminates. The fiber waviness generated was characterized experimentally using micrographs taken from the samples. The effect of fiber waviness on curved beam strength and delamination of the samples were determined through bending tests. Also, the effect of fiber waviness on the strain distribution on the curved section was quantified using Digital Image Correlation (DIC) technique.

Keywords

Fiber waviness, Digital image correlation (DIC), Defects, Bending testing, Glass fibers

Düzlem dışı fiber dalgalanmasının cam elyaf takviyeli tabakalı kompozitlerin kavisli kiriş dayanımı üzerindeki etkileri

Abstract

Düzlem içi ve düzlem dışı dalgalanma, sürekli fiber takviyeli kompozitlerden yapılmış kavisli bölgelere sahip parçalarda kaçınılmaz kusurlardır. Bu kusurlar mikro, mezo (katman seviyesi) ve makro ölçekli (parça seviyesi) olabilir. Bu çalışmada, L şekilli laminatların kavisli bölümünün dış yüzeyinde yapay bir düzlem dışı fiber dalgası oluşturulmuştur. Elde edilen fiber dalgalanmaları, numunelerden alınan mikrogörüntüler kullanılarak deneysel olarak karakterize edilmiştir. Fiber dalgalanmaların kavisli kiriş mukavemeti ve numunelerin delaminasyonuna etkisi eğme testleri ile belirlenmiştir. Ayrıca, fiber dalgalanmasının eğri kesitteki birim şekil değiştirme dağılımına etkisi Sayısal Görüntü Korelasyonu (SGK) tekniği kullanılarak ölçülmüştür.

Keywords

Fiber dalgalanması, Sayısal görüntü Korelasyonu (SGK), Kusurlar, Eğilme testi, Cam fiberler

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