M. Evren TOYGAR, Farshid Khosravi MALEKİ

Effects of Lay-Up Sequence and Widths on The SERR of Woven Glass Fiber Reinforced Polymer Composites

In this paper, fracture behavior of woven Glass Fiber Reinforced Polymer (GFRP) composites under Mode I crack growth was experimentally investigated and numerically modeled, to determine the effects of lay-up sequence and widths on delamination resistance. Different methods are used for calculation of strain energy release rate (SERR): for the experimental solution, experimental compliance calibration method (CCM), modified beam theory (MBT), modified compliance calibration (MCC) are used and virtual crack closure technique (VCCT) are used for the numerical solution. To achieve this aim DCB (double cantilever beam) test specimens are used to evaluate the SERR values. Three-dimensional finite element model is used to perform the delamination, crack analysis, and Mode I SERR value is calculated by the VCCT. It is seen that there is an agreement between experimental and numerical results so that the VCCT method is to be an appropriate method for analyzing a SERR value of woven glass fiber reinforced polymer composites.

Dokuma Cam Elyaf Takviyeli Polimer Kompozitlerin Tabaka Diziliminin ve Genişliklerinin SERR Üzerindeki Etkileri

Bu çalışmada, Mod I çatlak ilerlemesi altında dokuma cam elyaf takviyeli polimer (GFRP) kompozitlerinin kırılma davranışı deneysel olarak araştırılmış ve tabaka diziliminin ve numune genişliklerinin delaminasyon direncine olan etkilerini belirlemek için sayısal olarak modellenmiştir. Açığa çıkan şekil değiştirme enerjisinin (SERR) hesaplanması için farklı yöntemler kullanılmıştır: deneysel çözüm için, deneysel uyum kalibrasyon yöntemi (CCM), modifiye edilmiş kiriş teorisi (MBT), modifiye uyum kalibrasyon yöntemi (MCC) kullanılmıştır ve sayısal çözüm için sanal çatlak kapatma tekniği (VCCT) kullanılmıştır. DCB test numuneleri, SERR değerlerini elde etmek için kullanılmıştır. Delaminasyon, çatlak analizi ve Mod I SERR değerilerinin VCCT tarafından hesaplanması için üç boyutlu sonlu eleman modeli kullanılmıştır. Deneysel ve sayısal sonuçların birbiriyle uyumlu olduğu ve böylece bir dokuma cam elyaf takviyeli polimer kompozitlerin SERR değerini analiz etmek için VCCT metodunun uygun bir yöntem olduğu görülmüştür.

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