Kürlenme Süresinin Sıcak Preslenmiş GFRP Kompozitlerin Çekme Ve Eğilme Performansı Üzerine Etkisi

Yıl 2025, Cilt: 12 Sayı: 27, 507 - 519, 24.12.2025

Yalın Yamaç , Çağrı Uzay

https://doi.org/10.54365/adyumbd.1778323

Öz

Bu çalışmada, cam elyaf takviyeli polimer (GFRP) kompozitler, 80 °C sıcaklıkta ve 4 bar basınçta üç farklı kürleme süresi (2 saat, 4 saat ve 6 saat) boyunca sıcak presleme ile üretilmiştir. Laminatların elyaf hacim oranı (Vf), kürleme süresinden bağımsız olarak yaklaşık %63 olmuştur, bu da sabit basınç altında stabil konsolidasyonu doğrulamaktadır. Mekanik karakterizasyon, çekme ve üç noktalı eğme testleri ile gerçekleştirilmiş ve kırılma yüzeyleri stereomikroskopi kullanılarak analiz edilmiştir. 4 saat kürlenen kompozitler, 2 saatlik kürlemeye göre %12.84 ve %41.71'lik bir iyileşmeye karşılık gelen çekme (669.91 MPa) ve eğme mukavemeti (620.34 MPa) değerleri sergilemiştir. Fraktografik gözlemler, 4 saatlik ve 6 saatlik numunelerde baskın hasar mekanizmasının lif kırılması olduğunu ortaya koyarken, 2 saatlik numunelerde yetersiz çapraz bağlanma ile ilişkili lif çekilmesi, delaminasyon ve kesme kırılmaları gözlemlenmiştir. Bu bulgular, sıcak preslemenin etkili bir konsolidasyon sağladığını ve GFRP kompozitlerin mekanik performansını önemli ölçüde artırdığını göstermektedir. Geleneksel kompozit üretim teknikleriyle karşılaştırıldığında, sıcak preslemenin önemli ölçüde daha hızlı olduğu, daha kısa sürede verimli kürleme sağladığı ve bu işlemi epoksi polimer matrisli kompozitlerin seri üretimi için son derece uygun hale getirdiği görülmüştür. Çalışma, mukavemet, tokluk ve yapısal bütünlük arasında bir denge sağlayan 4 saatlik kürleme süresinin en etkili süre olduğunu vurgulamaktadır.

Anahtar Kelimeler

Cam elyaf , Epoksi reçine , Sıcak presleme , Mekanik özellikler , Kürlenme süresi

Effect Of Curing Time On The Tensile And Flexural Performance of Hot-Pressed GFRP Composites

Öz

In this study, glass fiber reinforced polymer (GFRP) composites were fabricated by hot-pressing at 80 °C and 4-bar pressure for three different curing durations (2 h, 4 h, and 6 h). The fiber volume fraction (Vf) of the laminates was approximately 63%, regardless of curing time, confirming stable consolidation under constant pressure. Mechanical characterization was conducted through tensile and three-point bending tests, and the fracture surfaces were analyzed using stereomicroscopy. The 4-hour cured composites exhibited superior tensile (669.91 MPa) and flexural strength (620.34 MPa) values corresponding to a 12.84% and 41.71% improvement over 2 h curing. Fractographic observations revealed fiber fracture as the dominant failure mechanism in 4 h and 6 h samples, whereas the 2 h samples displayed fiber pullout, delamination, and shear fractures associated with insufficient crosslinking. These findings demonstrate that hot pressing provides effective consolidation and significantly enhances the mechanical performance of GFRP composites. Compared with conventional composite manufacturing techniques, hot pressing was found to be significantly faster, ensuring efficient curing in shorter durations and making the process highly suitable for mass production of epoxy polymer matrix composites. The study highlights 4-hour curing as the most effective duration, offering a balance between strength, toughness, and structural integrity.

Anahtar Kelimeler

Glass fibre , Epoxy resin , Hot pressing , Mechanical properties , Curing time

Kaynakça

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