Impact test performance of marine sandwich composites with grooved-PVC foam

Abstract

In this study, charpy impact test results of marine sandwich composites have been reported. Impact tests have been conducted on the sandwich samples with two different stacking sequences. The amount of absorbed energy has been determined after repeated-impact and impact tests. Impact loads were applied to both sides of sandwich samples. The performance of the repeated-impacted sandwich samples with [± 45] intermediate layers was higher than samples having only plain [0/90] plies. Samples with cross-grooved PVC foam have failed at high impact energy values compared to samples with plain PVC foam. Following the repeated-impact tests, it has been observed that the amount of absorbed energy has decreased linearly. Using cross-grooved PVC foam has led to an increase in the impact performance due to resin columns supporting the sandwich structure. The impact loads applied at different energy levels caused different damage modes have been reported.

Keywords

• Sandwich composite,charpy impact test,PVC,damage modes

Oluklu PVC köpük içeren denizel sandviç kompozitlerin darbe test performansları

Abstract

Bu çalışmada, denizel sandviç kompozitlerin charpy deney test sonuçlarına yer verilmiştir. Darbe testleri farklı iki laminasyon planına sahip denizel sandviç kompozit numunelere uygulanmıştır. Ön darbe ve ön darbesiz testler neticesinde sandviç numunelerin absorbe ettikleri enerji miktarları belirlenmiştir. Darbe yükleri numunelerin borda içi (ince) ve borda dışı (kalın) taraflarına uygulanmıştır. ±45 elyaf ara tabaka içeren sandviç numunelerin darbe performansları, sadece 0/90 elyaf içeren numunelere kıyasla ön darbeli testlerde yüksek çıkmıştır. Oluklu PVC köpük içeren numuneler, düz PVC içerenlere kıyasla yüksek darbe enerjisi değerlerinde hasara uğramıştır. Ön darbe testleri sonrasında absorbe edilen enerji miktarlarının lineer olarak azaldığı gözlenmiştir. Oluklu PVC içeren sandviç numunelerde reçine sütunlar yapıya destek olarak darbe performanslarının artışını sağlamıştır. Farklı enerji seviyelerinde uygulanan darbe yükleri sonucu oluşan farklı hasar durumları rapor edilmiştir.

Keywords

• Sandviç kompozit,charpy darbe testi,PVC,hasar tipleri

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