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

Yıl 2016, Cilt: 18 Sayı: 2, 104 - 115, 21.12.2016

Fatih Balıkoğlu , T. Kerem Demircioğlu , Mustafa Yıldız , Nurettin Arslan

Öz

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.

Anahtar Kelimeler

Sandwich composite, charpy impact test, PVC, damage modes

Oluklu PVC köpük içeren denizel sandviç kompozitlerin darbe test performansları

Öz

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.

Anahtar Kelimeler

Sandviç kompozit, charpy darbe testi, PVC, hasar tipleri

Kaynakça

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