Experimental and Theoretical Study on Behaviour of Geometrically Asymmetric Composite Marine Sandwich Beams under Bending Load

Abstract

This study presents a detailed investigation on the three-point and four-point bending behaviour of asymmetric sandwich beams composed of polyvinyl chloride (PVC) foam core and E-glass fibre reinforced polymer face sheets. The effects of mid-plane asymmetry on the bending load-displacement behaviour and failure mechanism of the sandwich beams were examined. Simple analytical expressions accounting for flexural and shear rigidities of the sandwich beams were proposed to predict the failure load, mid-span deflection and equivalent bending stiffness of the specimens and validated against experimental results. By shifting the loading direction, the flexural behaviour of asymmetric beams may be controlled. On the loading side, the use of face sheet with thick or high in-plane mechanical characteristics resulted in a delay in compressive failure of the top face sheet. The effective bending stiffness was overestimated since the applied formula did not account for shear deformations. First-order shear deformation theory was used to estimate the mid-span displacement values of sandwich beams in elastic regime and showed good agreement with the experimental results.

Keywords

• Asymmetric sandwich beams
• Flexural properties
• PVC foam

Geometrik Olarak Asimetrik Kompozit Sandviç Kirişlerin Eğilme Yükü Altındaki Davranışı Üzerine Deneysel ve Teorik Çalışma

Abstract

Bu çalışma, polivinil klorür (PVC) köpük çekirdek ve E-cam elyaf takviyeli polimer tabakalardan oluşan asimetrik sandviç kirişlerin üç nokta ve dört nokta eğilme davranışları hakkında ayrıntılı bir araştırma sunmaktadır. Sandviç kirişlerin eğilme yükü-sehim davranışı ve hasar mekanizması üzerindeki orta düzlem asimetrisinin etkileri incelenmiştir. Sandviç kirişlerin eğilme ve kayma rijitlik değerlerini hesaba katan basit analitik ifadeler, numunelerin hasar yükünü, kiriş orta-nokta sehmini ve eşdeğer eğilme rijitliğini tahmin etmek için önerilmiş ve deneysel sonuçlar ile doğrulanmıştır. Yükleme yönünü değiştirerek, asimetrik kirişlerin eğilme davranışı kontrol edilebilir. Yükleme tarafında, kalın veya yüksek düzlem içi mekanik özelliklere sahip yüzey tabakasının kullanılması, üst yüzey tabakasında basma hasarı gecikmesine neden olmuştur. Uygulanan formül kayma deformasyonlarını hesaba katmadığı için etkin eğilme rijitliği değerleri yüksek tahmin edilmiştir. Birinci mertebe kayma deformasyon teorisi, elastik bölgede sandviç kirişlerin orta açıklık deplasman değerlerinin tahmin etmek için kullanılmış ve deneysel sonuçlarla iyi bir uyum göstermiştir.

Keywords

• Asimetrik sandviç kirişler
• Eğilme özellikleri
• PVC köpük

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