Prediction of screw withdrawal resistance for plywood laminated panels and sandwich panels

Year 2024, , 81 - 88, 30.03.2024

Mesut Uysal , Ergün Güntekin

https://doi.org/10.18182/tjf.1375273

Abstract

Sandwich panels are favorable materials for structural or non-structural components due to durability, lightness, and longevity in service life. This study aimed to predict screw withdrawal resistance of the plywood laminated medium-density fiberboard and particleboard, and sandwich panels. In predicting the screw withdrawal resistance, withdrawal load capacity, density, and withdrawal stiffness of the materials in each layer, screw penetration depth, and screw diameter were considered. Moreover, the screw withdrawal strength of the panels was examined. Screw withdrawal tests of panels were conducted according to TS EN 13446 standard. The test results showed a proportional correlation between the density and screw withdrawal strength of the panels. The highest screw withdrawal strength was obtained for sandwich panels made of plywood and medium-density fiberboard (12.51 MPa). Furthermore, the difference between experimental and predicted screw withdrawal resistance changed from 0.20% to 24.86%. Besides, there was no statistically significant difference between the screw withdrawal strength of the top and bottom face-laminated panels. The test results showed that both face laminated panels (sandwich panels) had higher screw withdrawal strength, density, and experimental and predicted screw withdrawal resistance compared to one face laminated panels.

Keywords

Screw withdrawal resistance, Screw withdrawal strength, Sandwich panels, Plywood, Medium-density fiberboard, Particleboard

Kontrplak ile lamine edilmiş panel ve sandviç panellerin vida tutma direncinin tahmin edilmesi

Abstract

Sandviç paneller dayanıklılığı, hafifliği ve servis hayatının uzun olması nedeniyle yapısal veya yapısal olmayan elemanlar için uygun malzemelerdir. Bu çalışmada, kontrplak ile lamine edilmiş MDF ve yonga levha panelleri ile sandviç panellerin vida tutma kapasiteleri tahmin edilmiştir. Bu malzemelerin vida tutma kapasiteleri tahmin edilirken, panellerin her bir katmanında bulunan kontrplak, MDF ve yonga levha malzemelerinin vida tutma kapasiteleri, yoğunluğu ve vida çekme rijitliği ile vida penetrasyon derinliği ve vida çapı dikkate alınmıştır. Ayrıca, panellerin vida tutma dayanımları da belirlenmiştir. Tüm testler TS EN 13446 standardına göre yapılmıştır. Deney sonuçları panellerin vida tutma dayanımları ve yoğunluğu arasında doğrusal bir ilişki olduğunu göstermiştir. Vida tutma dayanımı en yüksek olan panel kontrplak ve MDF kullanılarak hazırlanan sandviç panellerde elde edilmiştir (12,51 MPa). Çalışma sonuçlarına göre malzemelerin deneysel ve tahmin edilen vida çekme kapasiteleri arasındaki fark %0,20 ile %24,86 arasında değişmektedir. Bununla birlikte alt veya üst yüzü lamine edilmiş panellerin vida tutma dayanımları arasında istatiksel olarak bir farklılık olmadığı gözlemlenmiştir. Çalışma sonuçları, sandviç panellerin tek yüzü lamine edilmiş panellere göre daha yüksek vida tutma dayanımı ve yoğunluğu göstermektedir. Ayrıca, sandviç paneller için hem deneysel hem de tahmin edilen vida çekme kapasiteleri de tez yüzü lamine edilmiş panellerden daha yüksektir.

Keywords

Vida çekme kapasitesi, Vida çekme dayanımı, Sandviç paneller, Kontrplak, MDF, Yonga levha

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