THREE DIMENSIONAL FINITE ELEMENT ANALYSIS OF COMPRESSION BEHAVIOR OF ORIENTAL BEECH

Abstract

- Finite Element Method (FEM), is a numeric method which is used to analyze material or systems behavior to external factors. In this study, three dimensional (3D) finite element analyses (FEA) of oriental beech woods’ compression behavior was performed. Defect free compression samples, which were simulated, were prepared 20*20*60mm of sizes through longitudinal (L), radial (R) and tangential (T) directions. All the samples were conditioned at 20ºC and 65%RH using conditioning chamber. Compression tests (CT), were performed using Universal Test Machine (UTM) and stress and deformations curves were obtained by bi-axial extensometer. FEA of compression models were performed using 3D orthotropic material properties. Load deformation curves were obtained using deformation values of FE Models and then these were matched against the curves obtained by CT. As a result, it is concluded that created 3D FE Models showed real-like behavior values.

Keywords

• Oriental beech,finite element analysis,compression

DOĞU KAYINI ODUNU BASMA DAVRANIŞININ ÜÇ BOYUTLU SONLU ELEMANLAR ANALIZI

Öz

Sonlu Elemanlar Metodu malzeme ve sistemlerin dış etkenlere karşı davranışlarının analizinde kullanılan nümerik bir yöntemdir. Bu çalışmada doğu kayını (Fagus orientalis L.) odununun basma davranışının üç boyutlu sonlu elemanlar analizi yapılmıştır. Simülasyonu gerçekleştirilen basma örnekleri 20x20x60mm ölçülerde lif, radyal ve teğet yönlerde hazırlanmıştır. Deney örnekleri hazırlanırken düzgün lifli, budaksız ve kusursuz olmasına dikkat edilmiştir. Deney önekleri 20 sıcaklık ve %65 bağıl nem seviyesinde kondisyonlanmıştır. Basma testleri universal test cihazında gerçekleştirilmiş ve bi-aksiyal ekstensometre kullanılarak gerilme deformasyon eğrileri elde edilmiştir. Basma modellerinin sonlu elemanlar analizi üç boyutlu ortotropik malzeme parametreleri kullanılarak gerçekleştirilmiştir. Sonlu elemanlar modellerinden elde edilen deformasyon miktarları ile yük deformasyon eğrileri elde edilmiş ve basma testlerinden elde edilen eğrilerle karşılaştırılmıştır. Oluşturulan üç boyutlu sonlu elemanlar modellerinin gerçek davranışa yakın değerler verdiği ortaya koyulmuştur

Anahtar Kelimeler

• Doğu kayını,Sonlu Elemanlar Analizi (SEA),basma

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