CTP kompozit plakaların çoklu cıvata bağlantı davranışlarının incelenmesi

Öz

Pultrüzyon ile üretilmiş cam fiber takviyeli polimer (CTP) esaslı kompozit plakaların bağlantı kapasitesi genellikle kompozit yapının tasarımında önemli bir faktör olarak kabul edilir. Bu çalışmada, farklı sıkma momentleri (M = 0–2–4 N.m), farklı delik sayıları (2–4–5) ve farklı E/D (2–3–4) oranları dikkate alınarak 0o ve 90o fiber yönelim açılarına sahip polimer matris esaslı cam fiber takviyeli kompozit plakaların cıvatalı bağlantı davranışları tartışılmıştır. Bağlantı cıvatalarına yeterli sıkma momenti uygulanması, numunelerin yük taşıma kapasitesini artırmaktadır. Ancak delik sayısının artışı, kesit kaybına neden olduğu için malzemenin mukavemetini olumsuz etkileyebilmektedir. Bu yüzden mühendislik uygulamalarında, optimum sıkma momenti ve delik düzenlemesi dikkatlice seçilmelidir. Çekme yükleri altında mekanik olarak sabitlenmiş tabakalı kompozitler genellikle, yatak (bearing) hasar modu, kesme (shear-out) hasar modu ve yırtılma (net-tension) hasar modu olarak üç temel mod şeklinde hasarlanırlar. 0o fiber yönelim açılarına sahip numunelerde bu üç hasar modu oluşurken 90o fiber yönelim açılı numunelerde ise yatak/net-gerilim (bearing/net-tension) hasar modları belirgin şekilde gerçekleşmiştir.

Anahtar Kelimeler

• Pultrüzyon ile üretilmiş cam fiber takviyeli polimer (CTP)
• çoklu cıvata bağlantısı
• delik
• hasar modları

Investigation of multi-bolted connection behaviors of GFRP composite plates

Abstract

The connection capacity of pultruded glass fiber reinforced polymer based composite plates is generally considered as an important factor in the design of composite structures. In this study, the bolt connection behaviors of polymer matrix based glass fiber reinforced composite plates with 0o and 90o fiber orientation angles were discussed by considering different tightening torques (M = 0–2–4 N.m), different hole numbers (2–4–5) and different E/D (2–3–4) ratios. Applying sufficient tightening torque to the connection bolts increases the load carrying capacity of the samples. However, increasing the number of holes may negatively affect the strength of the material since it causes cross-section loss. Therefore, in engineering applications, the optimum tightening torque and hole arrangement should be carefully selected. Mechanically restrained laminated composites under tensile loads generally fail in three basic modes as bearing, shear-out and net-tension damage modes. While these three damage modes occurred in samples with 0o fiber orientation angles, bearing/net-tension damage modes occurred significantly in samples with 90o fiber orientation angles.

Keywords

• Glass fiber reinforced polymer (GFRP) produced by pultrusion
• multiple bolt joint
• hole
• damage modes

Kaynakça

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