Kastamonu University Journal of Forestry Faculty 1303-2399 1309-4181 Kastamonu University 10.17475/kastorman.626277 Oturma Amaçlı Farklı Özellikteki Poliüretan Süngerlerin Sürekli- Yorulma Performansları Constant-Fatigue Performance of Different Polyurethane Foams for Sitting Purposes Demirel Samet Ergun Tuna Busra 09 30 2019 19 2 225 234 10 05 2018 06 14 2019 Copyright © 2001, Kastamonu University Journal of Forestry Faculty 2001 Kastamonu University Journal of Forestry Faculty

Çalışmanın amacı: Bu çalışmanın amacı, Trabzon / Türkiye'de üretilen altı farklı yoğunluktave iki farklı kategoride olan poliüretan süngerlere uygulanan sürekli yorulmayüklemesi sonrası IFD sertlik ve kalınlık değerlerinde meydana gelendeğişimleri incelemektir.Materyal ve Metod: ASTM D3574 standardı baz alınarak süngerler ilk olarak IFD sertlik testine ve sürekli-yorulma testlerine tabitutulmuştur. Daha sonra, süngerlerin sürekli yükleme sonrası nihai IFD sertlikdeğerleri ölçülmüştür. Süngerlerin IFD sertlik değerlerindeki değişimler raporedilmiştir.Sonuçlar: Normal kategorideki süngerlerin yoğunluğununarttırılması sünger sertliğini gösteren IFD kayıp oranını azalmasına sebepolmuştur. Ancak, bu durum yumuşak kategorideki süngerler için tam tersidir.Bununla birlikte, normal süngerlerin destek faktörü değerleri, sürekli-yorulmayüklemesinden sonra yoğunluk arttıkça artmış, yumusak süngerler için yoğunluk arttıkçaazalmıştır. Bu çalışmada kullanılan tüm süngerler, sürekli-yorulmayüklemesinden sonra, % 10'dan daha az bir kalınlık kaybı göstermiş olup,süngerlerin görünüşlerinde görsel bir bozulma tespit edilmemiştir.Önemli vurgular: Koltuk üretiminde yumuşak bir sünger kullanılacağı zaman, sürekli yorulmayüklemesi altında yumuşak süngerlerin normal süngerlere göre teknik olaraktamamen zıt bir davranış gösterdiğini bilmek önemli olacaktır.

Aim of study: The target of this study wasmeasuring the changes in IFD firmness and thickness values afterconstant-fatigue loading on the polyurethane (PUR) foams, with six differentdensities and two different categories, produced in Trabzon/Turkey. Material and Method: The foams were firstly exposedto indentation force deflection (IFD) and constant-fatigue tests based on ASTMD3574 standard. Then, the final IFD values ​​of the foams were determined afterloading and the changes in IFD values were reported. Main results: Results indicated thatincreasing the density of foam in normal category decreased the IFD loss ratein foam firmness. However, this was vice versa for the soft foams. The supportfactors of normal foams raised as density increased after constant-fatigueloading, however; the support factors of soft foams decreased as the densityincreased. All foams used in this study indicated a thickness loss lower than10% after constant-fatigue loading and, no visual failure was detected on theappearances of foams.Highlights: It is important to note that when using a softfoam in a sofa frame, it technically shows opposite behavior both in IFD lossand support factor values under constant-fatigue loading compared to normalfoam.

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