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Bir üretim kusuru: fiber distorsiyonu ve polimer kompozitlerin termomekanik özellikleri üzerindeki etkisi

Bu çalışmanın amacı, bir üretim kusuru olan, lif bozulmalarının, kompozit malzemelerin ortaya çıkan termoelastik davranışı üzerindeki etkisini sonlu elemanlar mikromekanik modellemesi ile altıgen olarak paketlenmiş Temsili Hacim Elemanlarında (THE) araştırmaktır. Reçinenin kür çevrimi boyunca anlık termokimyasal ve termoelastik davranışı modele uygulanır. Bu, kürleme döngüsünün sonunda %0 ila %18 arasında fiber distorsiyonlarına sahip olan kompozitlerin termomekanik özelliklerinin hesaplanmasını sağlar. Fiber distorsiyonunun, proses kaynaklı artık gerilmeler ve Termal Genleşme Katsayıları (TGK) değerleri üzerinde büyük etkisi olduğu bulunmuştur. Fiber distorsiyonu ile artık gerilimlerin ve TGK’ların değişimini ifade eden denklemler elde edilir. Bu çalışma, kompozit malzemelerin sonlu elemanlar modellemesinde bir üretim kusuru olan fiber distorsiyonlarının dikkate alınmasının önemini kanıtlamaktadır.

Anahtar Kelimeler:

Kompozit malzemeler, imalat kusuru, fiber bozulması (distorsiyon), thermomekanik özellikler

A manufacturing imperfection: fiber distortion and its effect on thermomechanical properties of polymer composites

The aim of this study is to investigate the effect of a production imperfection, fiber distortions, on the resulting thermoelastic behaviour of composite materials in hexagonally packed Representative Volume Elements (RVEs) with finite elements micromechanical modelling. Instantaneous thermochemical and thermoelastic behavior of resin throughout the cure cycle is implemented into the model. This enables to calculate the resulting thermomechanical properties of composites, having fiber distortions from 0 to 18%, at the end of the cure cycle. It is found that the fiber distortion has great effect on the process induced residual stresses and Coefficients of Thermal Expansion (CTE) values. Equations expressing the variation of residual stresses and CTEs with fiber distortion are obtained. This study proves the importance of consideration of fiber distortions, a manufacturing defect, in finite element modeling of composite materials.

Keywords:

Composite materials, imperfection, fiber distortion, thermomechanical properties,

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