Optimum Design of Hybrid Graphite-Flax/Epoxy Laminated Composites for Minimum Cost, Minimum Weight and Maximum Frequency Using Modified Simulated Annealing Method

Öz

Ecological approach in automotive,  aerospace and marine industries have stated  that natural fibers  (especially flax) can be used as alternative reinforcing materials to glass fibers because of their inherent good natural frequency, low cost and weight performances. In this regard, the present paper investigates the effect of the usage of flax fiber on fundamental frequency, cost and weight in interply hybrid composite structures. Stacking sequences design and optimization of laminated composites based on Modified Simulated Annealing algorithm is considered. The optimization problem is to find  the number of high stiffness and less expensive laminates for maximum fundamental frequency-minimum cost and maximum fundamental frequency-minimum weight by multi objective optimization approach. The present study is the first to examine the frequency-cost and natural frequency-weight optimization problems of natural fiber reinforced laminated composites. The results show that the potential usage of symmetric-balance graphite–flax/epoxy hybrid  composite material instead of graphite/epoxy  is appropriate without sacrificing in stiffness-to-weight ratios.

Anahtar Kelimeler

• Hybrid laminated composite,fundametal frequency optimization,cost and weight reduction,natural fiber

Geliştirilmiş Benzetilmiş Tavlama Algoritması Kullanılarak Minimum Fiyat, Minimum Ağırlık ve Maksimum Doğal Frekans Açısından Hibrit Grafit-Keten/Epoksi Tabakalı Kompozitlerin Optimum Tasarımı

Öz

Otomotiv, havacılık ve denizcilik endüstrilerindeki ekolojik yaklaşım, doğal liflerin (özellikle keten) yüksek doğal frekans, düşük maliyet ve ağırlık performansları nedeniyle cam elyaflara alternatif takviye malzemeleri olarak kullanılabileceğini göstermiştir. Bu bağlamda, bu çalışma, keten lif kullanımının inter-ply hibrit kompozit yapılarda doğal frekans, maliyet ve ağırlık üzerindeki etkisini araştırmaktadır. Tabakalı kompozitlerin optimum açı dizilimlerinin tespiti Geliştirilmiş Benzetilmiş Tavlama Algoritması kullanılarak yapılmıştır. Mevcut çalışmada çok amaçlı optimizasyon yaklaşımı ile maksimum doğal frekansa sahip, hafif ve düşük maliyetli bir tasarım elde edebilmek için gerekli olan yüksek rijitliğe sahip düşük maliyetli tabakaların sayısı bulunmuştur. Bu çalışma, doğal bir fiber olan keten’e ait doğal frekans-fiyat ve doğal frekans-ağırlık optimizasyon problemlerini tabakalı kompozit plakalar açısından inceleyen literatürdeki ilk çalışma olma özelliğini taşımaktadır. Sonuçlar, simetrik-balans hibrit grafit-keten/epoksi kompozit malzemenin spesifik rijitlik oranından taviz vermeden istenen frekans, fiyat ve ağırlık optimizasyonunu sağlayarak grafit/epoksi yerine kullanılmasının uygun olduğunu göstermiştir

Anahtar Kelimeler

• Hibrit tabakalı kompozit,doğal frekans optimizasyonu,fiyat ve ağırlık azaltımı,doğal fiber

Kaynakça

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