DESIGN AND OPTIMISATION OF A CHIRAL EUXETIC LATTICE STRUCTURE WITH RECTANGULAR CROSS-SECTION HAVING VARIOUS ASPECT RATIO

Yıl 2024, , 265 - 282, 31.08.2024

Cem Yılmaz , İlyas Kacar

https://doi.org/10.54365/adyumbd.1440934

Öz

In this study, a chiral lattice is designed in a cubic form. The cross-section is rectangular. Polyethylene, Ti6Al4V, AlSi10Mg, 316 stainless steel, polyamide-6, polypropylene, and resin polyamide/Nylon-66 were used as materials. One end of the structure is fixed with an anchored support while the free end is subjected to axial displacement. Finite element based simulations were used for structural analysis. As a result of the simulation, stress, deformation and Poisson's ratio values were obtained. These parameters were subjected to genetic algorithm based optimisation. The aim of the optimisation is to obtain maximum strength in the structure with minimum size. Because lightweight structures are preferred in terms of both construction and material costs. As a result, the best-fit-for-purpose dimensions were determined. In addition, a response function showing the relationship between the parameters was obtained. The optimum cross section is 0.5x0.2 mm and in this case the structure could withstand a displacement of -0.9 mm A stress of 23.636 MPa occurred on the structure. This value is far below the yield strength of the material. In this case, the mass of the structure is 0.298 grams.

Anahtar Kelimeler

Finite element simulations, Composite panel, optimization, 3D chiral auxetic lattice

FARKLI EN/BOY ORANINA SAHİP DÖRTGENSEL KESİTLİ BİR KİRAL ÖKZETİK HÜCRESEL YAPININ TASARIM VE OPTİMİZASYONU

Öz

Bu çalışmada kübik formda bir kiral kafes yapısı tasarlanmıştır. Kesit dörtgenseldir. Malzeme olarak polietilen, Ti6Al4V, AlSi10Mg, 316 paslanmaz çelik, polyamid-6, polipropilen ve reçine polyamid/Naylon-66 kullanılmıştır. Yapının bir ucu ankastre mesnet ile sabitlenmişken serbest ucu ise eksenel yer değiştirmeye maruz bırakılmıştır. Yapısal analiz için sonlu eleman esaslı simülasyon kullanılmıştır. Simülasyon sonucunda gerilme, deformasyon, Poisson oranı değerleri elde edilmiştir. Bu parametreler genetik algoritma esaslı optimizasyona tabi tutulmuştur. Optimizasyonun amacı, minimum boyuta sahip yapıda, maksimum dayanım elde edebilmektir. Zira hafif yapılar hem inşa hem de malzeme maliyetleri açısından tercih edilmektedir. Amaca uyan en iyi boyutlar tespit edilmiştir. Ayrıca parametreler arasındaki ilişkiyi gösteren bir cevap fonksiyonu elde edilmiştir. Optimum kesit 0,5x0,2 mm olup bu durumda yapı -0,9 mm'lik bir yer değiştirmeye dayanabilmiştir. Yapıda en fazla 23,636 MPa çekme ve 1,3266 MPa basma gerilmesi oluşmuştur. Bu değer malzemenin akma dayanımının altındadır. Bu hâli ile yapı kütlesi 0,298 gramdır.

Anahtar Kelimeler

Sonlu elaman simülasyonu, Kompozit panel, optimizasyon, 3B kiral ökzetik kafes

Teşekkür

Bu çalışmanın inceleme ve değerlendirme aşamasında yapmış oldukları değerli katkılardan dolayı editör, hakem ve emeği geçenlere içten teşekkür ederim.

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