Geometri İç Kalınlığının Yeni Tasarlanan Ökzetik Yapı Üzerine Etkisinin Araştırılması

Öz

Poisson oranı, malzemelerin ve yapının önemli mekanik özelliğidir. Yapı ve malzemeler negatif Poisson’s oranına sahip olduklarında Ökzetik olarak adlandırılırlar. Yeni yapıların tasarlanmasında Ökzetik yapıların özellikleri önemlidir, özellikle yapısal ve işlevsel olarak görevi olan mekanik özellikleri. Bu konu ile ilgili birçok araştırmacı deneysel ve teorik çalışma yapmıştır. Bu çalışmada, sonlu elemanlar analizi ile yeni tasarlanmış Ökzetik yapının Poisson’s oranı incelenmiştir. Geometri iç kalınlık yapılandırmalarına göre 14 farklı kafes yapısı incelenmiştir. Bütün incelenen yapılar negatif Poisson’s oranına sahiptir. Geometri iç kalınlığı arttıkça negatif Poisson’s oranı -1’e yaklaşmaktadır. En düşük Poisson’s oranı 4x4’lik düzendeki kafes yapısı ile 4x2’lik düzendeki kafes yapısının Poisson’s oranına bakıldığına en düşük Poisson’s oranı 4x2 ‘lik düzendeki kafes yapısına aittir. 4x2’lik düzendeki kafes yapısı daha Ökzetiktir. 4.9 mm geometri iç kalınlığı ve 4x2’lik düzende incelenen örnek yapı -0,55 ile en düşük Poisson’s oranına sahiptir. Uygulanan kuvvete yapının göstermiş olduğu etkiyi göstermek için sertlik değerleri ile sertlik/kütle değerleri incelenmiştir. Enerji sönümleme kabiliyetleri analiz edilmiştir.

Anahtar Kelimeler

• Negatif Poisson's Oranı
• Kafes Yapı
• Yeni yapı

Investigation of The Effect of Geometry Inner Thickness on New Designed Auxetic Structure

Öz

Poisson’s ratio is important mechanical property of materials and structure. Material and Structure showing negative Poisson’s ratios are called Auxetic. Properties of the Auxetic structures are very important to design the new structure, especially mechanical properties of the Auxetic materials that have structurally and functionally mission. Many researchers made experimental and theoretical works apropos this matter. In this study, the newly designed Auxetic lattice structure Poisson’s ratio was checked over via exploiting finite element analysis. 14 different lattice structures with respect to inner lattice thickness configurations are investigated. All examined structures have a negative Poisson’s ratio. Inner lattice thickness is increased; negative Poisson’s ratio values are decreased (closes to -1.) in these examined lattice structures. 4x2 lattice orientation has lowest Poisson’s ratio than 4x4 Lattice structure Poisson’s ratio, 4x2 is more Auxetic. 4.9 mm inner lattice thickness and 4x2 lattice matrix examined example has lowest Poisson’s ratio that is -0,55. Beneficial to indicate the purview of the structure on the applied force, the stiffness values and the stiffness/mass values were examined. Their energy dissipation capabilities were analyzed.

Anahtar Kelimeler

• Negative Poisson’s ratio
• Lattice Structure
• Novel Structure

Kaynakça

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