Kesik Bir Koninin Ezilme Davranışı Hakkında Tasarım ve Test Parametrelerinin Etkileri Üzerine Nümerik Bir Çalışma

Yıl 2021, Cilt: 21 Sayı: 2, 462 - 468, 30.04.2021

Ali İmran Ayten

https://doi.org/10.35414/akufemubid.828083

Öz

Farklı tasarım parametreleri ve test hızları için alüminyum kesik bir konik yapının ezilme davranışı ile ilgili nümerik bir çalışma gerçekleştirilmiştir. Nümerik modeller Ls-Prepost v4.7.1 yazılımında hazırlandı ve simülasyonlar Ls-Dyna çözücüsünde gerçekleştirildi. Alüminyum tüp ve rijit plakanın davranışlarını taklit etmek için sırasıyla Mat_18 plastisite ve Mat_20 rijit malzeme modelleri kullanıldı. Alt ve üst çap oranı, rijit plakanın temas açısı ve test hızı gibi üç farklı parametrenin etkileri araştırıldı. Her durum için kuvvet-yer değiştirme eğrileri elde edildi ve yukarıda bahsedilen parametrelere sahip geometrilerin ezme davranışlarını anlamak için değerlendirildi. 2.5 alt/üst çap oranına sahip olan geometrinin, tüm geometriler arasında en yüksek enerji sönümlemesi gerçekleştirdiği belirlendi.

Anahtar Kelimeler

Ezilme davranışı, Kesilmiş koni, Nümerik simülasyon, Ls-Dyna, Alüminyum

A Numerical Study About the Effects of Design and Test Parameters on the Crushing Behavior of a Truncated Cone

Öz

A numerical study was performed on the crushing behavior of an aluminum truncated cone structure for different design parameters and test speeds. Numerical models were prepared in the Ls-Prepost v4.7.1 software, and simulations were run in the Ls-Dyna solver. The Mat_18 power law plasticity and Mat_20 rigid material models were used for mimicking the behaviors of the aluminum tube and rigid plate, respectively. The effects of three different parameters as the ratio of the bottom and top diameters, contact angle of the rigid plate and test speed were investigated. Force-displacement curves for each case were obtained and evaluated to understand the crushing behaviors of the geometries with the aforementioned parameters. The geometry which had the 2.5 bottom/top diameter ratio performed the highest energy absorption among all geometries.

Anahtar Kelimeler

Crushing behavior, Truncated cone, Numerical simulation, Ls-Dyna, Aluminum

Kaynakça

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