Crashworthiness Performance of Al6061 Tubes with Stiffened Quatrefoil Sections under Axial and Oblique Impact Conditions

This study presents the crashworthiness performance of Al6061 tubes with stiffened quatrefoil sections under axial and oblique impact conditions. Influences of different types of stiffeners through the depth of tubes in the design of a quatrefoil sectional crash absorber structure are investigated, numerically. Four types of stiffener patterns are considered under oblique impact angles of 0º, 10º, 20º, and 30º measured from the horizontal axis. Force-displacement characteristics, deformation patterns, and crashworthiness indexes of the tested tubes are given to decide optimal crash absorber configuration. The numerical tube models are placed between two rigid plates and an axial impact speed of 1m/s is considered in the numerical study. Al6061 series aluminum alloy is used as a tube material with a multi-linear material model assuming strain-rate independent properties. It is found that the crashworthiness performance is very sensitive to impact angle and Q-S-4 type stiffeners can be proposed for a better tube design.

Anahtar Kelimeler:

Crashworthiness performance, oblique impact, quatrefoil section, stiffener, finite element method

Güçlendirilmiş Dört Folyo Kesitli Al6061 Tüplerinin Eksenel ve Eğik Darbe Koşulları Altında Çarpışma Dayanıklılık Performansı

Bu çalışmada, güçlendirilmiş dört-yaprak kesitlere sahip Al6061 boruların eksenel ve eğik darbe koşulları altında çarpışma dayanımı performansı sunulmaktadır. Dört-yaprak kesitli bir darbe sönümleyici yapının tasarımında boru derinliği boyunca farklı tipte desteklerin etkileri sayısal olarak incelenmiştir. Yatay eksenden ölçülen 0º, 10º, 20º ve 30º eğik darbe açıları altında, dört farklı tipte destek geometrisi incelenmiştir. Test edilen modellerin kuvvet-yer değiştirme karakteristikleri, deformasyon şekilleri ve darbe dayanıklılık indeksleri optimum darbe sönümleyici konfigürasyonunu belirlemek için kullanılmıştır. Sayısal modeller, iki rijit plaka arasına yerleştirilmiş ve sayısal çalışmada 1m/s’lik bir eksenel çarpma hızı dikkate alınmıştır. Al6061 serisi alüminyum alaşımı, gerinim oranından bağımsız malzeme özellikleri varsayılarak, çoklu-doğrusal malzeme modeli dikkate alınarak boru malzemesi olarak kullanılmıştır. Darbe dayanımı performansının çarpma açısına çok duyarlı olduğu ve daha iyi bir boru tasarımı için Q-S-4 tipi desteklerin önerilebileceği sonucuna varılmıştır.

Keywords:

Darbe dayanımı, eğik darbe, dört-yaprak kesit, destek, sonlu elemanlar metodu,

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