Experimental and numerical studies on the folding response of annular-rolled Al tube

Mete, Osman H.; Yalçın, Muhammet; Genel, Kenan

doi:10.1016/j.tws.2018.03.015

Cited by 19 publications

(4 citation statements)

References 32 publications

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“…The initial elastic compressive behaviour of 3D printed materials mainly depended on the precursor polymer and the infill density. However, contrary to what was observed while testing foams, in which the crush plateau was smooth and approximately stable at a value of σ PL , the plateau region for 3D printed specimens showed features similar to those observed for aluminium tubes tested in compression [27,28]. The stress vs. strain curves revealed smooth peaks and troughs, which could be associated with the folding of the cylindrical structure in a concertina mode.…”

Section: Quasi-static Compression Testscontrasting

confidence: 80%

On the Compressive Response of Polymeric Cellular Materials

Rosso

Iannucci

2020

Materials

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This paper presents a series of compression tests performed on a variety of high performance lightweight cellular materials conventionally used in energy absorption applications. Compressive tests were performed over a range of strain rates with a universal testing machine and a single stage gas gun. Experimental results revealed a dependency of the mechanical properties on the polymeric precursor, density, infill topology and strain rates. The dynamic strength of the investigated materials was determined through a material parameter identification study via the finite element (FE) method. Numerical results matched well with the experimental results and revealed a substantial enhancement in the compressive strength of the tested material from quasi-static to dynamic loading regimes by as much as 87%. The strength of 3D printed polymers was superior with respect to the tested polymeric foams. On the other hand, polymeric foams showed higher efficiency and energy absorption ability.

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Section: Quasi-static Compression Testscontrasting

confidence: 80%

On the Compressive Response of Polymeric Cellular Materials

Rosso

Iannucci

2020

Materials

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“…e penetrator model was modeled in Hypermesh/LS-DYNA to obtain the finite element model shown in Figure 4. e contact between the outer protective shell and the soil medium was defined by the ERODING_SURFACE_TO_SURFACE contact type, the contact type between the internal scientific instrumentations was defined by the AUTOMATIC_ SUR-FACE _TO_SURFACE contact type, and the friction coefficient was set as 0.1 [21][22][23][24][25]. e thin-walled material was aluminum alloy AA6060-T4, and the filling material was aluminum foam.…”

Section: Penetration Modelmentioning

confidence: 99%

Buffering Performance of High‐Speed Impact Space Penetrator with Foam‐Filled Thin‐Walled Structure

Luo

Liu

et al. 2019

Shock and Vibration

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High-speed penetrators carrying detection equipment impact planetary bodies at high speeds, and they are therefore buried at depths of up to several meters beneath the surface. During the friction and collision with the crust of the planet, the acceleration of the scientific instrumentation is significantly large. The vibration protection structure for scientific instrumentation is necessary for the reduction of the peak value of the acceleration response and the improvement of the survival rate. In this study, a penetrator with a multilayered energy absorbing structure was developed to improve the survival rate of the penetrator, of which the foam-filled thin-walled structure (FTS) was applied to the penetrating vibration-damping structure. The penetration process of the penetrator into the planetary medium was simulated using the LS-DYNA software platform. The results obtained using empirical formulas and theoretical derivations were compared with the results of the numerical analysis. The reliability of the penetrator limit element model was then verified by conducting an impulse response experiment and simulation. The results suggest that FTS has a positive influence on the isolation impact and energy absorption. Moreover, the vibration isolation effects of nine different FTSs were evaluated with respect to the following six factors: impact isolation efficiency, load efficiency, peak of acceleration, peak impact force, total energy absorption, and specific energy absorption. Furthermore, the design of the damping structure provides an indispensable solution for penetrator detection.

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“…Tüp yapının kendi cidarı üzerinde simetrik olmayan bir şekilde katlanması durumunda (elmas katlanma), kat geometrileri ve ortalama kuvvet değerlerinin hesaplanabileceği teorik bir çalışma Pugsley [2] tarafından * Yazışılan yazar/Corresponding author yapılmıştır. Tüp yapıların absorbe ettikleri enerji değerleri, tüp yapının dairesel [3], kare kesitli [4] veya konik [5] olmasına bağlıyken deformasyonun hangi katlanma modelinde gerçekleşeceği ise tüp yapının geometrik ölçülerine [6], kuvvetin eksenel veya açılı [7], [8] uygulanması ve hızı [9] ile doğrudan ilişkilidir. Tüp yapıların katlanması sırasında, tüp cidarının deformasyon öncesi durumdaki ortalama çapın içine ve dışına doğru yönlendiği bilinmektedir [10].…”

Section: Introductionunclassified

Investigation into the effect of the functionally graded and sandwich PVC foam filling on the energy absorption capability of 6063-T5 Al tubes

Yalçın¹,

Genel²

2020

Pamukkale J Eng Sci

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Bilindiği üzere metalik tüpler, yüksek enerji absorbe etme kabiliyetleri nedeniyle birçok farklı alanda tercih edilmektedir. Bu özelliklerinin geliştirilmesi amacıyla tüplerin farklı köpük türleriyle içeriden takviye edilmeleri, halen güncelliğini korumaktadır. Bu çalışmada, farklı PVC köpük yoğunlukları ile (60, 80 ve 100 kg/m 3 ) tek tip yoğunluklu, fonksiyonel derecelendirilmiş yoğunluklu ve sandviç yapılı olacak şekilde üç farklı kombinasyonda takviye edilmiş 6063-T5 serisi alüminyum tüplerin enerji absorbe etme kabiliyetleri (EAK) deneysel olarak incelenmiştir. Her bir takviye kombinasyonunda üç tabaka köpük kullanılmış ve köpük yoğunluklarının EAK üzerine etkisinin daha net ortaya konulabilmesi için tabaka kalınlıkları değiştirilmiştir. Deney sonuçları, tüm numune kombinasyonları göz önünde bulundurulduğunda, absorbe edilen enerji değerindeki artışın %18 ile %43 arasında olduğunu, en yüksek enerji değerinin ise sandviç yapılı takviyede elde edildiğini göstermiştir. Tek tip yoğunluklu takviye kombinasyonundaki en yüksek enerji ise orta yoğunluklu (80 kg/m 3 ) köpüğün kullanıldığı numunede, takviyesiz yapıya göre %37 daha yüksek elde edilmiştir. Numunelerin absorbe ettikleri enerjinin ağırlıklarına oranı olarak ifade edilen özgül enerji absorbe etme (ÖEA) değerleri tüm numuneler için hesaplanmış ve en yüksek ÖEA değeri sandviç yapılı takviyede, takviyesiz tüpe göre yaklaşık %11 daha yüksek olarak, 27.71 J/g değerinde elde edilmiştir. Buna mukabil bazı numunelerin ÖEA değerleri, takviyesiz tüp yapıdan daha düşük değerlerde olmuştur.Metallic tubes are preferred in many different fields due to their energy absorbing efficiency. In order to increase the ability to absorb energy, foam filling by using different types of foam is still up to date. In this study, the energy absorbing capability of 6063-T5 aluminum tubes which were filled by using three different foam densities (60, 80 and 100 kg/m 3 ) were investigated experimentally. Base tubes were filled by using three different foam filling models such as uniform density, functionally graded and sandwich model. In addition, in each foam filling models, different sample combinations were obtained by changing the thickness of the foam layers. The highest energy value absorbed in the uniform density foam filling model was obtained in the combination of 80 kg/m 3 density foam, which is 37% higher than the base tube. Considering all specimen combinations, the increase in the absorbed energy value is between 18% and 43%, while the highest value was obtained in the sandwich model. In the examination of the test results, the specific energy absorption values of each specimen were also taken into consideration. The specific energy values for some sample combinations were lower than the base tube, while the highest value was obtained in the sandwich model with the value of 27.71 J/g which is about 11% higher compared to the base tube. In contrast, the specific energy absorption values of some specimens were lower than the base tube.

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Experimental and numerical studies on the folding response of annular-rolled Al tube

Cited by 19 publications

References 32 publications

On the Compressive Response of Polymeric Cellular Materials

On the Compressive Response of Polymeric Cellular Materials

Buffering Performance of High‐Speed Impact Space Penetrator with Foam‐Filled Thin‐Walled Structure

Investigation into the effect of the functionally graded and sandwich PVC foam filling on the energy absorption capability of 6063-T5 Al tubes

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