Effect of cell size on the energy absorption of closed-cell aluminum foam
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Jinglin Xu
Abstract
Aluminum foam could be used as a defense against explosion and shock wave. Its energy absorption capability is an important indicator to evaluate its blast resisting ability. But since the impedance of aluminum foam is much lower than that of metal, it is hard to measure its exact stress-strain relation by means of the traditional Split Hopkinson pressure bar (SHPB) method. To evaluate the energy absorption characteristic of aluminum foams of varied cell sizes, an improved SHPB method is proposed. This improved method can enhance the accuracy of the stress-strain curve of aluminum foam and by using a longer striker, might increase the strain on the samples. Two aluminum foams of different cell sizes were selected. The experimental results show that the cell size of the aluminum foam and the strain rate have a significant effect on the compressive characteristics and energy absorption. Smaller cell aluminum foam is stronger than that with larger cells due to fewer flaws in the microstructure. Aluminum foam of a smaller cell size can absorb more energy than larger cell aluminum foam due to higher plateau stress. The energy absorption of smaller cell aluminum foam increases by 42 % at strain rate 3579 s−1 compared with quasi-static compression while larger cell foam increases 55 % at a strain rate of 1586 s−1.
Kurzfassung
Aluminiumschaum kann als Werkstoff im Verteidigungsbereich unter Explosions- und Schockwellenbeanspruchung verwandt werden. Die Möglichkeit zur Energieabsorption ist ein wichtiger Indikator um die Blastwiderstandsfähigkeit zu evaluieren. Aber der Widerstand von Alumniumschaum ist weitaus geringer als der metallischer Werkstoffe. Es ist schwierig, eine akkurate Spannungs-Dehnungs-Relation mit dem traditionellen Split Hopkinson Pressure Bar (SHPB) Test zu erhalten. Um die Energieabsorptionscharakteristik von Aluminiumschaum mit verschiedener Zellgröße zu evaluieren, wird ein verbesserter SHPB Test propagiert. Das verbesserte verfahren kann die Akkuranz der Spannungs-Dehnungs-Kurve von Aluminiumschaum verbessern und eine größere Dehnung auf der Probe aufbringen, indem ein längerer Bolzen verwandt wird. Es wurden zwei Aluminiumschäume mit unterschiedlicher Zellgröße ausgewählt. Die experimentellen Ergebnisse zeigen, dass die Zellgröße des Aluminiumschaumes und die Dehnrate einen signifikanten Effekt auf die Kompressionscharakteristik und die Energieabsorpierfähigkeit haben. Der Aluminiumschaum mit einer geringeren Zellgröße hat eine höhere Festigkeit als der mit einer größeren Zellgröße, weil weniger Anrisse in der Mikrostruktur auftreten. Somit kann der Aluminiumschaum mit geringerer Zellgröße aufgrund der höheren Plateauspannung eine höhere Energie absorbieren als der mit größerer Zellgröße. Die Energieabsorption des Aluminiumschaumes mit der geringeren Zellgröße nimmt um 42 % bei einer Dehnrate von 3579 s−1 im Vergleich zur quasi-statischen Kompression zu, während die Energieabsorption des Aluminiumschaumes mit der größeren Zellgröße um 55 % bei einer Dehnrate von 1586 s−1 zunimmt.
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© 2018, Carl Hanser Verlag, München
Articles in the same Issue
- Inhalt/Contents
- Contents
- Fachbeiträge/Technical Contributions
- Application of magnetic Barkhausen noise for residual stress analysis – Consideration of the microstructure
- An experimental and numerical investigation of the effects of geometry and spot welds on the crashworthiness of vehicle thin-walled structures
- Mechanical properties and fracture mechanism of glass fiber/epoxy composites
- Effect of quenching on microstructure and properties of modified Al-bearing high boron high speed steel
- Metallurgical investigation of electron beam welded duplex stainless steel X2CrNiMoN22-5-3 with plasma nitrided weld edge surfaces
- Effect of cell size on the energy absorption of closed-cell aluminum foam
- Bending and lateral crushing behavior of a GFRP and PA6 reinforced aluminum square tube
- Thermografische Rekonstruktion von internen Wärmequellen mittels virtueller Schallwellen
- Comparison and evaluation of different processing algorithms for the nondestructive testing of fiber-reinforced plastics with pulse thermography
- Quenching and tempering of 51CrV4 (SAE-AISI 6150) steel via medium and low frequency induction
- Atmospheric corrosion behavior of carbon steel and galvanized steel in Southwest China
- Influence of cutting temperature when drilling carbon black reinforced polyamides
- Effect of the sintering temperature on the coating of duplex stainless steel with Ni3Al
- Influence of different nanomaterials on the mechanical properties of epoxy matrix composites
- Properties of Al/SiC metal matrix composites
Articles in the same Issue
- Inhalt/Contents
- Contents
- Fachbeiträge/Technical Contributions
- Application of magnetic Barkhausen noise for residual stress analysis – Consideration of the microstructure
- An experimental and numerical investigation of the effects of geometry and spot welds on the crashworthiness of vehicle thin-walled structures
- Mechanical properties and fracture mechanism of glass fiber/epoxy composites
- Effect of quenching on microstructure and properties of modified Al-bearing high boron high speed steel
- Metallurgical investigation of electron beam welded duplex stainless steel X2CrNiMoN22-5-3 with plasma nitrided weld edge surfaces
- Effect of cell size on the energy absorption of closed-cell aluminum foam
- Bending and lateral crushing behavior of a GFRP and PA6 reinforced aluminum square tube
- Thermografische Rekonstruktion von internen Wärmequellen mittels virtueller Schallwellen
- Comparison and evaluation of different processing algorithms for the nondestructive testing of fiber-reinforced plastics with pulse thermography
- Quenching and tempering of 51CrV4 (SAE-AISI 6150) steel via medium and low frequency induction
- Atmospheric corrosion behavior of carbon steel and galvanized steel in Southwest China
- Influence of cutting temperature when drilling carbon black reinforced polyamides
- Effect of the sintering temperature on the coating of duplex stainless steel with Ni3Al
- Influence of different nanomaterials on the mechanical properties of epoxy matrix composites
- Properties of Al/SiC metal matrix composites
