Study on Fracture Micro-Mechanics Mechanism and Dynamic Energy Absorption Property of Closed-Cell Foam Metals

Abstract:

In order to gain a deep understanding of energy absorption property and failure mechanism of closed-cell foam metals, the dynamic energy absorption property of closed-cell foam metals with matrix Al, matrix Al-Si6, matrix Al-Si12 CCAF, Mg matrix, aluminum-fiber and RE-Al alloys are discussed based on the compression and energy absorption test. The influence of different basis materials on absorption property of closed-cell foam metals is discussed, too. It also shows the micro topography of CCAF during the compression process. In addition, micro-mechanics failure mechanism of CCAF is discussed. Results obtained in this research include: (1) the compression deformation curves of different foam metals indicate that matrix Al CCAF is better for energy absorption materials, because of the best energy absorption property and the high strength. (2) the strength of metal foams with matrix Al-Si6, matrix Al-Si12 and matrix Mg are higher than that of matrix Al CCAF, and also have better energy absorption property. However, the failure characteristics of brittle fracture indicate obvious in matrix Al-Si6, matrix Al-Si12 and matrix Mg. (3) the micro-topography of CCAF with matrix Al is simple and uniform. Also the fracture has obvious tear trace. Aluminum-fiber and RE-Al alloys have better compression property, but lower strength and no strength increasing stage lead to destroy suddenly. (4) the curves of energy absorption for matrix Al and matrix Al-Si6CCAF are on the rise. And the maximum of energy absorption is about 2.1MJ/m³. (5) micropore and crack of closed-cell foam metals provide a good space for the compression and energy absorption. Meanwhile, it is the main failure parts of damage. Keywords: closed-cell foam metal; dynamic energy absorption; micro-topography; micro-mechanics

• Periodical: Materials Science Forum (Volumes 704-705)
• Pages: 804-810
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.704-705.804
• Online since: December 2011
• Authors: Xiang Feng Lv, Yi Shan Pan, Xiao Chun Xiao
• Keywords: Closed-Cell Foam Metal, Dynamic Energy Absorption, Micro-Mechanics, Micro-Topography

References

[1] J Banhart: Manufacture characterization and application of cellular metals and metal foams. Prog Mater Sci. Vol. 46(2001), pp.559-632.

DOI: 10.1016/s0079-6425(00)00002-5

[2] L J Gibson, M F Ashby: Cellular Solids: Structure and Properties. Oxford: Pergamon Press(1997), p.113.

[3] Guo Liuwei, Yu Jilin: Experimental investigations on the quasi-static axial crushing of foam-filled double square columns. Journal of Experimental Mechanics. Vol. 25(2010), pp.271-278.

[4] K Y G McCullough, N A Fleck and M A Ashby: Uniaxial stress-strain behaviour of aluminum alloy foams. Acta Mater. Vol. 47(1999), pp.2323-2330.

DOI: 10.1016/s1359-6454(99)00128-7

[5] S L Lopatnikov, B A Gama and M J Haque: High-velocity plate impact of metal foams. Int J Impact Eng. Vol. 30(2004), pp.421-445.

DOI: 10.1016/s0734-743x(03)00066-6

[6] H Kanahashi, T Mukai and Y Yamada: Experimental study for the improvement of crashworthiness in AZ91 magnesium foam controlling its microstructure. Mater Sci Eng A. Vol. A308(2001), pp.283-287.

DOI: 10.1016/s0921-5093(01)01199-6

[7] Y Feng, N Tao and Z G Zhu: Effect of aging treatment on the quasi-static and dynamic compressive properties of aluminum alloy foams. Mater Lett. Vol. 57(2003), pp.4058-4063.

DOI: 10.1016/s0167-577x(03)00265-9

[8] Lu Zixing, Guo Yu: Brief review of studies on the mechanical behavior of metallic foams. Journal of Beijing University of Aeronautics and Astronautics. Vol. 29(2003), pp.978-983.

[9] Zhang Jian, Zhao Guiping and Lu Tianjian: Experimental and Numerical Study on Strain Rate Effects of Close- Celled Aluminum Foams. Journal of Xi An Jiao Tong University. Vol. 44(2010), pp.97-101.

[10] CRUPI V, MONTANINI R: Aluminum foam sandwiches collapse modes under static and dynamic three-point bending. Int J Impact Eng. Vol34(2007), p.509−521.

DOI: 10.1016/j.ijimpeng.2005.10.001

[11] Wang Zhihua, Ma Hongwei and Zhao Longmao: Studies on the dynamic compressive properties of open-cell aluminum alloy foams. Scripta Mater. Vol54(2006), p.83−87.

DOI: 10.1016/j.scriptamat.2005.09.008