Experimental study of energy absorption in a close-celled aluminum foam under dynamic loading
- Osaka Municipal Technical Research Inst. (Japan)
- Osaka Prefecture Univ., Sakai, Osaka (Japan). Dept. of Metallurgy and Materials Science
- Shinko Wire Co., Ltd., Izumisano, Osaka (Japan)
- National Industrial Research Inst. of Nagoya (Japan)
- Lawrence Livermore National Lab., CA (United States)
Recently, there is a high interest in using light-weight metallic foams (e.g., Al and Mg) for automotive, railway and aerospace applications where weight reduction and improvement in comfort are needed. Metallic foams also have a potential for absorbing impact energy during the crashing of a vehicle either against another vehicle or a pedestrian. To effectively absorb the impact energy, a material is required to exhibit an extended stress plateau. In order to evaluate the impact energy absorption, the relation between the compressive stress and strain at a dynamic strain rate must be characterized. The stress-strain behavior at dynamic strain rates is often characterized by using the split Hopkinson pressure bar (SHPB) method. A previous study suggested that, to evaluate reliably the mechanical properties of cellular materials, the height of a specimen should be ten or twenty times larger than the cell diameter to minimize the scatter of measurements. In the present study, therefore, the authors first determined the minimum height of aluminum foam specimens for compression test at a quasi-static strain rate by comparing the specific yield stress (i.e., yield stress per (relative density){sup 3/2}) of the foam with the other data previously reported. The relative stress of the aluminum foam as a function of relative density was also calculated and compared with those of other aluminum foams, along with the plot of Gibson and Ashby.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 352446
- Journal Information:
- Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 8 Vol. 40; ISSN 1359-6462; ISSN SCMAF7
- Country of Publication:
- United States
- Language:
- English
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