Macroscopic fracture behavior of nickel foam under tension
Multidiscipline Modeling in Materials and Structures
ISSN: 1573-6105
Article publication date: 13 June 2016
Abstract
Purpose
The samples of nickel foam with porosity of about 88 percent were uniaxially tensioned at room temperature, and the phenomena of tensile fracture were compared with that from the fully dense plate of metal nickel. The purpose of this paper is to investigate the differences between their behaviors of tensile fracture.
Design/methodology/approach
The tensile test was carried out by using the tester of CMT-series microcomputer-controlled electronic universal testing machine. The difference of tensile fracture behavior between the nickel foam and the dense metal nickel was discussed by analyzing the load-displacement curve and the microscopical fracture.
Findings
The results indicated that, nickel foam also displayed the feature of macroscopic plastic-deformation during tension, but it showed a macroscopic brittleness much more than that of the fully dense body. The axial apparent strain at the maximum load for the foamed sample was markedly less than that for the dense one. In addition, an obviously gradual course exhibited for the foamed body during tensile failure and a rapidly instant course for the dense body correspondingly.
Originality/value
There have been some studies on the tensile behavior for metal foams, but much less than on the compression, and the relevant works are mostly for aluminum foam. The present work provides the investigations on the difference of tensile fracture behavior between the nickel foam and the dense metal nickel, as well as that of the corresponding samples in various cases with different tensile velocities. It is found that the porosity can make a remarkable decrease of the apparent strain at the maximum load and a significant increase of the macroscopical brittleness for the metallic nickel under tension.
Keywords
Acknowledgements
This paper has been supported by the Testing Foundation of BNU (No. C15). The authors would like to thank Ms X.L.Wu, an associate professor at the Key Laboratory of Beam Technology and Material Modification of Ministry of Education, for her kind help in finishing this paper.
Citation
Yang, Q.C., Zhang, M.J. and Liu, P.S. (2016), "Macroscopic fracture behavior of nickel foam under tension", Multidiscipline Modeling in Materials and Structures, Vol. 12 No. 1, pp. 110-118. https://doi.org/10.1108/MMMS-05-2015-0025
Publisher
:Emerald Group Publishing Limited
Copyright © 2016, Emerald Group Publishing Limited