Compressive properties and energy absorption characteristics of open-cell nickel foams
(1. Department of Materials Science and Engineering, Yantai Nanshan University, Yantai 265713, China;
2. School of Materials Science and Engineering, Central South University, Changsha 410083, China
Received 19 October 2015; accepted 5 July 2016)
2. School of Materials Science and Engineering, Central South University, Changsha 410083, China
Received 19 October 2015; accepted 5 July 2016)
Abstract: Open-cell nickel foams with different relative densities and pre-stretching degrees were subjected to room temperature quasi-static compressive tests to explore their compressive properties. The compressive properties of the nickel foams including yield strength, elastic modulus, energy absorption density and energy absorption efficiency were calculated accurately. The results show that the compressive properties of yield strength, elastic modulus and energy absorption density increase with the increase of relative density of nickel foams. The compressive properties are sensitive to the pre-stretching degree, and the values of yield strength, elastic modulus and energy absorption density decrease with the increase of pre-stretching degree. However, the energy absorption efficiency at the densification strain state exhibits the independence of relative density and pre-stretching degree. The value of energy absorption efficiency reaches its peak when the strain is at the end of the collapse plateau region.
Key words: nickel foam; compressive property; relative density; pre-stretching degree