Journal
JOURNAL OF COMPOSITE MATERIALS
Volume 51, Issue 6, Pages 773-781Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/0021998316654305
Keywords
Metallic syntactic foams; expanded perlite; fatigue; infiltration; mechanical characterization
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Funding
- Janos Bolyai Research Scholarship of the Hungarian Academy of Sciences
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The main purpose of this paper is to present the basic fatigue properties of metal matrix syntactic foams. The investigated syntactic foams consisting of expanded perlite and A356 aluminum matrix were produced using an inert gas pressure infiltration technique. The obtained foams were subjected to cyclic compressive loading in order to investigate their fatigue properties. The standard procedure for cyclic fatigue testing was slightly modified to account for the variation of porosity and strength which is typical for metallic foam samples. This approach allows the direct comparison of the fatigue test results between all investigated samples. Depending on the applied load level, two different failure mechanisms were identified that resulted in characteristic deformation - loading cycle curves. The failure mechanisms were further investigated on the microstructural scale: traces of fatigue beachmarks and extensive plastic deformation were found. Furthermore, Wohler-like deformation - lifetime diagrams were created in order to predict the expected lifetime of the properties of metal matrix syntactic foams .
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