Damage Characterization during Compression in a Perlite-Aluminum Syntactic Foam

0517822 - ÚJF 2020 RIV CH eng J - Journal Article
Kadar, C. - Chmelík, F. - Ugi, D. - Máthis, K. - Knapek, Michal
Damage Characterization during Compression in a Perlite-Aluminum Syntactic Foam.
Materials. Roč. 12, č. 20 (2019), č. článku 3342. E-ISSN 1996-1944
R&D Projects: GA MŠMT EF16_013/0001794
Institutional support: RVO:61389005
Keywords : metal matrix composite * failure mechanisms * mechanical properties * acoustic emission
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.057, year: 2019
Method of publishing: Open access
https://doi.org/10.3390/ma12203342

Aluminum matrix (Al99.5) syntactic foam containing expanded perlite particles was produced using the pressure infiltration technique. The dominant deformation mechanisms during compression of this foam were determined by sequential k-means analysis of the acoustic emission data. Since the different deformation mechanisms were concurrently active even at small strains, successive unloading and reloading measurement was proposed for cluster identification. The repetitive unloading and reloading allowed us to identify two mechanical parameters, namely the unloading modulus and the loss for unloading-reloading cycles. Based on the correlations among the strain localization within the specimen, the acoustic emission results, the changes in these mechanical parameters, and the transition from quasi-elastic deformation to plasticity were revealed in this material.
Permanent Link: http://hdl.handle.net/11104/0303081