Journal
MATERIALS LETTERS
Volume 257, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.matlet.2019.126733
Keywords
Porous materials; Deformation and fracture; Modal analysis; Syntactic foams
Funding
- Janos Bolyai Research Scholarship of the Hungarian Academy of Sciences
- Higher Education Excellence Program of the Ministry of Human Capacities (Hungary)
- National Research, Development and Innovation Fund (Hungary) [TUDFO/51757/2019-ITM]
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This paper presents a new non-destructive method applying modal analysis to determine the failure state of the AlSi12 matrix syntactic foam containing ceramic hollow spheres. The results proved that the decrease in natural frequencies of the first two modes and the calculated effective Young's modulus indicate the damage state of the syntactic foam's structure during compression. Both the natural frequencies and the elastic modulus start to change after the onset of fracture of hollow spheres, which is similar to 60 MPa, according to our previous work. A 5% decrease in these parameters are suggested as a practical limit of the deterioration of a load-bearing structure, which collides with the maximum in the acoustic emission activity. (C) 2019 Elsevier B.V. All rights reserved.
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