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Effect of Internal Structure in the Compression Behavior of Casted Al/LECA Composite Foams

1
CMEMS-UMinho, University of Minho, Campus Azurem, 4800-058 Guimaraes, Portugal
2
MEtRiCS-UMinho, University of Minho, Campus Azurem, 4800-058 Guimaraes, Portugal
*
Author to whom correspondence should be addressed.
J. Compos. Sci. 2018, 2(4), 64; https://doi.org/10.3390/jcs2040064
Received: 4 September 2018 / Revised: 8 October 2018 / Accepted: 23 October 2018 / Published: 1 November 2018
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Abstract

In this paper, low-cost, aluminum-based composite metal foams are produced by the gravity die casting technique using lightweight expanded clay (LECA) as space holders. The influence of the voids generated by LECA particles on the syntactic composite samples density and mechanical behavior is characterized by quasi-static uniaxial compression. It is shown that smaller particles generate higher relative densities and a reduction in the value of densification strain. The use of larger particle diameter promotes an increase in yield strength and a more stable plateau region of the stress–strain curve, leading to higher values of crushing energy absorption. The influence of the internal structure on these experimental results is correlated with elasto-plastic numerical simulations, and it is suggested that a small mismatch in LECA particle diameter is advantageous for enhancing mechanical properties. View Full-Text
Keywords: syntactic foam; aluminum alloy; lightweight expanded clay (LECA) particles; casting syntactic foam; aluminum alloy; lightweight expanded clay (LECA) particles; casting
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MDPI and ACS Style

Puga, H.; Carneiro, V.H.; Barbosa, J. Effect of Internal Structure in the Compression Behavior of Casted Al/LECA Composite Foams. J. Compos. Sci. 2018, 2, 64.

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