Abstract
This research provides a comparative study between metal syntactic foams (MSFs) manufactured using two different infiltration casting techniques. Counter-gravity infiltration (CGI) and low-pressure infiltration (LPI) casting methods are employed to manufacture aluminium alloy matrix MSFs with embedded lightweight expanded clay aggregate particles. The cast MSFs from both methods are then used as the core material in the empty aluminium tubes with or without adhesive to produce foam-filled tube (FFT) samples. The MSFs manufactured using the LPI technique show higher density compared to their CGI cast counterparts. The quasi-static compression of the MSFs in axial and lateral loading directions showed the shearing of the MSFs during their deformation. The deformation of the FFTs in axial compression was influenced by the type of adhesive material, while in their lateral compression, the effect of adhesive type was insignificant. The mechanical properties of the MSFs and FFTs using the LPI technique showed higher values. For both casting techniques, the mechanical properties of the MSFs and FFTs in axial compression outperformed their structural values obtained from lateral compression.
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