Mechanical Behavior of Layered Composite Structures of Aluminum Foam Partially Filled with Polyamide

Du, Wanrong and Orbulov, Imre Norbert and Tamás-Bényei, Péter and Kádár, Csilla (2025) Mechanical Behavior of Layered Composite Structures of Aluminum Foam Partially Filled with Polyamide. PERIODICA POLYTECHNICA MECHANICAL ENGINEERING, 69 (2). pp. 164-170. ISSN 0324-6051

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Abstract

In this study, the mechanical properties of layered composite structures were investigated. We achieved the layered structure by hot-pressing 1 mm, 3 mm, or 5 mm thick polyamide 6 (PA) sheets into the pores on the top and bottom sides of an open-cell metal foam at 240 °C and 15 MPa (150 bar). The PA-infiltrated depths varied with the thickness of the hot-pressed PA sheets. According to the bending and post-impact bending tests, flexural strengths improved as the infiltration depth of PA increased. Compared to the metal foam, a maximum of 15% increase in flexural strength and a 400% increase in residual flexural strength were measured. However, using a 1 mm thick PA sheet lowered the flexural strength of the open-cell metal foam. We found that the 1 mm thick PA sheet failed to fully infiltrate the foam pores, resulting in residual voids at the metal-PA interface, which caused premature fracture during bending.

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