Investigations of the reinforcing effect of wires in compound-extruded aluminum profiles under quasi-static tension and compression are presented. The reinforced aluminum matrix compounds were compared to non-reinforced samples regarding their mechanical properties and fracture surfaces. Considering the mechanical properties, both ropes and wires emerged to be a promising approach for compound-extruded profiles under tensile load. Ropes or wires at a volume content of 11 % increase the ultimate tensile strength substantially when compared with non-reinforced specimens. Specimens subject to compression tests were examined using micro computer tomography and light microscopy and showed good results. Correlating the experimentally determined compound tensile strength with calculations based on a simple model presented by Kelly good coincidence could be shown; differences may be based on debonding processes at the reinforcement-matrix interface or are due to the specimens containing only one single reinforcement. Under compression, the failure stress for both rope- and wire-reinforced samples is higher than under tensile loads. Thereby, the increase in failure stress is more pronounced for wire-reinforced compounds. Nevertheless, neither ropes nor wires made from the chosen materials significantly increase the specific stiffness of the compounds. The existence of a metallurgical bond between reinforcement and matrix for compound extrusions was confirmed by the present results. Further investigations ought to focus on ceramic fiber-reinforced compounds, which are supposed to provide a substantial increase of specific stiffness.
Mechanical properties of compound-extruded aluminum-matrix profiles under quasi-static loading conditions
2006
11 Seiten, 10 Bilder, 4 Tabellen, 12 Quellen
Aufsatz/Kapitel (Buch)
Englisch
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