Volume 2, Issue 1

    Prediction of Mechanical Properties of Nano-Composites Using Vibration Modal Analysis: Application to Aluminum Piston Alloys

    (Received 19 January 2013; accepted 1 November 2013)

    Published Online: 2013

    CODEN: MPCOAD

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    Abstract

    In this work, aluminum piston alloy-based nano-composites of high strength and ductility with large damping capacity were produced. Ni particles and Al2O3 particles were used as reinforcing agents to produce three nano-composites by adding three mixtures of these particles to the melt of Al-Si piston alloy at 700°C and application of stirring and squeeze casting. In addition, three micro-composites were produced by adding Ni particles of different percentages to the melt of the same matrix alloy and application of mechanical stirring and squeeze casting with the same conditions. The microstructures of the different materials were investigated using optical and scanning electron microscopes. Energy-dispersive x-ray analysis was carried out to analyze the elements of the reinforcing and matrix materials. Ultimate tensile strengths and engineering strains of the unreinforced and reinforced materials were evaluated by carrying out tension tests at room temperature. Modal tests were also carried out to evaluate the dynamic characteristics: natural frequency and damping ratio. The tests showed that the ultimate tensile strengths, ductility, and damping capacity of these composites were improved by the increase of both Ni and/or Al2O3 contents. A dynamic life indicator (damping ratio divided by natural frequency) is calculated for each material and showed a significant increase with the increase of nano-particles and/or micro-particles. By carrying out the experiments at different conditions, the mechanical properties, modal characteristics (such as natural frequency and damping ratio), and life indicator can be correlated. By constructing relationships between these properties and dynamic characteristics, the vibration modal analysis can be used for prediction of these properties and characteristics non-destructively.


    Author Information:

    El-Labban, Hashem F.
    Materials Technology and Forming Techniques, Dept. of Production Engineering, Alexandria Univ., Alexandria,

    Abdelaziz, M.
    Dept. of Advanced Materials, Central Metallurgical Research and Development Institute, Helwan, Cairo

    Yakout, Mostafa
    Machinery Dynamics and Diagnostics, Dept. of Production Engineering, Alexandria Univ., Alexandria,

    Elkhatib, A.
    Machinery Dynamics and Diagnostics, Dept. of Production Engineering, Alexandria Univ., Alexandria,


    Stock #: MPC20130006

    ISSN: 2165-3992

    DOI: 10.1520/MPC20130006

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    Author
    Title Prediction of Mechanical Properties of Nano-Composites Using Vibration Modal Analysis: Application to Aluminum Piston Alloys
    Symposium , 0000-00-00
    Committee A30