Modem structures must be light, stiff and well damped to resist static and dynamic loads. Since the structure often required to be light weight, the stiffness of the structures becomes relatively weak. For a conventional materials the stiffness and damping are conflicting properties. Composite materials are widely used in the engineering applications because of their multi advantages. With the increasing use of composite materials in the structural applications has come a corresponding increase in the need for experimental data specially in dynamic loading conditions. Most of the composite materials are susceptible failure under dynamic loading. A filled structures are used as an easy way to tailor the required performance of a structure. A square cross-sectional aluminum tube filled with thermoset plastic or sand particles plastic composite of different particle size and constituents ratios were statically and dynamically tested. In this work, an impact vibration technique using Dual Channel Signal Analyzer was used for the measurement of the global modified structure are natural frequency, damping, complex modulus of elasticity and sound velocity in the structure. The filling process improves the static and dynamic properties of the structure, which verifies lightweight, stiff and well damped structure as Well as lower cost.
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