Paper number 240
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ULTRASONIC MEASUREMENT OF IN-PLANE MODULI OF PULTRUDED COMPOSITES |
R. Prabhakaran1, M. Saha2, and T. Galloway3
1,2Department of Mechanical Engineering, Old Dominion University
Norfolk, Virginia 23529, U.S.A.
3College of Engineering and Technology, Old Dominion University
Norfolk, Virginia 23529, U.S.A.
| Summary | The in-plane Young's modulus (E) and shear modulus (G) of pultruded composites have been measured using piezoelectric sensors. The feasibility of using a single specimen, in the form of a circular disk, has been shown. Two types of piezoelectric crystals, one for producing dilatational waves ('E-crystal') and the other for producing shear waves ('G-crystal') have been utilized. The baseline values for the angular dependence of E and G for the composite material were established by testing bar specimens; the shear modulus was measured using G-crystals on opposite faces as well as by positioning E-crystals in slots near the opposite ends. In the case of circular disk specimens of a large diameter, the G-crystals are limited by the energy dissipation in the composite; positioning E-crystals in slots at the opposite ends of diameters provides a convenient way of measuring G. |
Keywords | Young's modulus, shear modulus, pultruded composites, circular disk specimen, piezoelectric sensors. |