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Characterization of piezo-film sensors for direct vibration and impact measurements

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Abstract

Piezo-film sensors were employed in determining the dynamic response of [(0 deg/90 deg)4]s s-glass/epoxy laminates and 2024 aluminum specimens. Simple beam- and plate-type sensor equations were derived based on classical plate theory incorporating the linear piezoelastic constitutive relationship. A series of vibration and impact tests were conducted for the determination of structural dynamic response. Piezo-film sensors, with a thickness and area of 110 μm and 1×1 cm2, respectively, were connected directly to a voltage measurement device in these tests. The first three bending frequencies of the glass-fiber-reinforced plastic (GFRP) cantilever specimen were examined. Experimental results and those simulated by the MARC finite-element code were found to be in good agreement, with the difference between the two being less than five percent. At frequencies above 3 kHz, piezo-film transducers are capable of closely detecting structural dynamic response in the absence of charge amplification. At frequencies lower than approximately 3 kHz, however, the voltage measured directly from a piezo-film sensor underestimates structural response. A modified piezo-film sensor equation is thus proposed for lower frequency measurements. Effect of frequency and piezo-film's size on lower frequency attenuation is explicitly formulated based on a simple RC circuit analogy. Drop tests were also performed on clamped [(0 deg/90 deg)4]s GFRP laminates and aluminum targets, with nine piezo-film sensors being glued to the specimen's distal surface in order to determine the low-speed impact response. Specimen transient central deflection subjected to impact loading was identified based on test findings and the plate-type piezo-film sensor equation. The results were found to be in good agreement with the numerical solution obtained from the MARC finite-element code.

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Authors and Affiliations

  1. Institute of Aeronautics and Astronautics, National Cheng Kung University, 1 University Road, 701, Tainan, Taiwan, R.O.C.

    S. T. Jenq (Associate Professor) & C. K. Chang (Graduate Assistant)

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  1. S. T. Jenq
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  2. C. K. Chang
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Jenq, S.T., Chang, C.K. Characterization of piezo-film sensors for direct vibration and impact measurements. Experimental Mechanics 35, 224–232 (1995). https://doi.org/10.1007/BF02319662

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  • DOI: https://doi.org/10.1007/BF02319662

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