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9 March 2014 Guided wave interaction with defects in isotropic and composite plates
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This paper considers the effects of various damage features on guided wave (GW) propagation in isotropic and composite plates using both the local interaction simulation approach (LISA) and experimental methods. First, through-thickness holes in isotropic plates and graphite-epoxy laminates are simulated to establish LISA's ability to capture the GW scattering effects of various hole sizes and positions. GW generation from piezo-ceramic wafers is modeled using the recently developed LISA hybrid approach. The LISA results for the cross-ply case are compared with experimental measurements to evaluate the quality of the simulation. Next, low-velocity impact damage in composite plates is simulated and experimentally characterized. Barely-visible impact damage from a drop-weight fixture is analyzed using laser vibrometry and surface-mounted sensors to quantify its effect on GW fields. Three different methods of simulating the resulting impact are demonstrated using LISA, and the results are compared with the experiment to evaluate the damage modeling techniques. Results from the through­ thickness hole study show the effect of sensor position on the strength of damage signals. Impact damage is successfully modeled in LISA using an inverted V-shaped profile with reductions in shear and elastic moduli.
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Matthew B. Obenchain and Carlos E. S. Cesnik "Guided wave interaction with defects in isotropic and composite plates", Proc. SPIE 9064, Health Monitoring of Structural and Biological Systems 2014, 906423 (9 March 2014); doi: 10.1117/12.2044124;

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