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Determination Of Elastic Constants Of Filament Wound Composite Cylindrical Shells Using Laser-Induced Guided WavesC.-C. Yin, J.-S. Liaw and P.-S. Chu
Department of Mechanical Engineering
National Chiao Tung University
Nondestructive determination of elastic stiffness of the filament wound composite shells is a challenge and is of interest for both research and practical purposes. Complex phenomenon due to elastic wave scattering at the woven rove crossing points usually results in difficulty to measure wave speeds of ultrasonic bulk waves. The present method determines the elastic constants based on phase velocity data measured from laser-generated guided waves and theoretical calculation. The filament wound composite cylindrical shells are made up of a number of woven roving with distinct winding orientations to form a stack of laminae in [± qn/90m] winding pattern. Each lamina is modeled as a homogeneous, transversely isotropic material. The first order shear deformation theory was used to evaluate the dispersive phase velocities of various types of guided waves propagating in cylindrical composite shells. Dispersion curves of the guided waves based on the elastic constants from inversion were shown in a good agreement with experimental data. Surface responses of the circumferential guided waves, longitudinal waves, and flexural waves in composite cylindrical shells and their capabilities in determination of elastic constants were also discussed.
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