Damage detection method in complicated beams with varying flexural stiffness |
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Authors: | Kan Feng Zheng Li Gui-yun Gao Xian-yue Su |
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Institution: | Department of Mechanics and Aerospace Engineering, State Key Laboratory for Turbulence and Complex Systems, College of Engineering, Peking University,Beijing 100871, P. R. China |
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Abstract: | A damage detection method for complicated beam-like structures is proposed based on the subsection strain energy method (SSEM),
and its applicability condition is introduced. For a beam with the continuously varying flexural stiffness and an edge crack,
the SSEM is used to detect the crack location effectively by numerical modal shapes. As a complicated beam, the glass fiber-reinforced
composite model of a wind turbine blade is studied based on an experimental modal analysis. The SSEM is used to calculate
the damage index from the measured modal parameters and locate the damage position in the blade model successfully. The results
indicate that the SSEM based on the modal shapes can be used to detect the damages in complicated beams or beam-like structures
for engineering applications. |
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Keywords: | nondestructive testing modal strain energy varying flexural stiffness beam fiber reinforced composite material wind turbine blade |
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