Defect and damage detection in filament wound carbon composite cylinders: A new numerical-experimental methodology based on vibrational analyses

In order to unravel the damage mechanisms occurring in composite-overwrapped pressure vessels (COPVs) subjected to crash conditions, a combined experimental-numerical study has been performed. For the purpose of generality and simplicity, quasi-static contacts on filament-wound cylinders are considered in this paper, as a precursor for geometrically complex impacts on COPVs. Rings with different wall thicknesses are tested to assess how failure mechanisms change when transitioning from thin-wall to thick-wall cylinders. The experimental results are used to identify, which mechanisms occur, and the numerical model is subsequently exploited to analyze the corresponding mechanisms. Based on the understanding of the mechanisms, a method to improve the damage tolerance of thick cylinders is presented. The rings are locally pre-delaminated during manufacturing to promote the growth of these pre-delaminations instead of the initiation of fiber failure.

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Impact Loading and Damage Detection in a Carbon Composite TX-100 Wind Turbine Rotor Blade

46th AIAA Aerospace Sciences Meeting and Exhibit ◽

10.2514/6.2008-1349 ◽

2008 ◽

Cited By ~ 8

Author(s):

Jonathan White ◽

Douglas Adams ◽

Mark Rumsey ◽

Jeroen Van Dam ◽

Scott Hughes

Keyword(s):

Damage Detection ◽

Wind Turbine ◽

Impact Loading ◽

Rotor Blade ◽

Turbine Rotor ◽

Carbon Composite ◽

Turbine Rotor Blade ◽

Wind Turbine Rotor

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Behavior of concrete columns confined by carbon composite tubes

Canadian Journal of Civil Engineering ◽

10.1139/l03-078 ◽

2004 ◽

Vol 31 (2) ◽

pp. 178-188 ◽

Cited By ~ 44

Author(s):

Won-Kee Hong ◽

Hee-Cheul Kim

Keyword(s):

Large Scale ◽

Glass Fibers ◽

Testing Machine ◽

Concrete Columns ◽

Longitudinal Axis ◽

Carbon Composite ◽

Filament Winding ◽

Axial Loads ◽

Composite Tubes ◽

Filament Wound

The carbon composite tube can play an important role in replacing or complementing longitudinal and transverse reinforcing steels by providing ductility and strength for conventional columns. In this study, both experimental and analytical investigations of axial behavior of large-scale circular and square concrete columns confined by carbon composite tubes are presented. The specimens are filament-wound carbon composite with 90° + 90°, 90° ± 60°, 90° ± 45°, and 90° ± 30° winding angles with respect to a longitudinal axis of a tube. The instrumented large-scale concrete-filled composite tubes are subjected to monotonic axial loads exerted by a 10 000 kN universal testing machine (UTM). The influence of transverse dilation, winding angle, thickness of a tube, as well as shape of the column section on stress–strain relationships of the confined columns is identified and discussed. Proposed equations to predict both strength and ductility of confined columns by carbon composite tubes demonstrate good correlation with test data obtained from large-scale specimens.Key words: carbon composites, glass fibers, strength, filament winding.

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