Delamination in composite rotors

Wettergren, Håkan L.

doi:10.1016/s1359-835x(96)00152-2

Cited by 11 publications

(6 citation statements)

References 3 publications

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“…H.L. Wettergren in his paper [25] studied this effect in composite rotors using the standard version of the finite element method.…”

Section: R N+1mentioning

confidence: 99%

Free vibration analysis of an embarked rotating composite shaft using the hp-version of the FEM

Boukhalfa

2010

Lat. Am. j. solids struct.

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This paper presents the study of the vibratory behavior of rotating composite shafts. The composite shaft contains isotropic rigid disks and is supported by bearings that are modeled as springs and viscous dampers. An hp-version of the Finite Element Method (FEM) is used to model the structure. A hierarchical finite element of beam type with six degrees of freedom per node is developed. The assembly is made by the standard version of the finite element method for several elements. A theoretical study allows the establishment of the kinetic energy and the strain energy of the system (shaft, disk and bearings) necessary to the result of the equations of motion. In this study the transverse shear deformation, rotary inertia and gyroscopic effects, as well as the coupling effect due to the lamination of composite layers have been incorporated. A program is elaborate for the calculation of the eigen-frequencies and critical speeds of the system. The results obtained compared with those available in the literature show the speed of convergence, the exactitude and the effectiveness of the method used. Several examples are treated, and a discussion is established to determine the influence of the various parameters and boundary conditions.

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“…H.L. Wettergren in his paper [25] studied this effect in composite rotors using the standard version of the finite element method.…”

Section: R N+1mentioning

confidence: 99%

Free vibration analysis of an embarked rotating composite shaft using the hp-version of the FEM

Boukhalfa

2010

Lat. Am. j. solids struct.

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“…When k becomes small, the radial tensile stress (r r ) tends to increase. Consequently, UDCF with small k is apt to suffer from premature radial delamination because of its low radial tensile strength [9]. As described in this paper, three-dimensional composites (3DCF) reinforced in three directions (r, h, z) were studied from the viewpoint of the effects of radial reinforcement.…”

Section: Introductionmentioning

confidence: 99%

Optimization of flywheel rotor made of three-dimensional composites

Hiroshima

Hatta

Koyama

et al. 2015

Composite Structures

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“…The large number of sensors requires complicated cabling and sophisticated acquisition instruments to deal with the large number of sensors. Moreover, for in situ monitoring, 3 Author to whom any correspondence should be addressed. cables and sensors exposed outside the structure are easily deteriorated by environmental effects.…”

Section: Introductionmentioning

confidence: 99%

Time-synchronized wireless strain and damage measurements at multiple locations in CFRP laminate using oscillating frequency changes and spectral analysis

Matsuzaki

Todoroki

Takahashi

2008

Smart Mater. Struct.

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Wireless monitoring of the health of CFRP structures reduces the cost and time of inspections and can be usefully applied for continuous monitoring. In a previous study, we presented a wireless sensor for detection of internal delamination in a CFRP laminate. The method utilizes a simple electrical resistance change in CFRP and so monitors delamination at only one location. For monitoring of large-scale structures, however, many sensors have to be distributed to cover the structure. A major problem for using many sensors is time synchronization among sensors. To overcome the problem and enable strain/damage to be monitored at multiple locations with time synchronization, we develop a simple wireless strain/damage sensor that consists of a bridge circuit, voltage-controlled oscillator and amplifiers. Since the sensor does not need A/D conversion procedures or memory storing, there is no time delay. Each sensor has an original basic frequency that changes in accordance with the electrical resistance. The frequencies from the multiple sensors are transmitted to a receiver. Using a short-time maximum entropy method, the received waves are converted to multiple electrical resistance data. The proposed method is applied to CFRP laminates and oscillating frequencies are measured in real time. The results show that the system successfully measures applied strain and detects fiber breakage at multiple locations in CFRP laminates with time synchronization.

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Delamination in composite rotors

Cited by 11 publications

References 3 publications

Free vibration analysis of an embarked rotating composite shaft using the hp-version of the FEM

Free vibration analysis of an embarked rotating composite shaft using the hp-version of the FEM

Optimization of flywheel rotor made of three-dimensional composites

Time-synchronized wireless strain and damage measurements at multiple locations in CFRP laminate using oscillating frequency changes and spectral analysis

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