Continuous Filament Advanced Composite Isogrid: A Promising Structural Concept

Rehfield, Lawrence W.; Deo, R. B.; Renieri, Gary D.

doi:10.1007/978-1-4684-1033-4_13

Cited by 16 publications

(6 citation statements)

References 1 publication

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“…The modeling of an active twist rotor (ATR) blade using a single crystal MFC actuator is presented in this section. The ATR blade is modeled as a thin-walled single cell composite beam based on Rehfield's model [2,23]. The assumptions for the single cell composite beam are as follows.…”

Section: Modeling Of Active Twist Rotor Bladesmentioning

confidence: 99%

Analytical development of single crystal Macro Fiber Composite actuators for active twist rotor blades

Park

Kim

2005

Smart Mater. Struct.

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A Macro Fiber Composite (MFC) is a piezoelectric fiber composite which has an interdigitated electrode, rectangular cross-section and unidirectional polycrystalline piezoceramic (PZT) fibers embedded in the polymer matrix. A MFC actuator has much higher actuation performance and flexibility than a monolithic piezoceramic actuator. Moreover, the single crystal piezoelectric material exhibits much higher induced strain levels, energy density and coupling than those of polycrystalline piezoceramic materials. Thus, the performance of an MFC can be improved by using single crystal piezoelectric fiber instead of polycrystalline piezoceramic fiber. This study investigates the analytical modeling, material properties and actuation performance of an MFC using single crystal piezoelectric material (single crystal MFC). For single crystal MFC, the mechanical properties are calculated by the classical lamination theory, and the uniform fields model (UFM) is adopted to predict piezoelectric strain constants. In addition, the actuation performance of the single crystal MFC with the active twist rotor blade is studied. The material properties and actuation performance of single crystal MFC are compared with those of standard MFC.

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Section: Modeling Of Active Twist Rotor Bladesmentioning

confidence: 99%

Analytical development of single crystal Macro Fiber Composite actuators for active twist rotor blades

Park

Kim

2005

Smart Mater. Struct.

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“…Saravanos [6] introduced a three-dimensional beam element developed for predicting the modal frequencies and damping of composite blades with hollow laminated cross-sections. This model was based on the shell displacement field equation presented by Rehfied [7] . But the finite element method is computational costly.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Analysis of the Rotating Composite Thin-Walled Cantilever Beams with Shear Deformation

Ren

Dai

2013

AMR

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This paper presents a theoretical study of the dynamic characteristics of rotating composite cantilever beams. Considering shear deformation and cross section warping, the equations of motion of the rotating cantilever beams are derived using Hamilton’s principle. The Galerkin’s method is used in order to analysis the free vibration behaviors of the model. Comparison of the theoretical solutions has been made with the results obtained from the finite element method, which prove the validity of the model presented in this paper. Natural frequencies are obtained for circular tubular composite beams. The effects of fiber orientation, rotating speed and structure parameters on modal frequencies are investigated.

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“…To date many researchers have investigated theoretically and experimentally the buckling strength of composite cylindrical shells. Rehfield et al (1980) made an intensive study on the buckling strength of composite isogrid cylindrical shells. They found that local crippling of the ribs, and skins buckling differ substantially from general buckling in terms of practical consequences for compressed stiffened cylindrical shells.…”

Section: Introductionmentioning

confidence: 99%

Optimization of geometric parameters of latticed structures using genetic algorithm

Hashemian

Kargarnovin

Jam

2011

Aircraft Engineering and Aerospace Technology

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PurposeThe purpose of this paper is to analyze a squared lattice cylindrical shell under compressive axial load and to optimize the geometric parameters to achieve the maximum buckling load. Also a comparison between buckling loads of a squared lattice cylinder and a solid hollow cylinder with equal weight, length and outer diameter is performed to reveal the superior performance of the squared lattice cylindrical shells.Design/methodology/approachA cylindrical lattice shell includes circumferential and longitudinal rods with geometric parameters such as cross‐section areas of the rods, distances and angles between them. In this study, the governing differential equation for buckling load which can be presumed as a criterion for designing lattice structures with a specific weight is derived and is used as an objective function in genetic algorithm (GA) method to calculate the optimum geometric parameters of the shell. The optimum parameters were modelled in finite element method (FEM) in order to verify the buckling loads obtained from GA. In another effort, the FEM was applied to analyze the solid hollow cylinders.FindingsThe results demonstrate relatively close agreement between the buckling loads obtained from GA and FEM for such shells. It was also shown that latticed cylinders have better performance to carry compressive axial loads than the equivalent solid hollow cylinders with equal weights, lengths and outer diameters.Research limitations/implicationsThe studies reported in this paper have been carried out for a single squared lattice shell without using two‐side skins. However, using skins can give better performance in carrying compressive axial loads.Practical implicationsThe results in this paper show that this type of effective, economical lightweight and functional structures could be applied as inter‐stages, inter‐tanks, aircraft fuselage, rocket motor cases, pressure vessels and other elements of civil engineering structures in order to have greater strength and lower weight.Originality/valueSquared lattice cylindrical shell with optimum geometric design could provide the chance for eliminating the stiffeners of shells in aerospace structures in order to decrease the weight and increase the load‐bearing capacity.

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Continuous Filament Advanced Composite Isogrid: A Promising Structural Concept

Cited by 16 publications

References 1 publication

Analytical development of single crystal Macro Fiber Composite actuators for active twist rotor blades

Analytical development of single crystal Macro Fiber Composite actuators for active twist rotor blades

Dynamic Analysis of the Rotating Composite Thin-Walled Cantilever Beams with Shear Deformation

Optimization of geometric parameters of latticed structures using genetic algorithm

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