MDO/MSO of Slender Thin Walled Box Beam Model

2017 ◽  
Author(s):  
Francesco Danzi ◽  
Giacomo Frulla ◽  
Enrico Cestino ◽  
James M. Gibert
Keyword(s):  
Beam Model ◽  
Box Beam ◽  
Thin Walled

scholarly journals Numerical/Experimental Validation of Thin-Walled Composite Box Beam Optimal Design

Aerospace ◽  
2020 ◽  
Vol 7 (8) ◽  
pp. 111
Author(s):  
Enrico Cestino ◽  
Giacomo Frulla ◽  
Paolo Piana ◽  
Renzo Duella
Keyword(s):  
Optimal Design ◽  
Composite Structures ◽  
Experimental Validation ◽  
Torsional Stiffness ◽  
Beam Model ◽  
Angle Distribution ◽  
Structural Configuration ◽  
Box Beam ◽  
Thin Walled ◽  
Composite Box Beam

Thin-walled composite box beam structural configuration is representative of a specific high aspect ratio wing structure. The optimal design procedure and lay-up definition including appropriate coupling necessary for aerospace applications has been identified by means of “ad hoc” analytical formulation and by application of commercial code. The overall equivalent bending, torsional and coupled stiffness are derived and the accuracy of the simplified beam model is demonstrated by the application of Altair Optistruct. A simple case of a coupled cantilevered beam with load at one end is introduced to demonstrate that stiffness and torsion angle distribution does not always correspond to the trends that one would intuitively expect. The maximum of torsional stiffness is not obtained with fibers arranged at 45° and, at the maximum torsional stiffness, there is no minimum rotation angle. This observation becomes essential in any design process of composite structures where the constraints impose structural couplings. Furthermore, the presented theory is also extended to cases in which it is necessary to include composite/stiffened hybrid configurations. Good agreement has been found between the theoretical simplified beam model and numerical analysis. Finally, the selected composite configuration was compared to an experimental test case. The numerical and experimental validation is presented and discussed. A good correlation was found confirming the validity of the overall optimization for the optimal lay-up selection and structural configuration.

Research on Ultimate Strength and Accumulated Plastic Deflection of Box Beam under Cyclic Loading

2014 ◽  
Vol 496-500 ◽  
pp. 567-570
Author(s):  
Hu Wei Cui ◽  
Ping Yang ◽  
Can Sen ◽  
Liang Zhou
Keyword(s):  
Cyclic Loading ◽  
Numerical Simulations ◽  
Ultimate Strength ◽  
Beam Model ◽  
Thin Wall ◽  
Cyclic Bending ◽  
Box Beam ◽  
Bending Loads ◽  
Thin Walled

The aim of this paper is to study the ultimate strength of a thin-wall box beam under cyclic bending loads. The nonlinear numerical simulations have been performed on the cyclic behaviors of a thin-walled box beam to investigate the ultimate strength and accumulative plastic deflection effect. Four cyclic loading cases are analyzed in the numerical simulations for the Fukumoto B-60-1 box beam model. The results of the simulations by the paper are discussed and they shall provide some valuable information to further study on the problem.

Computer analysis of thin-walled concrete box beams

1989 ◽  
Vol 16 (6) ◽  
pp. 902-909 ◽  
Author(s):  
Shahbaz Mavaddat ◽  
M. Saeed Mirza
Keyword(s):  
Key Words ◽  
Computer Analysis ◽  
Shear Stresses ◽  
Shear Lag ◽  
Applied Loading ◽  
Box Beam ◽  
Box Beams ◽  
Three Stages ◽  
Thin Walled ◽  
Normal And Shear Stresses

Three computer programs, written in FORTRAN WATFIV, are developed to analyze straight, monolithically cast, symmetric concrete box beams with one, two, or three cells and side cantilevers over a simple span or over two spans with symmetric mid-span loadings. The analysis, based on Maisel's formulation, is performed in three stages. First, the structure is idealized as a beam and the normal and shear stresses are calculated using the simple bending theory and St-Venant's theory of torsion. The secondary stresses arising from torsional and distortional warping and shear lag are calculated in the second and third stages, respectively. The execution times on an AMDAHL 580 system are 0.02, 0.93, and 0.25 s for the three programs, respectively. The stresses arising in each stage of analysis are then superposed to determine the overall response of the box section to the applied loading. The results are compared with Maisel's hand calculations. Key words: bending, bimoment, box beam, computer analysis, FORTRAN, shear, shear lag, thin-walled section, torsion, torsional and distortional warping.

Static and Dynamic Validations of a Refined Thin-Walled Composite Beam Model

AIAA Journal ◽  
2001 ◽  
Vol 39 (12) ◽  
pp. 2422-2424 ◽  
Author(s):  
Zhanming Qin ◽  
Liviu Librescu
Keyword(s):  
Composite Beam ◽  
Beam Model ◽  
Thin Walled

Vibration Response of a Thin-Walled Cylindrical Pipe with Liquid

2012 ◽  
Vol 189 ◽  
pp. 345-349
Author(s):  
Yu Lan Wei ◽  
Bing Li ◽  
Li Gao ◽  
Ying Jun Dai
Keyword(s):  
Finite Element ◽  
Natural Frequencies ◽  
Element Model ◽  
Beam Model ◽  
Vibration Modes ◽  
Timoshenko Beam Model ◽  
Cylindrical Pipe ◽  
Bending Vibration ◽  
Beam Bending ◽  
Thin Walled

Vibration characteristics of the thin-walled cylindrical pipe are affected by the liquid within the pipe. The natural frequencies and vibration modes of the pipe without liquid are analyzed by the theory of beam bending vibration and finite element model, which is based on the Timoshenko beam model. The first three natural frequencies and vibration modes of the pipe with or without liquid are acquired by experiments. As shown in the experiment results, the natural frequencies of the containing liquid pipe are lower than the natural frequencies of the pipe without liquid.

Some studies on static analysis of composite thin-walled box beam

1997 ◽  
Vol 62 (4) ◽  
pp. 625-634 ◽  
Author(s):  
R. Suresh ◽  
S.K. Malhotra
Keyword(s):  
Static Analysis ◽  
Box Beam ◽  
Thin Walled

On the Modeling of Coupled Vibration of Rotating Thin-Walled Closed-Section Composite Beams

2010 ◽  
Vol 26-28 ◽  
pp. 758-763
Author(s):  
Yong Sheng Ren ◽  
Xiang Hong Du ◽  
Wen Li Yao
Keyword(s):  
Equations Of Motion ◽  
Laminated Composite ◽  
Coupled Vibration ◽  
Cross Sectional ◽  
Box Beam ◽  
Vibration Model ◽  
Thin Walled ◽  
The Galerkin Method ◽  
Sectional Analysis ◽  
Asymptotical Method

The free vibration model of a rotating composite thin-walled closed-section beams is presented in this paper. The two-dimensional cross-sectional analysis based on the variational-asymptotical method(VAM) is combined with the Hamilton’s principle to derive the equations of motion and associated boundary conditions of the beams. The Galerkin method is employed in order to solve the coupled differential equations. The natural frequency results obtained for the present model are compared with those of the existing models. Numerical results are obtained for the laminated composite cantilevered box beam with Circumferentially Uniform Stiffness(CUS) configuration, the effects of the fiber orientation, pitch and precone on the natural frequencies associated with coupled vibration modes are investigated.

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