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Wednesday, July 15, 2020 | History

2 edition of Optimization of composite box-beam structures including effects of subcomponent interaction found in the catalog.

Optimization of composite box-beam structures including effects of subcomponent interaction

Scott A. Ragon

Optimization of composite box-beam structures including effects of subcomponent interaction

by Scott A. Ragon

  • 163 Want to read
  • 5 Currently reading

Published by College of Engineering, Virginia Polytechnic Institute and State University, National Aeronautics and Space Administration, National Technical Information Service, distributor in Blacksburg, VA, [Washington, DC, Springfield, Va .
Written in English

    Subjects:
  • Beams (Supports),
  • Bending.,
  • Buckling.,
  • Composite structures.,
  • Design analysis.,
  • Optimization.,
  • Panels.,
  • Torque.

  • Edition Notes

    Other titlesOptimization of composite box beam structures including effects of sumbcomponent interaction.
    StatementScott A. Ragon, Zafer Gürdal, James H. Starnes, Jr.
    SeriesNASA contractor report -- NASA CR-199667.
    ContributionsGürdal, Zafer., Starnes, James H., United States. National Aeronautics and Space Administration.
    The Physical Object
    Pagination1 v.
    ID Numbers
    Open LibraryOL15419045M

    Composite joints • Coupling analytical methods with FEA • Stiffened panel modeling approaches • Composite optimization • Continuous vs. Discrete Sizing • Designing composites for producibility and repair Fabrication Analysis Design Structural Design & Analysis with Composite Materials. Prof. Ganguli has proposed powerful evolutionary optimization methods for the strength based design of composite box-beams (Kathiravan and Ganguli, Composite Structures, ) and has developed approaches for the design of low weight composites using different failure criteria (Sateesh et al, Mechanics of Advanced Materials and Structures, ).

      Typical failure modes of composite blades were studied in the full-scale collapse tests,,,,,,,,,,, including geometric nonlinearity mainly characterized as local buckling and cross-sectional ovalization, i.e., the Brazier effect, and material failures such as fiber breakage, matrix damage, debonding and failure modes and failure behavior have also been. Dan Luo, Yifeng Zhong, Boshu Li, Bin Deng. Static and dynamic analysis of composite box beam based on geometrically exact nonlinear model considering non-classical effects. Composite Structures () – [17] Cheol Kim, Scott R White. Thick-walled composite beamtheory including 3-D elastic effects and torsional warping[J].

    LECTURE BEAMS: COMPOSITE BEAMS; STRESS CONCENTRATIONS ( – ) Slide No. 16 Composite Beams ENES ©Assakkaf Bending of Members Made of Several Materials – When the moduli of elasticity of various materials that make up the beam structure are not negligible and they should be accounted for, then procedure for. The CD-ROM displays figures and illustrations in articles in full color along with a title screen and main menu screen. Each user can link to all papers from the Table of Contents and Author Index and also link to papers and front matter by using the global bookmarks which allow navigation of the entire CD-ROM from every article.


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Optimization of composite box-beam structures including effects of subcomponent interaction by Scott A. Ragon Download PDF EPUB FB2

Optimization of composite box-beam structures including effects of subcomponent interaction Author: Scott A Ragon ; Zafer Gürdal ; James H Starnes ; United States. Optimization of composite box-beam structures including effects of subcomponent interactions By Jr.

James H. Starnes, Zafer Guerdal and Scott A. Ragon Abstract. Optimization of composite box-beam structures including the effects of subcomponent interaction. Ragon, Z. Guerdal and; J. Starnes, Jr. Control/structure design optimization using covariance control including saturation limits and stability robustness.

device. The optimization algorithm is based on the Nedler-Mead Simplex Method and was used to determine the lay-ups providing the highest fundamental frequencies for a specific box-beam.

For the box-beam studied, the most detrimental vibration mode was wall squinting and the optimal lay-up involved high ply angles at the top and bottom of the.

This work addresses the optimum design of a composite box-beam structure subject to strength constraints. Such box-beams are used as the main load carrying members of helicopter rotor blades.

[19] Ragon S., Gürdal Z. and Starnes J., “ Optimization of Composite Box-Beam Structures Including Effects of Subcomponent Interactions,” NASA CRGoogle Scholar [20] Wang M., Wang X. and Guo D. Do well [3] and Houbolt and Brooks [6] including elastic bending and torsion of twisted non-uniform rotocraft blades.

These blades employ composite box beams as primary load-bearing structures. Bicos and Springer [7] described a composite box-beam using a built-up method where composite laminates are connected with stringers to form the box-beam.

A methodology for performing bilevel structural optimization of aircraft wing structures is proposed. Optimization of composite box-beam structures including effects of subcomponent interactions. In this study, the optimization formulations include non-linear failure constraints. This present study has important significance for the structural design and optimization of wind turbine blades.

Starnes's 69 research works with 1, citations and 2, reads, including: Shell Buckling Design Criteria Based on Manufacturing Imperfection Signatures. 37th Structure, Structural Dynamics and Materials Conference August Optimization of composite box-beam structures including the effects of subcomponent interaction S.

Ragon. structures where the constrained warping effect can be taken into account. They worked with both open and closed cross sections. Also, to check the validity of the method for structures made of composite materials, a beam with thin, composite walls were studied. Wu et al.

[9] presented a. Effect of stiffness characteristics on the response of composite grid-stiffened structures. Damodar R. Ambur and Optimization of composite box-beam structures including the effects of subcomponent interaction. Experimental investigation [2] of composite box beams pointed out the probable failure mechanism is more likely that the failure of the box beam is buckling driven.

Due to the strong correlation. Full (%) interaction case Let us now assume that the beams are joined together by infinitely stiff shear connection along the face AB in Fig.

As slip and slip strain are now zero everywhere, this case is called “full interaction”. In this case the depth of the composite beam is 2h with a breadth b, so that I. AbstractThe analytical model applicable to calculate the equivalent stiffnesses of composite box beam has been refined.

The calculation of equivalent stiffness coefficients of composite laminated box beam is simplified and the connection between shear-deformable beam theory and classical laminate theory is established. The equivalent stiffness analytic formulas expressed by beam cross-section.

Supported Composite Beams for Strength” was one of the first two design booklets of the Composite Structures Design Manual, which is now being completed and maintained by OneSteel.

The initial development work required to produce the design booklets was carried out at BHP Melbourne Research Laboratories before its closure in May The ECC beam is instrumented with 32 copper electrodes mounted to the bottom face of the beam.

A section roughly cm long and cm wide is delineated in the center of the beam by the electrodes (Figure ).Twelve electrodes are attached along each of the long sides of this region, and four electrodes are attached on each of the shorter sides.

Effect of Fiber Orientation Angle and Number of Layers on the Box-Beam. Deformations. Elghazaly. and tunnel structures, including the applications of FRP composite beam, deck, and column. Optimization of an Orthotropic Composite Beam, MSC Thesis, Faculty of Rensselaer Polytechnic Institute, Hartford,   Beyond a certain point the relatively lower stiffness of composite materials (include carbon fiber composites) requires a move away from rigid structures towards compliant structure design and the acceptance of significant deflections as ordinary behaviour, either through pre-deformed geometry or load reducing deformations.

composite in bridge, and tunnel structures, including the applications of FRP composite beam, deck, and column. Beam is one of the most important structural elements in any structural system, so knowing the structural behavior of beams is very important.

In this study an analytical solution for composite.AV-8B COMPOSITE WING TEST PROGRAM A visual overview of typical coupon, element, and subcomponent specimens tested during the Harrier composite wing development program illustrates again the concern of structural designer/analysts with the effects of stress risers on structural integrity.

From the above, for the carbon–epoxy box beam under torsional load without external restraint the following conclusions can be drawn: 1. For model I and model II, they have the same shear stress flow q for model I, (α 16) r =0 which results in (ε x) r =0 so the composite box beam is in the state of free the other hand, it is noticeable that different from free torsional.