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Thursday, July 23, 2020 | History

3 edition of Energy-absorption capability and scalability of square cross section composite tube specimens found in the catalog.

Energy-absorption capability and scalability of square cross section composite tube specimens

Gary L. Farley

Energy-absorption capability and scalability of square cross section composite tube specimens

by Gary L. Farley

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  • 15 Currently reading

Published by National Aeronautics and Space Administration, Langley Research Center, U.S. Army Aviation Systems Command, For sale by the National Technical Information Service in Hampton, Va, [St. Louis, Mo.], [Springfield, Va .
Written in English

    Subjects:
  • Composite materials.

  • Edition Notes

    Other titlesEnergy absorption capability and scalability of square cross section composite tube specimens
    StatementGary L. Farley.
    SeriesNASA technical memorandum -- 89088, USA AVSCOM technical memorandum -- 87-B-3, AVSCOM technical memorandum -- 87-B-3.
    ContributionsLangley Research Center., United States. Army Aviation Systems Command.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL17098909M

    SDM Acoustic and Aerodynamic Loads • Monday, 23 April • hrs. ICCSA - Free ebook download as PDF File .pdf), Text File .txt) or read book online for free. conference

    7. Conclusion This chapter studies a problem of lay-up optimization for a cantilevered long tube-like composite structure with varied cross-section that is manufactured by winding of glass fiber unidirectional tape. The optimized composite structure is the tube-like cantilever slender beam experiencing distributed bending and torsion forces. The explosion test of four full-scale circular cross section and four full-scale square section concrete-filled steel tubular columns was researched. Applying axial pressure to four concrete-filled steel tubular columns with deflection-to-span ratio less than 1/ after explosion, the residual bearing capacity of concrete-filled steel tubular.

    Search the history of over billion web pages on the Internet. International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research.


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Energy-absorption capability and scalability of square cross section composite tube specimens by Gary L. Farley Download PDF EPUB FB2

Farley studied the static crushing process of graphite/epoxy and Kevlar/epoxy square cross section tubes to investigate the effect of geometry on energy absorption of composite materials.

He reported that energy absorption of graphite/epoxy and Kevlar/epoxy tubes is a non-linear function of (b / t) where b is the side of the box and t is the Cited by: Get this from a library.

Energy-absorption capability and scalability of square cross section composite tube specimens. [Gary L Farley; Langley Research Center.; United States. Army Aviation Systems Command.]. Energy-absorption capability and scalability of square cross section composite tube specimens.

By Gary L. Farley. Abstract. Static crushing tests were conducted on graphite/epoxy and Kevlar/epoxy square cross section tubes to study the influence of specimen geometry on the energy-absorption capability and scalability of composite materials Author: Gary L.

Farley. Virginia ENERGY-ABSORPTION CAPABILITY AND SCALABILITY OF SQUARE CROSS SECTION COMPOSITE TUBE SPECIMENS by Gary L. Farley Aerostructures Directorate U.S. Army Research and Technology Activity - AVSCOM NASA Langley Research Center Hampton, VA ABSTRACT Static crushing tests were conducted on graphite/epoxy and Kevlar/epoxy square cross section tubes to study the influence of specimen geometry on the energy-absorption capability and scalability of composite.

The combination of square cross-sectional glass FRP tube with embedded circular cross-sectional carbon FRP tubes had the highest synergetic energy absorption capability. View Show abstract. Static crushing tests were conducted on graphite/epoxy and Kevlar/epoxy square cross section tubes to study the influence of specimen geometry on the energy-absorption capability and scalability.

Farley, ‘Energy Absorption Capability and Scalability of Square Cross Section Composite Tube Specimens, in “U.S. Army Research and Technology Activity–AVSCOM”, NASA-TM A method of predicting the crash-related energy-absorption capability of composite tubes is presented.

The method is based upon a phenomenological model of. Farley, G. L., Energy-Absorption Capability and Scalability of Square Cross Section Composite Tube Specimens, Journal of the American Helicopter Society, April ().

Hanagud, J.I. Craig, P. Sriram and W. Zhou, Energy Absorption Behavior of Graphite Epoxy Composite Sine Webs, Journal of Composite Materials, Vol. 23, May (). Then specimens were kept under °C conditions for h, h, and h, respectively. The effects of crushing speed, temperature treatment, reinforced forms and structures including hybrid ratio, fiber orientation, and thickness of tube wall on energy absorption capabilities were investigated by quasi static and dynamic compression tests.

There are two types of energy absorption capability, which are specific energy absorption (SEA) and volumetric energy absorption.

SEA is described as cross-section areas in which the material is in contact with the top platen at any deformation, or in other words, SEA can be defined as the total of absorbed energy per unit mass.

Results showed that the tube’s energy absorption capability was affected significantly by varying of oblique loading. It is also found that as the filling polyurethane foam into pultruded E-glass reinforced polyester composite square tube increases the amount.

The Journal of the AHS is the world's only scientific journal dedicated to vertical flight technology. It is a peer-reviewed technical journal published quarterly by The Vertical Flight Society and presents innovative papers covering the state-of-the-art in all disciplines of VTOL design, research and development.

(Please note that VFS members receive significant discounts on articles and. Many researchers conducted experiments on energy absorption of composite tubes both circular and square cross sections.

It was concluded that geometrical shape significantly influences the energy absorption capability of composite structures. The rate sensitivity of energy absorption devices and composite structures has been investigated experimentally using a building block approach.

In the current phase of the program, the effects of load/stroke rate on the crushing responses of laminated corrugated beams and the scaling effects associated with the rate sensitivity of tensile behavior of composite material systems are being.

Energy absorption capability and scalability of square cross section composite tube specimens. U.S. Army Research and Technology Activity–AVSCOM, pp. 1 – Google Scholar.

The study of natural fiber reinforcement composite structures has focused the attention of the automobile industry due to the new regulation in relation to the recyclability and the reusability of the materials preserving and/or improving the mechanical characteristics. The influence of different parameters on the material behavior of natural fiber reinforced plastic structures has been.

Thin-walled structures with different cross-sectional shapes have obviously differences on the mechanical behavior. From single tube to multiple tubes, configuration such as square tube [10,11], circular tube [12,13], rectangular tube [14,15,16], pyramidal tube [], hexagonal tube [18,19], and conical tube [20,21] have been researched thin-walled structure with cross-sectional shapes.

Because the CFRP laminate was thick and the shape of the section was effective, energy absorption capability was increased. Shin et al. [22 K.C. Shin, J.J. Lee, K.H. Kim, M.C. Song, and J.S. Huh, Axial crush and bending collapse of an aluminum/GFRP hybrid square tube and its energy absorption capability, Comp.

Struct. 57 (), pp. – The plane angle is represented by ϕ, L is the characteristic length, and x is the Euclidean distance, which quantify macroscopic configuration between its folded and unfolded states. 64 b) Folding process of the square‐twist pattern.

48 c) Schematic of a self‐folding polymer‐gel trilayer square‐twist unit, where folding is actuated by. The precursor suspension was poured into a square tube with PDMS wedge mentioned above and then frozen using cryogenic ethyl alcohol.

After the precursor suspension was frozen entirely, the sample was tapped out of the mold and freeze-dried for more than 48 h at −60 °C with a freeze-dryer under mbar pressure (LabconcoKansas City.-: hrs.

SDM Lecture - Speaker: Earl H. Dowell, Professor, Duke University, Durham, NC • Monday, 12 April • hrs.Because of its nanoscale cross-section, electrons propagate only along the tube's axis.

As a result, carbon nanotubes are frequently referred to as one-dimensional conductors. The maximum electrical conductance of a single-walled carbon nanotube is 2 G 0, where G 0 = 2 e 2 / h is the conductance of a single ballistic quantum channel.