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Sunday, July 19, 2020 | History

3 edition of Scale effects on the transverse tensile strength of graphite epoxy composites found in the catalog.

Scale effects on the transverse tensile strength of graphite epoxy composites

Scale effects on the transverse tensile strength of graphite epoxy composites

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  • 27 Currently reading

Published by National Aeronautics and Space Administration, Langley Research Center, US Army Aviation Systems Command, Aviation R&T Activity in Hampton, Va, [St. Louis, Mo.] .
Written in English

    Subjects:
  • Composite materials.,
  • Epoxy compounds.

  • Edition Notes

    StatementT.K. O"Brien and S.A. Salpekar.
    SeriesAVSCOM technical report -- 92-B-009., NASA technical memorandum -- 107637., AVSCOM technical report -- 92-B-009., NASA technical memorandum -- 107637.
    ContributionsSalpekar, Satish A. 1954-, United States. Army Aviation Research and Technology Activity., Langley Research Center.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL14686537M

    Effects of the contact geometry on high strain rate failure behavior of woven graphite/epoxy composites are presented. Compressive split Hopkinson pressure bar was used for high strain rate experiments. Woven graphite/epoxy composites were loaded transversely using two different contact geometries at the impact energies of 67 J and J. Aoki et al. [27] also showed a decrease in tensile strength of carbon fiber/epoxy composites at À°C and found that crack initiation could occur at a lower load level than that at RT.

    Scale effects on the transverse tensile strength of graphite/epoxy composites. Composite Materials: Testing and Design. Composite Materials: Testing and Design. ASTM STP pp. 23 – This study presents a new experiment to image and analyze the evolution of transverse tensile fracture in tape-laminate carbon/epoxy composites at the microscale. To this end, a miniature double cantilever beam specimen is developed to produce stable transverse tensile fracture and various amounts of crack turning through a stack of 90° plies.

    The smallest configuration ( mm wide, span-to-thickness ratio of 3) consistently exhibited transverse tensile failures. A volume scale effect was difficult to discern due to the large scatter of the data. Static testing of 10 different specimens taken from a second panel produced a mean transverse tensile strength of MPa ( ksi). O'Brien TK and Salpekar SA. Scale effects on the transverse tensile strength of graphite/epoxy composites. In: Camponeschi E (ed.) Composite materials: testing and design. vol. 11, ASTM STP , , pp– Google Scholar.


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Scale effects on the transverse tensile strength of graphite epoxy composites Download PDF EPUB FB2

The influence of material volume on the transverse tensile strength of AS4/ graphite/epoxy composites was investigated. Tension tests of 90° laminates with three different widths and five different thicknesses were by: STP Scale Effects on the Transverse Tensile Strength of Graphite/Epoxy Composites.

Author Information: O'Brien, TK U.S. Army Research Laboratory, Vehicle Structures Directorate, NASA Langley Research Center, Hampton, VA. Salpekar, SA Analytical Services and Materials, Inc., Hampton, VA.

Get this from a library. Scale effects on the transverse tensile strength of graphite epoxy composites. [T Kevin O'Brien; Satish A Salpekar; United States. Army Aviation Research and Technology Activity.; Langley Research Center.].

sensitive scale effect was present in transverse tensile strength data generated using 90 degree tensile coupons. Tensile tests of AS4/ graphite epoxy were conducted using the procedure described in ASTM standard D where applicable.

This standard recommends a specimen width of inch and a specimenCited by: 17 Effects of Thermal Spiking on Graphite-Epoxy Composites ALFRED C.

LOOS AND GEORGE S. SPRINGER Department of Mechanical Engineering The University of Michigan Ann Arbor, Michigan (Received Novem ) ABSTRACT Tests were performed evaluating the effects of thermal spikes on the moisture absorption characteristics, the ultimate tensile strength, and the.

effects of specimen width on the tensile strength of aligned short-carbon-fiber reinforced epoxy composite laminates Conference Paper (PDF Available) July with 1, Reads How we measure.

Unidirectional composite specimens of boron/epoxy, graphite/epoxy, S-glass/epoxy and Kevlar/epoxy were tested at tensile strain rates of up to 27 m/m/sec. Longitudinal, transverse and in-plane.

The T graphite fiber was treated as transversely isotropic with E1 = Msi, E2 = Msi, ν12 =ν23 =G12 = 8 Msi, axial tensile strength = ksi, and compressive strength = ksi. The tensile stress-strain behavior of a variety of graphite/epoxy laminates was examined. Longitudinal and transverse specimens from eleven different layups were monotonically loaded in tension to failure.

Ultimate strength, ultimate strain, and stress-strain curves were obtained from four replicate tests in each. graphite/epoxy composites. These materials have been used to meet a wide variety of design param­ eters ranging from minimal weight to high struc­ tural stiffness requirements.

Because of their ability to meet many diverse design requirements simulta­ neously the use of graphite/epoxy composites is expected to increase. Tensile response of graphite/epoxy composites at low temperatures. also showed a decrease in tensile strength of CF/epoxy composites at − °C and discovered that crack initiation could occur at a lower load level than that at RT through measuring the the transverse CTE of a laminate specimen results in nonlinear behavior at low.

Abstract. The influence of material volume on the transverse tensile strength of AS4/ graphite epoxy composites was investigated. Tensile tests of 90 degree laminates with 3 different widths and 5 different thicknesses were conducted. These materials combine the strength, hardness and wear resistance of carbon with the corrosion resistance and self lubricating properties of graphite.

They can be impregnated with various materials to enhance its properties and used in applications where traditional lubrication is unsuitable. Experimental studies have shown that the dominant damage mechanism involved in transverse ply cracking is debonding occurring at the fibre matrix interface.The process is shown in Fig.

1a where the initial failure of a carbon fibre/epoxy system was examined by Hobbiebrunken et al., using in situ SEM was found that damage initiated through widespread fibre–matrix. Size effects on the tensile strength of composites. Size effects influence not only the strength of individual fibres, but also the longitudinal tensile strength and failure process of composite specimens and structures (Wisnom, ; Bazant, ).

BibTeX @INPROCEEDINGS{Army01influenceof, author = {Kevin Brien Army and T. Kevin O’brien and Arun D. Chawan and Kevin Demarco and Isabelle Paris}, title = {Influence of Specimen Preparation and Specimen Size on Composite Transverse Tensile Strength and Scatter}, booktitle = { 13 = 23 = G12 = GPa G13 = GPa G23 = GPa IM7/ Graphite/Epoxy Plain Weave.

O’Brien, T.K., Salpekar, S.A.: Scale Effects on the Transverse Tensile Strength of Graphite Epoxy Composites Rep. NASA TM NASA, Hampton () Google Scholar. The UD carbon/ epoxy composites, which were presented in Sectionhave been used to validate the proposed ve joints with a thickness of mm have been used to limit the edge effect.

Figure presents experimental results for shear loading tests (two results are presented: Comp 1 and Comp 2). For these tests we obtain a failure of the adhesive close to the adhesive.

@article{osti_, title = {The effect of graphite--epoxy composites on the galvanic corrosion of aerospace alloys. Final report, 1 Jan Apr [Be-Cu]}, author = {Miller, B.A.

and Lee, S.G.}, abstractNote = {The galvanic corrosion rates of selected aerospace alloys coupled to graphite-epoxy composite materials (GECM) in aerated neutral (pH7) % NaCl at 22+1 C have been studied.

The Effects of Tensile Preloads on the Impact Response of Carbon Epoxy. Differences in the Impact Response Mechanisms of Graphite Epoxy. remaining strength resin shear stress shown in Fig Society for Testing static stiffness strain stress levels stress ratio surface tensile strength Testing and Materials Titanium Matrix /5(2).

The influence of specimen polishing, specimen configuration, and specimen size on the transverse tension strength of two glass epoxy materials loaded in three and four point bending was evaluated. Polishing machined edges, and/or tension side failure surfaces, was detrimental to specimen strength characterization instead of yielding a higher, more accurate, strength as a result of removing.Figure 4: Tensile strength of composites Tensile Strength The effect of fly ash content on the tensile strength of the composite is shown in figure 4.

It is observed that the tensile strength varies from MPa to MPa. The tensile strength increases with the increase in fly ash upto 6grmas and thereafter it decreases.Effect of Temperature and Moisture on the Impact Behavior of Graphite/Epoxy Composites: Part II—Impact Damage.

A Statistical Analysis of Bushing, Sleeve, and Oversize Hole Effects on the Bolted Joint Strength of Graphite/Epoxy Laminates. Time-Dependent Behavior of a Graphite/Thermoplastic Composite and the Effects of Stress and Physical Aging.