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Sunday, July 26, 2020 | History

3 edition of A novel method of testing the shear strength of thick honeycomb composites found in the catalog.

A novel method of testing the shear strength of thick honeycomb composites

A novel method of testing the shear strength of thick honeycomb composites

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  • 21 Currently reading

Published by National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division, For sale by the National Technical Information Service in [Washington, D.C.], Springfield, VA .
Written in English

    Subjects:
  • Honeycomb structures -- Testing.,
  • Composite materials -- Testing.,
  • Shear (Mechanics),
  • Impact.,
  • Glass.,
  • Phenolic resins.,
  • Aluminum.,
  • Composite materials.,
  • Epoxy resins.,
  • Damage tolerance.,
  • Instrumented impact testing.

  • Edition Notes

    StatementA.J. Hodge and A.T. Nettles.
    SeriesNASA technical paper -- 3108.
    ContributionsNettles, A. T., George C. Marshall Space Flight Center.
    The Physical Object
    FormatMicroform
    Paginationiv, 10 p.
    Number of Pages10
    ID Numbers
    Open LibraryOL16109845M

    Session T1: Test Methods I. An Experimental Investigation of the Effect of a Negative Through-the-Thickness Poisson’s Ratio on Patch Repairs; A New Test Method in Determining the Mohr-Coulomb Friction Factor and Transverse Shear Strength of Thick-Section Composites; Tensile Scaling Effects in Notched Composites.   This is why it is important to use a core with high transverse shear modulus and strength such as honeycomb to absorb these transverse shear loads. Furthermore, the core transverse shear strength is important for resisting point or distributed pressure loadings over the surface of the face sheets and give local support for fasteners.

    The analytical analysis reveals that a Taiji honeycomb has times higher strength in compression and times higher strength in shear compared with a traditional hexagonal honeycomb. Considering the strength-weight issue, the novel structure also displays an increase in compression strength of times and shear strength of by: 2. 1 INVESTIGATION OF DIFFERENT GEOMETRIC STRUCTURE PARAMETER FOR HONEYCOMB TEXTILE COMPOSITES ON THEIR MECHANICAL PERFORMANCE A thesis submitted to the University of.

    Greszczuk L. B., New test technique for shear modulus and other elastic constants of filamentary composites, Symposium on Test Methods, ASTM, Dayton, 21–23 September , Paper 3, pp. 95–, AD Google ScholarCited by: 3. V-notched shear testing of composites. Dr. Daniel O. Adams, professor of mechanical engineering and director, for 18 years, of the Composite Mechanics Laboratory at the University of Utah, and VP of Wyoming Test Fixtures Inc. (Salt Lake City, UT, US), reviews the most popular V-notched shear test methods for composite materials.


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A novel method of testing the shear strength of thick honeycomb composites Download PDF EPUB FB2

A NOVEL METHOD OF TESTING THE SHEAR STRENGTH OF THICK HONEYCOMB COMPOSITES I. INTRODUCTION Determination of the shear strength of a honeycomb core and carbon-fiber facing composite is normally performed utilizing the American Society for Testing Materials (ASTM) standard ASTM C, "'Shear Test in Flat Sandwich Constructions or Sandwich Cores."File Size: KB.

Sandwich composites of aluminum and glass/phenolic honeycomb core were tested for shear strength before and after impact damage. The assessment of shear strength was performed in two ways; by four point bend testing of sandwich beams and by a novel double lap shear (DLS) test.

A novel method of testing the shear strength of thick honeycomb composites / By A. Hodge, A. (Alan T.) Nettles and George C. Marshall Space Flight Center.

Abstract. Sandwich composites of aluminum and glass/phenolic honeycomb core were tested for shear strength before and after impact damage. The assessment of shear strength was performed in two ways; by four point bend testing of sandwich beams and by a novel double lap shear (DLS) : A.

Nettles and A. Hodge. The investigation was concentrated on the through-thickness properties of thick-composite laminates, and the development of a novel test method and several specimens with two different shapes and three to four different sizes.

The experiments were performed on thick composite specimens; and all through-thickness mechanical properties under compressive and tensile Cited by: 1. A novel hierarchical thermoplastic composite honeycomb cylindrical structures (HTCHCS) with recyclability were designed and fabricated using interlocking assembly technique.

The quasi-static axial compression tests were conducted to investigate the mechanical response and energy absorption of by: 8. A Novel Method for the Pushout Test in Composites Rebecca Sinclair and Robert J.

Young Manchester Materials Science Centre, UMIST/University of Manchester, Grosvenor Street, Manchester, M1 7HS UK. SUMMARY: The indentation or pushout test is a widespread method of evaluating composite interfaces. of composite sandwich plates like those of the walls of the test cylinders and on (2) plastic buckling of sandwich cylinders in compression.

two studies are compared with observed behavior of the test cylinders. bending stiffness of the test cylinders correlated well with predicted behavior. Method losipescu, ASTM Standard Approved by D Committee Short Beam Shear, ASTM D, SACMA SRM Other Table 2. Status of Interlaminar Shear Test Methods Status Rank Thick specimens with bonded layers required.

Appears 1. to be the best choice for unidirectional or fabric com- posites. Nonuniformities in the stress state plague both methods. The 10° Off-Axis Test of a unidirectional composite does not exhibit a pure stress state Plate Twist does not provide shear strength, which limits it usefulness.

Thus, a summary of shear test methods is relatively simple. Get this from a library. A novel method of testing the shear strength of thick honeycomb composites. [A J Hodge; A T Nettles; George C. Marshall Space Flight Center.]. First, an experimental benchmark study was made of different designs for the shear testing of honeycomb cores.

Then, several test specimens were fabricated and tested, a 3D DIC system being used to measure and record the displacements. One is Test Method A which involves Roller-Type Thickness Tester and the second method is Test Method B which involves Disk-Type Thickness Tester.

CORE FLEXURAL SHEAR PROPERTIES. The test method ASTM C determines flexural strength, core shear strength of the core material used in hybrid sandwich panel : Sandesh Kiran. S, B. M Rajaprakash. Some limitations of the model were also found, as a shear strength limit needs to be incorporated in a complete prediction of failure loads of the sandwich panels.

Keywords: Cabin Interiors, Composite Materials, Compressive Failure, Compressive Strength, Core Shear, Face Sheet Debonding, Flexural Strength, Four-point Bend Test, Glass Fiber Fabric,Author: Nicholas Bruffey, William Shiu.

AlAl and of Glass Fiber Facing Honeycomb sandwich panels. Five type of Honeycomb Sandwich Panels were used in the test. Thick Core = mm (Al, Al, Two Type of Glass Fiber Facings) Thin Core = mm (Al Facings) Test # 01 (Flat wise Compressive Strength). A new in-plane shear-test methodology, developed for laminated composite materials, was extended to textile composites.

The methodology incorporates two recently developed advances: a new specimen and a special strain gage. When used together, they produce accurate and consistent shear characterization of laminated and textile composite by: Experimental and numerical investigations were conducted to characterize the joint strength and failure modes in adhesively bonded double lap shear type specimens.

As bonded joints are more efficient when designed for pure shear, the used specimens consisted of double lap joints to be used for moderately thick to thick foam core sandwich : Dragos Alexandru Apostol, Dan Mihai Constantinescu, Marin Sandu, Adriana Sandu, Florin Stuparu.

axis) were obtained by means of flexural and pure compression tests. The out-of-plane shear modulus was obtained by means of a rail-shear test. The second core material used was a PVC closed-cell foam (Divinycell H). The material was tested under tension, compression and shear.

The adhesive used to bond the facings to the honeycomb core was File Size: KB. The test does not produce pure shear, but the specimen length is prescribed so that secondary stresses have a minimum effect. Approximate shear properties can also be obtained from a sandwich flexure test (see Test Method C ).

This test method provides a standard method of obtain-ing sandwich core shear data for quality control. The test method used, ASTM Callows the determination of shear properties of sandwich constructions or cores, associated with shear distortion of planes parallel to the facings.

As for other shear tests developed in recent years, the objective is to maximise shear stress and minimise extraneous induced stresses in the specimen [9].Cited by:.

Test Method C/CM may also be used to determine core shear strength. Standard Practice D/DM may be used to calculate the flexural and shear stiffness of sandwich beams. This test method can be used to produce facesheet strength data for structural design allowables, material specifications.COMPOSITES HANDBOOK Preface The global nature of today’s reinforced plastics industry creates a demand from all over the world, for basic background information.

This sixteenth edition of the Composites Handbook provides an introduction to reinforced plastic in terms of basic chemistry, resins, reinforcements and application Size: 1MB. Abstract. The purpose of this study was to develop and validate a novel method for measuring shear deformation during the Thick Adherend Shear Test (TAST), to determine in situ mechanical properties of an adhesive under tensile shear loading, using two-dimensional (2D) Digital Image Correlation (DIC).

Shear strains were optically measured using DIC from Author: Jared Van Blitterswyk, David Backman, Jeremy Laliberté, Richard Cole.