Polymer Mechanics

, Volume 13, Issue 1, pp 52–58 | Cite as

Distribution of shearing stresses under three-point flexure in beams made of composite materials

  • Yu. M. Tarnopol'skii
  • I. G. Zhigun
  • V. A. Polyakov
Strength Of Structures

Conclusions

1. When short beams made of composite materials with span-to-height ratios within the 4.0–5.0 range are tested in three-point flexure, the profile of shearing stresses over the height of a beam cross section departs appreciably from a parabolic one over approximately 40% of the span length.

2. The zones of a perturbed state of stress, which appear in short beams tested in three-point flexure, render this method unusable for determining the interlayer shear strength of composite materials on "ultrashort" specimens.

Keywords

Shear Stress Composite Material Shear Strength Span Length Beam Cross Section 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Literature cited

  1. 1.
    Yu. M. Tarnopol'skii and T. Ya. Kintsis, Methods of Testing Reinforced Plastics Statically [in Russian], Moscow (1975).Google Scholar
  2. 2.
    Yu. M. Tarnopol'skii and A. V. Roze, Special Considerations in the Design of Parts Made of Reinforced Plastics [in Russian], Riga (1969).Google Scholar
  3. 3.
    S. P. Prosen and R. A. Simon, "Shear strength of graphite–fiber composites improved 300%," Reinforced Plastics and Composites World, No. 5, 20 (1967).Google Scholar
  4. 4.
    E.-M. Loene, M. Knight, and C. Schoene, "Preliminary evaluation of test standards for boron-epoxy laminates," Composite Materials: Testing and Design, ASTM STP 460, 122–139 (1969).Google Scholar
  5. 5.
    E. A. Rothman and G. E. Molter, "Characterization of the mechanical properties of a composite consisting of an epoxy matrix reinforced unidirectionally with carbon fiber," Composite Materials: Testing and Design, ASTM STP 460, 72–82 (1969).Google Scholar
  6. 6.
    J. V. Mulling and A. C. Knoell, "Basic concepts in testing composite beams," Mater. Res. Standards,10, No. 12, 16–20, 33 (1970).Google Scholar
  7. 7.
    K. Muzayama and R. Kamoto, "Methods of testing for the interlaminar shear strength of carbon fiber-reinforced plastics," Compos. Mater. Struc.,1, No. 2, 77–83 (1972).Google Scholar
  8. 8.
    K. T. Kedward, "On the short-beam test method," Fiber Sci. Technol.,5, No. 2, 85 (1972).Google Scholar
  9. 9.
    Yu. V. Nemirovskii and B. S. Reznikov, "Fracture mechanism in reinforced beams in flexure. Part 1. Fracture due to shear," Mekh. Polim., No. 2, 340–347 (1974).Google Scholar
  10. 10.
    S. G. Abramov and V. S. Ekel'chik, "Flexure of an orthotropic beam—wall," in: Properties of Glass-Plastics for Ship Construction and Methods of Their Measurement [in Russian], No. 3, Leningrad (1974), pp. 38–44.Google Scholar
  11. 11.
    L. M. Kachanov, "Separation in glass-plastic tubes under external pressure," Mekh. Polim., No. 6, 1106–1108 (1975).Google Scholar
  12. 12.
    L. M. Kachanov, "Fracture of composite materials through separation," Mekh. Polim., No. 5, 918–922 (1976).Google Scholar
  13. 13.
    V. S. Strelyaev and L. L. Sachkovskaya, "Effect of the deformation rate on the toughness of the grade 27–63S glass-plastic in shear," Mekh. Polim., No. 3, 557–560 (1975).Google Scholar
  14. 14.
    V. A. Polyakov and I. G. Zhigun, "Contact problem for beams made of composite materials," Mekh. Polim., No. 1, 63–74 (1977).Google Scholar
  15. 15.
    N. I. Bezukhov and O. V. Luzhin, Solution of Engineering Problems by the "Theory of Elasticity and Plasticity" Method [in Russian], Moscow (1974).Google Scholar
  16. 16.
    C. A. Berg, I. Tirosh, and M. Israeli, "Analysis of short beams made of fiber-reinforced composites," Composite Materials: Testing and Design, ASTM STP 497, 206–218 (1972).Google Scholar

Copyright information

© Plenum Publishing Corporation 1977

Authors and Affiliations

  • Yu. M. Tarnopol'skii
  • I. G. Zhigun
  • V. A. Polyakov

There are no affiliations available

Personalised recommendations