Advertisement

Experimental Mechanics

, Volume 30, Issue 2, pp 184–189 | Cite as

Analytical and experimental evaluation of double-notch shear specimens of orthotropic materials

  • P. Dadras
  • J. S. McDowell
Article

Abstract

A finite-difference analysis of the state of stress in a double-notch interlaminar shear strength specimen is developed. The effects of geometry and material parameters on the stress distributions are investigated. It has been found that, in agreement with previous determinations,1–7 a uniform distribution of shear stress on the fracture plane does not exist. The shear stress distribution becomes more uniform for increased material anisotropy and for small (L/T) ratios, whereL is the distance between the notches andT is the specimen thickness. Also, it has been determined that the notch size (W) and the distance from the notches to the loaded ends of the specimen (h) do not influence the stress distributions significantly.

The effects of variations in the (L/T) ratio, the notch size (W), and the length (h) were investigated experimentally. For a graphite/epoxy laminate of 0/90-deg square wave it has been found that the apparent shear strength determined by double-notch shear tests decreases significantly with an increase in (L/T) ratio. The decrease in the apparent shear strength with an increase inh, however, is very small. Also, the apparent shear strength is not affected significantly by increasing the notch sizeW.

Keywords

Anisotropy Shear Stress Fluid Dynamics Shear Strength Stress Distribution 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Iosipescu, N., Rev. de Mec. Appl.,8 (1),145 (1963).Google Scholar
  2. 2.
    Iosipescu, N., J. Mat., ASTM,2 (3),537 (1967).Google Scholar
  3. 3.
    Elkin, R.A., Fust, G. and Hanley, D.P., Composite Materials: Testing and Design, STP 460, ASTM, Philadelphia (1969) Google Scholar
  4. 4.
    Markham, M.F. and Dawson, D., Composites, 173–176 (July 1975).Google Scholar
  5. 5.
    Chiao, C.C., Moore, R.L. and Chiao, T.T., Composites, 161–169 (July 1977).Google Scholar
  6. 6.
    Herakovich, C.T., Bergner, H.W. and Bowles, D.E., Test Methods and Design Allowables for Fibrous Composites, ASTM STP 734, ed. C.C. Chamis, 129–151 (1981).Google Scholar
  7. 7.
    Bergner, H.W., Davis, J.G. and Herakovich, C.T., Analysis of Shear Test Methods for Composite Laminates, VPI-E-77-14, Virginia Polytechnic Inst. and State Univ. (April 1977).Google Scholar
  8. 8.
    Lekhnitskii, S.G., Theory of Elasticity of an Anisotropic Body, MIR Publishers, Moscow (1981).Google Scholar
  9. 9.
    Ugural, A.C. andFenster, S.K., Advanced Strength and Applied Elasticity, 2nd SI Ed., Elsevier, New York (1987).Google Scholar

Copyright information

© Society for Experimental Mechanics, Inc. 1990

Authors and Affiliations

  • P. Dadras
    • 1
  • J. S. McDowell
    • 2
  1. 1.Mechanical and Materials EngineeringWright State UniversityDayton
  2. 2.Kaiser AerotechSan Leandro

Personalised recommendations