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A method of testing thin webs in shear

Paper discusses the problems associated with in-plane shear testing of thin webs and describes a method of measuring shear strengths and moduli of thin materials

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Abstract

This paper describes a method for measuring the shear strengths and moduli of foils, films, fabrics and papers as thin as a fraction of one mil. The technique involves the use of two steel loading plates, to which the edges of the specimen are adhesively bonded, and a stabilizing system which prevents the specimen from buckling before shear yield strengthis reached. The practicality of the method is demonstrated on aluminum foil, as thin as 0.9 mil, by duplicating handbook values. Repeatability of results is verified by scatter within 2 percent in strength and 4 percent in modulus. The applicability of this method to several boron and glass-fiber composites is then shown.

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Abbreviations

D :

plate bending stiffness

E :

modulus of elasticity for plate with in-plane isotropy

E 0 :

modulus of elasticity in principal direction for orthotropic plate

E 90 :

modulus of elasticity in transverse direction for orthotropic plate

E 45 :

modulus of elasticity in bias direction for orthotropic plate

G :

shear modulus

N xy :

in-plane shearing force per unit length

a :

long side of plate

b :

short side of plate

k :

shear-buckling coefficient

t :

plate thickness

v :

Poisson's ratio for plate with in-plane isotropy

v 0-90 :

Poisson's ratio in principal direction for an orthopropic plate

v 90-0 :

Poisson's ratio in transverse direction for an orthotropic plate

σY :

yield stress for plate with in-plane isotropy

σ0 :

yield stress in principal direction for an orthotropic plate

σ90 :

yield stress in transverse direction for an orthotropic plate

σ45 :

yield stress for bias direction for an orthotropic plate

τ xy :

in-plane shear stress

τY :

yield stress in shear

τ cr :

buckling stress in shear

References

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  6. Hearmon, R. F. S., An Introduction to Applied Anisotropic Elasticity, Oxford University Press, London (1961).

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  7. Tsai, S. W., “A Test Method for the Determination of Shear Modulus and Shear Strength,” AFML-TR-66-372 (Jan. 1967).

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Authors and Affiliations

  1. TRW Systems, Inc., 90278, Redondo Beach, Calif

    M. M. Balaban (Staff Engineer)

  2. Hexcel Corporation, 94566, Dublin, Calif

    W. T. Jackson (Senior Project Chemist)

Authors
  1. M. M. Balaban
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  2. W. T. Jackson
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Balaban, M.M., Jackson, W.T. A method of testing thin webs in shear. Experimental Mechanics 11, 224–227 (1971). https://doi.org/10.1007/BF02324219

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  • DOI: https://doi.org/10.1007/BF02324219

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