Title page for ETD etd-11292012-040047

Type of Document Master's Thesis
Author Ifju, Peter G.
URN etd-11292012-040047
Title New in-plane and interlaminar shear test methods for fiber reinforced composites
Degree Master of Science
Department Engineering Science and Mechanics
Advisory Committee
Advisor Name Title
Post, David Committee Chair
Czarnek, R. Committee Member
Smith, Charles W. Committee Member
  • Fibrous composites
Date of Defense 1989-06-05
Availability restricted
A new compact double-notched specimen for in-plane shear testing of isotropic,

anisotropic and composite materials was developed. A preliminary test of the specimen

was performed on a cross-ply laminate. High sensitivity moire interferometry was used to

determine the shear and normal strains on the entire face of the specimen. The results of

the test were compared to those of the Iosipescu specimen on the same material. The

compact specimen produced a more uniform and more pure shear distribution than the

Iosipescu specimen. Stiffness measurements of the composite material were made. A

detailed investigation of the specimen was performed and it revealed important attributes

and deficiencies of the specimen. Recommendations for future work are cited.

The interlaminar shear response of a cross-ply composite was investigated. Shear

strains on a ply—by—ply basis were measured using moire interferomety. Qualitative and

quantitative information of the interlaminar shear characteristics of the material were

obtained. The interlaminar shear modulus of individual plies and the effective modulus for

the laminate were determined. Variations of nominally equal plies were observed.

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