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Journal of Composite Materials
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Off-axis Flexure Test: A New Method for Obtaining In-plane Shear Properties

F. Mujika

Mechanical Engineering Department; EUP, Universidad del País Vasco/Euskal Herriko Unibertsitatea, Plaza de Europa 1, 20018 San Sebastián/Donostia, Spainimpmugaf{at}sp.ehu.es

A. Valea

Chemical and Environmental Engineering Department; EUITI, Universidad del País Vasco/Euskal Herriko Unibertsitatea, La Casilla 3, 48012 Bilbao, Spain

P. Gañán

Universidad Pontificia Bolivariana, Grupo Nuevos Materiales, Medellín 56006, Colombia

I. Mondragon

Chemical and Environmental Engineering Department; EUP, Universidad del País Vasco/Euskal Herriko Unibertsitatea, Plaza de Europa 1, 20018 San Sebastián/Donostia, Spain

Off-axis three-point flexure test for unidirectional composites is proposed as a new method for obtaining in-plane shear modulus and in-plane shear strength. The method of determination of the in-plane shear modulus GLT has been explained in a previous work where the displacement field of an off-axis flexure test was analyzed. In the present work, besides summarizing the calculation equations of GLT, the condition of small displacements is analyzed. Otherwise, an error analysis is carried out in order to study the influence of the calculated value of GLT on the other elastic parameters.

Normal and shear stresses in the fiber–matrix interface change from point to point in the specimen depending on the fiber orientation angle and specimen geometry. A critical point of failure that depends on the fiber orientation angle is determined and optimum conditions for obtaining in-plane shear strength are discussed. Experiments for different fiber orientations and geometric conditions have been carried out for IM7/8552 epoxy matrix based carbon fiber reinforced unidirectional composite material.

Key Words: in-plane shear strength • in-plane shear modulus • off-axis flexure • unidirectional composite

Journal of Composite Materials, Vol. 39, No. 11, 953-980 (2005)
DOI: 10.1177/0021998305048735
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