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Journal of Composite Materials
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On the Displacement Field for Unidirectional Off-Axis Composites in 3-point Flexure - Part II: Numerical and Experimental Results

F. Mujika

Departamento de Ingeniería Mecánica, Avda. Felipe IV, 20011 San Sebastián/Donostia, Spain impmugaf{at}sp.ehu.es

A. De Benito

I. Mondragon

Departamento de Ingeniería Química y del Medio Ambiente, Escuela de Ingeniería Técnica Industrial, Universidad del País Vasco/Euskal Herriko Unibertsitatea, Avda. Felipe IV, 20011 San Sebastián/Donostia, Spain

The displacement field calculated in Part I of this work is numerically analysed for specimens of IM7-8552 epoxy matrix based carbon fiber reinforced unidirectional composite material. Three-point tests have been performed in 5 specimens with different fiber orientation, using 10 spans for each specimen. Theoretical displacement fields obtained in Part 1 have been used for showing level curves on supports and load cylinder lines, in order to analyse the suitability of assumptions concerning boundary conditions and load application. Middle point load-displacement curve slopes obtained from displacement field equations and from Classical Laminated Beams Theory are compared with experimentally obtained results. On the other hand, in-plane shear modulus has been calculated in different ways, knowing the other elastic constants of the material and the experimental load-displacement curve slope. The agreement between numerical and experimental results is rather good in all cases.

Key Words: flexure test • off-axis composites • in-plane shear modulus

Journal of Composite Materials, Vol. 37, No. 13, 1191-1217 (2003)
DOI: 10.1177/0021998303037013004
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F. Mujika, A. Valea, P. Ganan, and I. Mondragon
Off-axis Flexure Test: A New Method for Obtaining In-plane Shear Properties
Journal of Composite Materials, June 1, 2005; 39(11): 953 - 980.
[Abstract] [PDF]