Experimental method for determination of bending and torsional rigidities of advanced composite laminates

Book · Wed Nov 01 04:00:00 EST 1995

OSTI ID:122548

Maeda, Takenori ^[1]

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1. Univ. of Tsukuba, Ibaraki (Japan). Institute of Engineering Mechanics

This paper presents an experimental method for the determination of the bending and torsional rigidities of advanced fiber composite laminates with the aid of laser holographic interferometry. The proposed method consists of a four-point bending test and a resonance test. The bending rigidity ratio (D{sub 12}/D{sub 22}) can be determined from the fringe patterns of the four-point bending test. The bending rigidities (D{sub 11} and D{sub 22}) and the torsional rigidity (D{sub 66}) are calculated from the natural frequencies of cantilever plates of the resonance test. The test specimens are carbon/epoxy cross-ply laminates. The adequacy of the experimental method is confirmed by comparing the measured rigidities with the theoretical values obtained from classical lamination theory (CLT) by using the measured tensile properties. The results show that the present method can be used to evaluate the rigidities of orthotropic laminates with reasonably good accuracy.

• OSTI ID: 122548
• Report Number(s): CONF-950740--; ISBN 0-7918-1333-9
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPOSITE MATERIALS
ELASTICITY
EXPERIMENTAL DATA
FLEXIBILITY
MEASURING METHODS
MECHANICAL PROPERTIES
MECHANICAL TESTS