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}12 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 orthotopic laminates with reasonably good accuracy.
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