Compressive Properties of CFRP Cross-Ply Laminates with Multiple Delaminations.

概要

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Significant reduction of compressive buckling and postbuckling properties of composite cross-ply laminate owing to multiple delaminations is studied experimentally and analytically. Through-width multiple delaminations with equal length are considered. In the analysis, Timoshenko type beam theory is adopted. An analytical method is formulated on the basis of the Rayleigh-Ritz approximation technique, where the deflection and rotation of the crosssection are developed with the use of global mode functions and local mode functions which are not zero only on the delaminated portion. In order to conduct the eigen-value problem, closed delamination is assumed. The agreement of the analytical results with the experimental ones is excellent. The degradation of the compressive properties of crossply laminate due to the multiple delaminations is more serious than the homogeneous materials such as woven-cloth laminate. The simple method of the estimation of energy release rate is proposed, which is consistent with the experimental results. The delamination instability point can be estimated with the value.
社団法人日本航空宇宙学会の論文