On matrix crack growth in quasi-isotropic laminates—I. Experimental investigation

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Abstract

Matrix crack growth behaviour under quasi-static and mechanical fatigue loadings has been studied in quasiisotropic (0/90−45/ + 45)s GRP laminates. Detailed experimental observations were made on the initiation and growth of individual cracks in ± 45 ° and 90 ° plies. Degradation of elastic properties of the laminates due to matrix cracking was observed and recorded. The quasistatic results were compared with baseline data from a crossply (090)s laminate. Distinctly different crack growth behaviour was observed in quasi-isotropic laminates under quasi-static and fatigue loadings, suggesting a strong influence of load history. A higher density of ± 45 ° cracks and hence greater stiffness reduction appear to be the characteristics of fatigue damage in quasi-isotropic laminates.

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