New Perspectives for Material Characterization and Structural Diagnostics of Composites

摘要

This work presents some recent development in methods and plans for materialrncharacterization and structural diagnostics of composites used in aerospacernapplications. Accurate and efficient full three-dimensional characterization of thernmechanical properties of carbon and glass-fiber reinforced polymer-matrix compositernmaterials, essential for understanding their complex deformation and failurernmechanisms, is challenging due to anisotropy of the material properties includingrnstress-strain curves and strength characteristics in three dimensions. In this work,rndigital correlation (DIC) based methods for characterization of composites arerndiscussed. Such methods enable characterizing multiple nonlinear material stressstrainrnrelations up to failure in a single experiment. Also, advances in structuralrndiagnostics, including accurate 3D measurement of defect location and size withrnautomated transition to structural finite element models, are summarized.rnTechnologies enabling the shift to 3D measurement based on X-ray computedrntomography (CT) for assessing manufacturing defects in composite structures arerndiscussed.