2D/3D OXIDE/OXIDE CERAMIC MATRIX COMPOSITES LIFE PREDICTION METHODS, VIRTUAL CHARACTERIZATION OF MECHANICAL PROPERTIES, AND VIRTUAL TESTING OF STRUCTURAL COMPONENT

摘要

Progressive failure analysis (PFA) method was employed to investigate the material and sub-element performances made of Alumina/Alumina (N720/A) ceramic matrix composites (CMC). A numerical material characterization was performed to derive the composite constituent properties based on the tested in-plane tensile and compressive properties of the 2D CMC. The derived constituent properties were then applied to the simulations of the 2D composite other properties including in-plane shear, inter-laminar shear and tension, in-plane bending and biaxial tension. The 3D composite in-plane and inter-laminar tensile behaviors were also predicted using the constituent properties. Finally, the simulation procedure was applied to the life prediction of a sub-element fabricated from the 2D N720/A CMC. The simulation results agreed well with the Siemens test data, which indicates the constituent properties can account for their realistic behaviors in the N720/A CMC. In addition, simulations also provided detailed information of stress fields, damage development and failure mechanisms involved in each specimen.