High-temperature tensile behavior and failure mechanism of 2D woven Al₂O_3f/Al₂O₃ composites with multiscale study

For 2D woven Al₂O₃_f/Al₂O₃ composites, prior studies have not incorporated high-resolution 3D void statistics into mechanical models, and the microstructure failure mechanism at room and high temperatures have not been sufficiently studied. Regarding these issues, this paper systematically combines high-resolution micro-computed tomography (μ-CT) quantified void characteristics, digital image correlation (DIC) tensile tests up to 1100 °C and multiscale numerical simulations. The microstructure was characterized by μ-CT, and the geometry, proportion and distribution of the multiscale voids were quantified by a 3D μ-CT model. Tensile behavior and strain field evolution of the composites were revealed by experiments and DIC at temperature up to 1100 °C. The damage evolution at room temperature and 1100 °C was modeled by microscale and mesoscale numerical models with multiscale void characteristics. Finally, this study elucidated the synergistic behavior of the fiber-matrix-void multiphase system and failure mechanisms of the Al₂O_3f/Al₂O₃ composites at room and high temperatures.