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Geometry-mediated transition and competing mechanisms of bending failure in ceramic matrix composite T-joints
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DOI：10.1016/j.compositesb.2026.114058.png)
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Abstract
En 中文
The bending failure of ceramic matrix composite T-joints is governed by the competition among filler cracking, interfacial delamination, and intralaminar damage, while the role of geometric parameters in triggering dominant failure-mode transition remains unclear. In situ bending tests combined with digital image correlation (DIC) and acoustic emission (AE) were performed on T-joints with different filler radius and laminate thicknesses, together with a two-dimensional progressive damage model accounting for intralaminar failure, interfacial delamination, and brittle cracking in the triangular filler region. The results reveal a pronounced geometry dependence of the failure response. Small filler radius and thin laminates tend to induce filler-dominated brittle failure, whereas increasing the filler radius or laminate thickness drives damage migration from the filler region to the interface, leading to crack deflection and delamination-dominated propagation. The proposed model captures the experimentally observed crack initiation, propagation trajectory, and load-displacement response. More importantly, it clarifies that geometric parameters do not merely alter stress magnitude, but regulate the final failure path and structural load-carrying capacity by reshaping the local stress-field topology and the energy competition among multiple damage mechanisms. A semi-empirical dimensionless descriptor is further introduced to organize the combined geometric effects within the investigated parameter range. These findings provide a mechanistic basis for the strength design and damage-tolerant optimization of joining structures for high-temperature applications.
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