Multi-scale damage modelling in a ceramic matrix composite using a finite-element microstructure meshfree methodology

Area of Science:

• Materials Science
• Mechanical Engineering
• Computational Mechanics

Background:

• Multi-scale modeling is crucial for understanding composite material behavior.
• SiC ceramic composites are vital for high-temperature applications.
• Accurate representation of microstructure is key to predicting damage.

Purpose of the Study:

• To demonstrate the Finite-Element Microstructure Meshfree (FEMME) model's capability in multi-scale damage modeling.
• To integrate microstructural details like porosity and fiber tow behavior into component-level analysis.
• To validate the model against experimental data for SiC composite tubes.

Main Methods:

• Development and application of the FEMME model, coupling finite-element, cellular automata, and meshfree layers.
• Incorporation of microstructural features: porosity location/orientation/geometry, fiber tow load-carrying capability, and failure behavior.
• Experimental validation using X-ray computed tomography and digital volume correlation on axially loaded composite tubes.

Main Results:

• The FEMME model successfully introduced critical microstructural aspects into the larger scale component model.
• The model demonstrated the ability to predict quasi-brittle failure behavior influenced by microstructure.
• Comparison with experimental observations showed good correlation in damage development.

Conclusions:

• The FEMME model is effective for multi-scale damage assessment in SiC composite tubes.
• Further refinement of the model can enhance its fidelity to microstructural complexities.
• This approach advances the structural integrity analysis of advanced composite materials.