Dear Joseph Ozigis Akomodi

Effects of microstructure on fatigue life of advanced composites :

• Fiber properties: Aligned, long fibers improve fatigue life; off-axis or short fibers reduce it. Higher fiber volume fraction generally helps, but too high can cause matrix cracking.
• Matrix: Tough, ductile matrices resist crack growth; brittle or poorly cured matrices shorten fatigue life.
• Fiber–matrix interface: Strong interfaces improve load transfer but may concentrate stress; weak interfaces can allow energy dissipation.
• Defects/voids: Porosity, microcracks, and delaminations act as crack initiation sites, reducing fatigue life.
• Environmental effects: Moisture, temperature, or chemical exposure can degrade the matrix/interface, accelerating fatigue.

Key point: Fatigue life depends on the synergy between fibers, matrix, interface quality, and defect content.

This is a very general question which is hard to answer. If you are interested, you might want to ask such questions on cdmHUB Community (https://community.cdmhub.org/), an AI-Human interactive technical forum. There are quite a few well-known composites experts who might be able to help you.

The ability of advanced composite materials to overcome breaking is wholly influenced by their structural configuration. Different elements such as fiber arrangement, bonds between fiber and matrix, and the material's trait distribution are integral in creating a force that reinforces the material against rupturing. The existence of irregularities, including air vacancies, over-resinized patches, and failed material integration can sustain such pressure. When the structural design facilitates an equal distribution of stress and robust fiber-to-matrix binding, the materials' ability to withstand fatigue increases, which results from materials that can bear multiple stresses and strains, improving them for applications with continuing similar circumstances. Therefore, attending to a material's structural design ensures heightened resistance to fatigue, thus increasing the effectiveness and robustness of composite materials.

More of Akomodi's AI.

Please be aware, Joseph in other posts has apparently faked citations to support his bias.

Google Scholar found none of your cites and searches specific articles failed Search of the Disability and Society journal volume 36 issue 4 table of contents at pages 567-582 failed to find the article you cited from this journal - Miller 2021.

https://www.tandfonline.com/toc/cdso20/36/4?nav=tocList

AND

Reading of the Psychology in the Schools journal volume 58 issue 7 table of contents at pages 1234-1247 failed to find the article you cited from this journal - Johnson et al. 2021.

https://onlinelibrary.wiley.com/toc/15206807/2021/58/7