The exceptional properties of carbon fiber composites have positioned them as the material of choice for high-performance structural applications across industries. Carbon fiber possesses characteristics including high axial tensile strength, high modulus, good chemical stability, and good thermal stability, occupying an important position in the field of advanced composites. The global carbon fiber composites market was valued at USD 20.5 billion in 2024 and is estimated to grow at a CAGR of 10% to reach USD 53.6 billion by 2034. This growth reflects the increasing demand for lightweight, high-strength materials in aerospace, automotive, infrastructure, sports equipment, and renewable energy applications.

The materials science of carbon fiber composites has advanced significantly through modification and hybridization strategies. Carbon fiber hybrid composites combine carbon fibers with other fibers such as natural fibers, high-modulus carbon fibers, or high-performance synthetic fibers to achieve complementary performance, lightweight design, and cost optimization. The hybrid effect and mechanism, along with the influence of hybrid ratio and structural design on mechanical properties, have been systematically studied to optimize composite performance. Research status on carbon fiber hybrid composites has focused on mechanical properties and fatigue properties, with particular attention to impact properties and innovative applications in aerospace, engineering, and transportation.

High-performance structural composites are being developed for demanding applications where strength, stiffness, and weight are critical factors. The r-LightBioCom project has identified sustainable High-Performance Composite components ready for use case implementation, with applications in automotive, infrastructure, and aeronautics. These materials represent a paradigm shift in the way high-performance composites are manufactured and recycled, unlocking sustainable-by-design production of lightweight HPC. Environmental impact analysis of materials and recycling processes has demonstrated significant improvements in ecological performance, with up to 90% reduction in CO₂ emissions for some bio-based epoxy systems.

Additive manufacturing has emerged as a transformative technology for high-performance structural composites, offering unprecedented design freedom and material efficiency. Design optimization is increasingly recognized as a critical component for realizing the full potential of additive manufacturing for composite fabrication. Optimization tools enable engineers to predict material behaviors and develop effective composition placement strategies. Recent advances in design methodologies, ranging from density-based to level-set topology optimization approaches, have facilitated the fabrication of manufacturable prototypes. Furthermore, design objectives in existing studies have expanded beyond maximizing stiffness to achieving diverse multi-physical and functional properties.

The manufacturing of high-performance structural composites is being advanced through innovative processes that combine the benefits of different techniques. The AM-CM process developed by Oak Ridge National Laboratory combines additive manufacturing with compression molding to produce high-performance functional composite structures at automotive production rates. This process creates highly precise preforms by additively placing extruded fiber-filled polymers with controlled fiber orientations before undergoing secondary compression molding. The preforms can be in the form of short, long-chopped, or continuous fiber-filled thermoplastic polymers, enabling precise microstructural control and superior mechanical properties. As industries continue to demand higher performance and sustainability, carbon fiber composites and high-performance structural composites will remain central to engineering innovation.