I. Core Breakthroughs

Breakthrough 1 : Building a holistic dimension CFRP An integrated knowledge system that breaks down the silos of information across specialized domains.

Previous studies have largely focused on a single material, a single process, or a single property. By integrating seven key domains—carbon fiber precursors, resin systems, forming and manufacturing, multi-scale mechanics, multifunctional characteristics, industrial applications, and life-cycle analysis—this paper establishes a comprehensive, closed-loop framework. It also quantifies the mechanical retention rates of various processing techniques, providing clear benchmarks for material selection and comparison, thereby addressing the challenge engineers face in piecemeal literature reviews.

Breakthrough 2 : Quantitative classification of forming process performance, establishing an intuitive reference standard for process selection.

An innovative approach to systematically quantify the tensile strength retention rate of all mainstream manufacturing processes: autoclave. 98% > AFP95% > ATL93% > Autoclave-free process 92% > Entanglement 90 > RTM85% > 3D Print 80 ＞Hand lay-up 70 Using standardized metrics to clearly differentiate process performance, companies can swiftly align manufacturing routes with considerations of performance, cost, and throughput.

Breakthrough 3 : Clarifying the anisotropic underlying mechanisms and engineering design mitigation strategies

Fully elucidates how ply orientation, fiber volume fraction, and manufacturing defects synergistically govern the orthotropic mechanical behavior of composite materials, and provides a quantitative characterization. 0°/±45°/90° The strength, modulus, and fatigue behavior of laminates vary; the degradation mechanisms of transverse and shear properties induced by porosity and fiber misalignment are elucidated, providing a theoretical foundation for laminate topology optimization and failure simulation.

Breakthrough 4 : Synchronize and organize the structure + Two Major Development Pillars of Multifunctionality

Unlike conventional reviews that focus solely on mechanical properties, this paper integrates structural performance with multifunctional attributes such as friction, thermal conductivity, sensing, and impact resistance. It systematically summarizes approaches for achieving multifunctionality in composite materials through nano‑fillers and interfacial modifications, thereby bridging the research continuum from structural materials to smart materials.

Breakthrough 5 : Thoroughly organize CFRP Pain Points Across the Entire Lifecycle and Sustainable Solutions

The system compares the advantages and disadvantages of three major recycling processes—mechanical, pyrolysis, and solvent-based—and quantifies the carbon‑reduction benefits of bio‑based resins, self‑healing systems, and recycled fibers. It also provides a comprehensive analysis of the degradation mechanisms underlying hygrothermal aging and interfacial failure, thereby offering a clear technical roadmap for the industrialization of green composite materials.

II. Technological Innovation

Innovation 1 : A refined classification system for carbon fibers and matrix materials

• Carbon fiber classification: by PAN / Asphalt /  Viscose precursor and heat‑treatment temperature are used to classify fibers into five major categories—ultra‑high modulus, high modulus, medium modulus, high strength, and ultra‑high strength—and the influence of the microstructural graphitic layer on mechanical toughness as well as electrical and thermal conductivity is analyzed. The regulatory mechanisms by which surface grooves and roughness govern interfacial adhesion are elucidated, and methods for sizing, plasma treatment, and electrochemical surface modification are summarized.
• Resin classification into two categories: thermosets (primarily epoxy, with high modulus, corrosion resistance, and non-recyclable) and thermoplastics ( PEEK/PA/PP , which can be melt‑repaired and recycled), compile a comparative table of the density, modulus, and strength of mainstream thermoplastic resins, and clearly define the selection criteria for choosing between the two types of matrix materials based on their respective application scenarios;
• Comprehensive elucidation of interfacial mechanisms: The interface serves as the core for load transfer, systematically explaining the failure mechanisms of interfacial debonding and fiber pull-out, and providing a complete suite of modification strategies to enhance interlaminar shear strength.

Innovation 2 : Standardized Comparison Framework for Forming Processes Across All Product Categories

• Covering five major process categories: traditional hand lay-up, closed-mold infusion, hot-press molding, automated fiber placement, and additive manufacturing.
• Traditional processes: hand lay-up, filament winding, RTM/VARTM , analyze the advantages and disadvantages of cost, porosity, and fiber content;
• Thermosetting system: Autoclave (the aerospace gold standard, porosity < 1% ), without an autoclave OOV Vacuum process (low-cost, large parts);
• Automated Process: AFP/ATL Robot-assisted placement enables the fabrication of curved preforms with variable curvature and stiffness.
• Continuous fiber 3D Printing: Rapid fabrication of free‑form complex structures, with an analysis of the current limitation of low fiber volume fraction.
• A quantitative comparison of the uniform strength retention rates is provided, establishing a rapid decision‑making basis for process selection.

Innovation 3 : Comprehensive Quantitative Analysis of Multiscale Mechanics and Functional Performance

• Mechanical system: Quantification of unidirectional laminate anisotropy data, with systematic analysis of tension, compression, in‑plane shear, and low‑velocity impact ( BVID ), CAI Post‑impact compression and fatigue failure mechanisms; elucidation of the linear degradation relationships of transverse and shear properties induced by porosity and fiber misalignment.
• Summary of toughening techniques: rubber particles, nano-fillers, Z The four major approaches—fiber reinforcement, interlayer toughening, and others—quantify the extent to which each type of modification enhances residual compressive strength.

Multifunctional Performance:

• Tribology: Carbon nanosheets and titanium dioxide fillers form a lubricating transfer film, significantly reducing wear.
• Thermodynamics: Based on the anisotropic thermal conductivity—high along the fiber direction and low through the thickness—propose a thermal‑conductivity modification strategy.
• Durability: A comprehensive analysis of the entire process of matrix plasticization and interfacial hydrolytic degradation under humid and acidic–alkaline conditions.

Innovation 4 Frontier Systems for Smart Composites and Digital Manufacturing

• Nanofunctional modification: Doping with carbon nanotubes and graphene enables integrated self-sensing, electromagnetic shielding, and thermal conductivity.
• Classification of self-healing composites: microencapsulation–based exogenous repair and intrinsic self‑healing via dynamic covalent bonds, with a comparison of their repair cycle lifetimes.
• Digital Twin Manufacturing: AFP Online monitoring, multi-scale finite element analysis, AI Process optimization integration, achieving “ One-time molding pass rate ”  Smart manufacturing.

Innovation 5 Complete Technological Roadmap for Sustainable Composite Materials

• Quantitative comparison of the advantages and disadvantages of three major recycling processes: mechanical recycling (low cost, short fibers), pyrolysis (retains medium‑to‑strong fibers), and supercritical solvent chemical recycling (preserves fiber strength). 90% The above);
• Green materials: lignin-based bio‑spun yarn, bio‑based epoxy, and thermosetting resins with dynamic crosslinking;
• Full lifecycle LCA Carbon‑reduction data quantifies the environmental benefits of recycled composites and self‑healing systems.

III. Application Scenarios

• Aerospace (Core High-End Applications)

Civil airliner fuselages and wings, stealth structures for military aircraft, satellite payload shells, and hypersonic demonstrator vehicles; leveraging high specific strength, low thermal expansion, and excellent fatigue resistance to reduce weight and extend range, while multifunctional composite materials enable integrated structural‑stealth functionality. 700 The proportion of composite materials in military aircraft has reached 35% That is all.

• New Energy Vehicles and the Racing Industry

F1 / Supercar monocoque cockpit, new‑energy battery pack frame, and crash beams; leveraging lightweight design to extend range, with controllable energy absorption in low‑speed impacts, balancing safety and weight reduction; thermoplastic composites compatible with production lines for rapid thermoforming and mass production.

• Wind power clean energy equipment

Carbon-fiber/glass-fiber sandwich structure of the wind turbine main beam, 70m The above ultra-long blades significantly reduce blade self-weight, decrease tower fatigue loads, and enhance the performance of offshore wind turbines. 20  Long service life and reduced operation and maintenance costs; 700 bar High-pressure hydrogen storage cylinder ( Type IV ) Core winding material.

• Medical and Sports Equipment

Lower-limb carbon-fiber energy‑storage prostheses, lightweight sports helmets, and snowboards; bio‑stable with excellent cyclic elasticity, featuring a biomimetic energy‑storage structure that replicates human gait, while the helmet evenly disperses impact loads.

• Rail transit, high-end industrial tooling

Curved train car bodies, lightweight robotic arms, and wear‑resistant bearing bushings; corrosion‑resistant, low‑friction, and lightweight, they replace metal components to reduce the vehicle’s overall energy consumption. AFP One-piece, custom-shaped tooling that shortens the prototyping cycle.

IV. Summary of the Article

(1) Overview of Core Values

This article is CFRP A systematic, panoramic overview of the field, covering raw materials, manufacturing, and micro-level aspects. /  Covering the entire value chain—from macroscopic performance and multifunctionality to industrial implementation and circular recycling—this work standardizes quantitative metrics for various processes and material properties, thereby bridging information gaps across specialized research areas. The review not only draws on established theoretical foundations of basic materials but also provides quantified data for engineering material selection, addressing the needs of academic research topics, corporate process development, and the aerospace sector. /  The three categories of user needs in wind turbine structural design serve as a long‑term, industry‑standard reference work.

(II) The Three Major Core Bottlenecks Facing the Industry Today

• High cost threshold: PAN Precursor fiber carbonization is energy-intensive, and high-end lay-up equipment requires substantial capital investment, making it difficult to achieve large-scale commercial adoption as a mass‑market commodity.
• Environmental durability defects: under humid‑heat conditions, the matrix undergoes plasticization and interfacial hydrolysis, leading to a substantial reduction in interlaminar strength; outdoor… / The service life of marine components is limited;
• Thermoset composites are difficult to recycle, with existing recycling processes resulting in significant fiber‑strength degradation and an incomplete, mature closed‑loop value chain.

(III) Five Major Core Development Directions for the Future

• Low-cost green raw materials: lignin and recycled precursors for carbon fiber production; bio-based low-viscosity resins to reduce molding energy consumption.
• Multifunctional Smart Composite: Structural Performance Achieved Through Nanodoping - Sensing -  Self-healing integration, eliminating the need for additional sensing elements;
• Integration of Automation and Digital Twins: AFP Online Laser Monitoring + AI Defect prediction and closed-loop adaptive layup to reduce defect-related scrap.
• Scale-up of High-Performance Thermoplastic Systems: PEEK , The widespread adoption of remeltable dynamic resins enables component repair and large-scale recycling;
• Industrialization of Efficient Chemical Recycling: Supercritical Fluid Solvent Recovery Technology Has Been Implemented, Enabling the Closed-Loop Production of High-Strength Recycled Carbon Fibers.

(IV) Overall Industry Development Outlook

CFRP It will not completely replace metals or fiberglass, but it holds irreplaceable advantages in the fields of lightweight design, long‑term durability, and multifunctional high‑end equipment. In the short term, the industry’s core task is to optimize molding processes and reduce material production costs; in the medium to long term, leveraging three major technological breakthroughs—nanomodification, digital intelligent manufacturing, and closed-loop recycling—we will address the twin challenges of high cost and difficult recyclability, enabling carbon‑fiber composites to transition from niche aerospace applications to widespread adoption in new energy, rail transit, and civilian equipment, thereby fostering the synergistic development of lightweighting and green manufacturing.

Image and Text Guide

Figure 1. CFRP A schematic diagram and its operating principle. This diagram is based on [12] Drawing based on the information in.

Figure 2 . ( a1 ) CF-1 , ( b1 ) CF-2 , ( c1 ) CF-3 , ( d1 ) CF-4 , ( e1 ) CF-5 of the SEM Cross-sectional morphology image; and ( a2 ) CF-1 , ( b2 ) CF-2 , ( c2 ) CF-3 , ( d2 ) CF-4 , ( e2 ) CF-5 of the AFM Surface morphology image. Data cited from [17] 《 Materials 》journal, MDPI 。

Table 1. Representative properties of common thermoplastic polymers.

Figure 3. Carbon fiber-reinforced plastics prepared by different methods ( CFRP ) of tensile strength retention. The data are based on [16,39,40] Construction of the results reported in the study.

Figure 4. CFRP Scanning electron microscope images of the tensile fracture surface reveal that the fibers are partially embedded in the epoxy matrix and exhibit typical matrix cracks and fiber pull-out following tensile loading. - Characteristics of matrix–particle interactions. Quoted from [42] , Polymers 》Journal ( MDPI ).

Figure 5. Fault-plane comparison: (a) Contains 10% Rubber formulation; (b) Contains 30% The rubber formulation. Quoted from [44] , Polymers 》journal, MDPI 。

Table 2. Fiber orientation affects CFRP The Influence on the Mechanical Properties of Laminated Boards

Figure 6. Fiber Structure and Defects Affect CFRP The influence on mechanical behavior. This model is based on [56,57] Constructed from the data reported in the study.

Figure 7. CFRP The relationship between fiber orientation and shear stress. This figure is based on… [58] Plotted based on the data reported in the Chinese publication.

Figure 8. Relationship between porosity content and performance degradation. Based on [59] Construction of the data in the report.

Figure 9. Thermal conductivity at room temperature ( CFRP Compared with epoxy resin). The data are based on [62] Construction of the results reported in the study.

Table 3. CFRP Representative data on impact damage and residual strength of laminated composites.

Table 4. Structural stresses of fighter aircraft and naval aircraft, and CFRP Performance

Figure 10. Displayed CFRP The relationship between the tensile strength and elastic modulus of the composite material and its exposure time to the environment reflects its behavior under simulated aqueous conditions. (a) Water, (b) Hydrochloric acid and (c) Long-term durability in sodium hydroxide solutions. Data cited from [89] 《 Polymers 》Journal ( MDPI ).

Figure 11. Global, by market segment CFRP Demand ( 2010–2030 year). Data source: [89,93–95] The report in.

Table 5. Emerging Sustainability CFRP Quantitative comparison of technologies.

Figure 12. CFRP Schematic diagram illustrating the mechanisms of exogenous and endogenous self-healing polymers in applications: (a) Repair is achieved by releasing encapsulated substances following injury. (b) Repair is achieved through reversible chemical bonds within the polymer matrix. Quoted from [111] , Open Access.