What Is Carbon Fiber?

Carbon fiber is a high-performance structural composite material composed of carbon filaments combined with polymer resin systems to form load-bearing laminates and profiles.
In industrial and OEM applications, carbon fiber material is engineered to deliver predictable carbon fiber mechanical properties rather than decorative or cosmetic appearance.
 
From a material engineering perspective, carbon fiber is selected for its exceptional carbon fiber tensile strength, high carbon fiber stiffness, and superior strength-to-weight ratio compared with traditional metals.
The carbon fiber modulus can vary significantly depending on fiber grade and laminate architecture, allowing stiffness to be tailored to specific load paths and deflection requirements.
 
Another critical parameter is carbon fiber strain, typically expressed as strain-to-failure.
For standard carbon fiber composites, carbon fiber strain values generally range from approximately 1.3% to 2.1%, depending on fiber type, resin system, and laminate design.
These parameters directly influence fatigue behavior, damage tolerance, and long-term structural reliability.
 
It is important to note that carbon fiber is not an isotropic material.
Its mechanical properties, including tensile strength, modulus, and strain behavior, depend strongly on fiber orientation and layup design.
As a result, carbon fiber is widely used as a structural engineering material, specified through design and analysis rather than treated as a general-purpose substitute for metal.

Carbon Fiber Material Property Comparison

Engineering Comparison Based on Authoritative Sources

The performance of carbon fiber material is characterized by measurable mechanical properties such as tensile strength, modulus, strain, and fatigue behavior.
The values below represent typical engineering reference ranges for industrial and aerospace-grade carbon fiber composites.
Material Density (g/cm³) Tensile Strength (MPa) Specific Strength* Tensile Modulus (GPa) Data Source
Carbon Fiber Composite (Epoxy) 1.5–1.8 600–1500 400–1000 70–230 ASM / NASA
Aluminum 6061-T6 2.7 ~310 ~115 69 Aluminum Association
Structural Steel (A36) 7.85 400–550 ~55 200 World Steel
E-Glass Composite 1.9–2.1 500–900 ~260–430 20–30 Owens Corning
 

In practical design, carbon fiber strain is commonly interpreted as strain-to-failure, while carbon fiber modulus defines stiffness along the fiber direction.
Carbon fiber tensile strength indicates maximum load capacity before failure but must be evaluated together with fiber orientation and laminate design.

Fatigue & Durability Comparison

Material Únavové chování Odolnost proti korozi Reference
Carbon Fiber Composite Minimal strength loss after 10⁶ cycles Excellent ASTM D3479 / FAA
Aluminum Alloys Progressive fatigue cracking Good ASM
Structural Steel High fatigue sensitivity Poor–Fair World Steel
Fiberglass Composite Good fatigue resistance Excellent CompositesWorld

Actual performance varies depending on alloy grade, fiber architecture, resin system, and manufacturing process. The data above represents typical engineering reference ranges used for material comparison.

Carbon Fiber Product Forms

Carbon fiber material is supplied in multiple product forms to meet different structural, machining, and assembly requirements.

composite tube customization options

Kompozitní trubky

Carbon fiber tubes are hollow structural forms designed to deliver high bending stiffness and torsional strength at low weight.

carbon fiber sheet 3mm​

Plechy a desky

Carbon fiber sheets and plates are flat laminate materials supplied for machining, cutting, and secondary fabrication.

carbon fiber parts & profiles overview

Díly a profily

Carbon fiber can be engineered into custom structural parts and profiles through molding, layup, and machining processes.

hollow carbon fiber rods

Kompozitní tyče

Carbon fiber rods are solid composite profiles offering high axial stiffness and dimensional stability.

The selection of carbon fiber product form depends on load conditions, geometry, manufacturing method, and cost considerations.

Design Considerations & Limitations of Carbon Fiber

While carbon fiber offers exceptional performance advantages, its effective use requires proper engineering design and an understanding of its material limitations.

Anisotropy & Load Direction

Carbon fiber composites are anisotropic materials, meaning their mechanical properties vary with fiber orientation.
Maximum strength and stiffness are achieved along the fiber direction, making laminate design and load path definition critical in structural applications.

Failure Behavior & Impact Sensitivity

Unlike metals, carbon fiber does not plastically deform before failure.
Overloading or impact can lead to sudden fracture or internal delamination, which may not be visible on the surface but can significantly reduce structural integrity.

Manufacturing & Cost Considerations

Carbon fiber components require specialized manufacturing processes, tooling, and quality control.
Material cost, processing complexity, and production volume must be evaluated early to balance performance benefits with economic feasibility.

Environmental & Thermal Limits

The performance of carbon fiber composites is strongly influenced by the selected resin system.
Service temperature range, UV resistance, and moisture durability depend on resin chemistry and surface protection rather than the carbon fibers themselves.

Řešení z uhlíkových vláken pro různé Aplikace

sportovní vybavení

Sportovní vybavení

Uhlíkové hřídele šípů, kulečníková tága, hokejové hřídele, lakrosové hřídele a sportovní komponenty z CFRP.
OEM výrobky z uhlíkových vláken a kompozitů vyráběné pro tuhost, snížení hmotnosti a výkonnostní aplikace sportovního vybavení.

záchranné, bezpečnostní a dosahové nástroje

Venkovní nářadí

Čisticí tyče, inspekční tyče, polní nářadí a teleskopické kompozitní komponenty
Lehké a odolné výrobky z uhlíkových vláken optimalizované pro přenosnost, dosah a provozní spolehlivost venkovního nářadí.

trubky a ramena z uhlíkových vláken pro drony

Drony a bezpilotní letadla

Rámy, ramena, podvozky a lehké konstrukční součásti dronů
Vysokopevnostní struktury z uhlíkových vláken navržené pro optimální poměr pevnosti a hmotnosti v aplikacích bezpilotních letadel a dronů.

Uhlíková vlákna pro roboty a automatizaci

Robot & automatizace

Ramena robotů, výložníky, konstrukční články a zakázkové komponenty z CFRP
Přesné kompozitní díly navržené pro tuhost, rozměrovou stabilitu a dynamické vlastnosti v robotických systémech.

Uhlíková vlákna pro automobily a automobilový průmysl

Automobily a automobilový průmysl

Konstrukční výztuhy, interiérové obložení a zakázkové komponenty z CFRP
Řešení z uhlíkových vláken zaměřená na snížení hmotnosti, funkční integraci a odolnost pro aplikace v automobilovém průmyslu a mobilitě.

zakázkové robotické díly z uhlíkových vláken

Průmyslové a užitkové služby

Čisticí tyče, inspekční tyče, polní nářadí a teleskopické kompozitní komponenty
Lehké a odolné výrobky z uhlíkových vláken optimalizované pro přenosnost, dosah a provozní spolehlivost venkovního nářadí.

přilby z uhlíkových vláken

Ochrana a bezpečnost

Ochranné vložky, kormidla, výztužné panely a nárazuvzdorné kompozitní komponenty.
Díly z uhlíkových vláken a kompozitních materiálů navržené pro ochranu, strukturální integritu a kritické bezpečnostní aplikace.

Carbon Fiber vs Aluminum: Engineering Material Comparison

Carbon fiber composites and aluminum alloys are both widely used structural materials in industrial and OEM applications.

The comparison below is based on public engineering handbooks, aerospace material databases, and industry standards, commonly referenced during material selection.

1. Density & Weight Efficiency

Material Density (g/cm³) Reference
Carbon Fiber Composite (epoxy) 1.5 – 1.8 ASM International
Aluminum 6061-T6 2.70 The Aluminum Association

Engineering implication:
Carbon fiber composites are typically 30–45% lighter than aluminum for equivalent structural volume, making them preferable in weight-critical designs.

2. Strength-to-Weight Ratio (Specific Strength)

Material Tensile Strength (MPa) Density (g/cm³) Specific Strength*
Carbon Fiber Composite 600 – 1500 1.5 – 1.8 400 – 1000
Aluminum 6061-T6 ~310 2.70 ~115

*Specific Strength = Tensile Strength / Density (relative comparison)

Data sources:

  • ASM Handbook, Volume 21 – Composites

  • Aluminum Association – 6061-T6 Datasheet

Engineering implication:
Carbon fiber delivers 3–8× higher specific strength than aluminum, which is why it replaces aluminum in aerospace, UAV, and high-performance structures.

3. Stiffness (Modulus) Considerations

Material Tensile Modulus (GPa) Reference
Carbon Fiber Composite 70 – 230 (fiber-direction) NASA
Aluminum 6061-T6 ~69 Aluminum Association

Engineering implication:

  • Aluminum provides isotropic stiffness (same in all directions).

  • Carbon fiber stiffness is direction-dependent, allowing engineers to place stiffness only where needed—resulting in lighter structures.

4. Fatigue & Service Life

Performance Aspect Uhlíkové vlákno Aluminum Reference
Únavové chování Minimal degradation after 10⁶ cycles Progressive crack growth ASTM D3479 / ASM
Odolnost proti korozi Immune to corrosion Susceptible without protection NASA / ASM
Typical Service Life 15–25+ years Design-dependent FAA / ASM

Engineering implication:
Carbon fiber performs exceptionally well in cyclic loading environments, while aluminum requires careful fatigue and corrosion management.

5. Thermal & Environmental Performance

Parametr Carbon Fiber Composite Aluminum Reference
Coefficient of Thermal Expansion −0.1 to 1.0 µm/m·K ~23 µm/m·K NASA
Continuous Service Temperature Resin-dependent (120–250 °C) >200 °C ASM

Engineering implication:
Carbon fiber offers excellent dimensional stability under temperature change, while aluminum expands significantly with heat.

6. Manufacturing & Cost Considerations

Factor Uhlíkové vlákno Aluminum
Material Cost Higher Lower
Manufacturing Composite layup, molding, curing Machining, extrusion, forming
Flexibilita designu High (custom layups) Moderate
Best Use Case Weight-critical, high performance Cost-sensitive, high volume

Summary: When Carbon Fiber Replaces Aluminum

Carbon fiber is typically selected over aluminum when:

  • Weight reduction is critical

  • High specific strength or stiffness is required

  • Fatigue resistance and corrosion immunity are important

  • Custom structural optimization justifies higher material cost

Aluminum remains advantageous where:

  • Cost sensitivity dominates

  • Isotropic properties are preferred

  • High-volume, simple geometries are required

Data Sources & Standards

  1. ASM Handbook, Volume 21 – Composites

  2. NASA Materials and Processes Technical Information System (MAPTIS)

  3. ASTM D3039 / ASTM D3479

  4. The Aluminum Association – Aluminum 6061-T6 Datasheets

  5. FAA Advisory Circular AC 20-107B

Často kladené otázky

Yes, carbon fiber has a significantly higher strength-to-weight ratio than steel.
While steel may offer higher absolute strength in bulk form, carbon fiber provides comparable or higher tensile strength at a much lower weight, making it more efficient in weight-sensitive structural applications.

In terms of specific strength and stiffness, carbon fiber outperforms aluminum.
Carbon fiber composites can achieve several times the strength-to-weight ratio of aluminum alloys, which is why they are often selected in aerospace, UAV, and high-performance structural designs.

Carbon fiber does not plastically deform like metals and is considered a brittle material in failure behavior.
When overloaded, it may fail suddenly rather than bending, which is why proper laminate design, safety factors, and impact considerations are critical in engineering applications.

Carbon fiber strain typically refers to strain-to-failure, which indicates how much deformation the material can withstand before fracture.
For standard carbon fiber composites, strain-to-failure values generally range from approximately 1.3% to 2.1%, depending on fiber grade, resin system, and laminate architecture.

Carbon fiber composites offer excellent fatigue resistance and do not corrode like metals.
When properly designed and protected from excessive impact or environmental exposure, carbon fiber components can achieve service lives of 15–25 years or more in structural applications.

Carbon fibers themselves are thermally stable, but the resin system determines heat and moisture resistance.
Continuous service temperature and environmental durability depend on resin selection, surface protection, and operating conditions rather than the carbon fibers alone.

Carbon fiber may not be ideal for cost-sensitive, high-volume designs, applications requiring ductile deformation, or environments involving severe impact without inspection capability.
In such cases, metals or alternative composites may provide a more suitable balance of performance and cost.