The mechanical properties of PEEK (polyetheretherketone) material are its core advantage as a high-performance engineering plastic. The following is a comprehensive parameter and characteristic analysis:
1、 Basic mechanical performance
Tensile strength
The tensile strength of pure PEEK can reach 90-148 MPa, and after carbon fiber reinforcement (CF/PEEK), it can be increased to 150-170 MPa, which is close to the level of aluminum alloy (200-300 MPa).
The elongation at break is about 5% -17%, which combines rigidity and toughness.
Bending performance
The bending strength is 130-150 MPa (pure PEEK), and the reinforced type can reach 200-250 MPa.
The bending modulus is 3.6-4.1 GPa (pure PEEK), and it reaches 130 GPa after carbon fiber reinforcement.
Impact resistance
The impact strength without notches is 80-100 kJ/m ² (pure PEEK), and the impact strength with notches is 6-20 kJ/m ², which is superior to most engineering plastics.
2、 Dynamic mechanical properties
Fatigue resistance
The fatigue resistance under alternating stress is comparable to that of metal alloys, and is suitable for dynamic load scenarios such as robot joints and bearings.
Creep resistance
The creep rate is low at high temperatures, and the tensile strength remains above 50 MPa at 200 ℃ (the reinforced type can reach up to 70 MPa).
3、 Friction and wear performance
Self lubrication: The coefficient of dynamic friction is 0.17-0.34, with a limit PV value of 4 MPa · m/s, suitable for oil-free lubrication components.
Wear resistance: It maintains a low wear rate at a high temperature of 250 ℃, with a wear scar width of only 3-4 mm.
4、 Comparative advantage
Lightweight: with a density of 1.26-1.32 g/cm ³, the specific strength (strength/density) is significantly higher than that of metals.
Temperature adaptability: The performance is stable within the range of -50 ℃ to 250 ℃, and the high-temperature strength attenuation rate is low.
5、 Application scenarios
High load structural components: such as aerospace fasteners and automotive transmission parts.
Precision wear-resistant components: such as medical device implants and robot gears.
Note: Specific performance may be adjusted due to modifications (such as carbon fiber, glass fiber reinforcement) or differences in processing technology.
