Comparison of mechanical property and machinability for polyetheretherketone and glass fiber–reinforced polyetheretherketone

Abstract

To study and compare mechanical properties and machinability of the polyetheretherketone and the glass fiber-reinforced polyetheretherketone and analyze the relationship between the two properties, nano-indentation experiments and single-point diamond turning experiments were carried out in this article. Through nano-indentation experiments, several material characteristic parameters such as elastic modulus, hardness, and load-displacement data were obtained and load-displacement curve was drawn. It was found that the glass fiber-reinforced polyetheretherketone has higher elastic modulus and hardness but poor uniformity. By single-point diamond turning experiments, two circular planes whose materials are polyetheretherketone and glass fiber-reinforced polyetheretherketone, respectively, were machined. It was found that form accuracy (PV) and surface roughness (Ra) of the former were smaller than those of the later, and glass fiber-reinforced polyetheretherketone plane has poor machined quality. Mechanical property, including uniform structure, stiffness, and resistance to deformation, has higher influence on machining quality.

Structural and Thermo-mechanical Evaluation of Two Engineering Thermoplastic Polymers in Contact with Ethanol Fuel from Sugarcane

“…It can be observed that the elastic modulus of the PEEK before and after 1 and 3 months ageing in anhydrous and hydrated ethanol again shows a value of approximately 3.7 GPa. The E it values of unaged/aged material are in good agreement with the literature 37,45,46 . The comparisons of the elastic modulus of unaged and aged PEEK were performed by Student's t-tests, and no significant differences were observed between the mean pairs compared.…”

“…In this case, the Student's t-tests did not indicate significant variations. In few cases, the small differences observed were attributed to the plasticizing effect that ethanol might have caused on the PEEK surface layers, but without 45 and Ji et al 46 . On the other hand, the µ-HB value of the unaged PA-11 was 32.9 MPa, which was reduced to approximately 29.8 MPa (reduction of 9.4%) and 28.8 MPa (reduction of 12.5%) for the materials aged for 1 month in anhydrous and hydrated ethanol at 60 °C, respectively.…”

Multi-objective optimization of machining parameters during milling of carbon-fiber-reinforced polyetheretherketone composites using grey relational analysis

“…Table 3 shows the S-N ratio values and their normalized values. The S-N ratio values were computed from equation (1) for Ra and equation (2) for MRR. The processing sequence was calculated by using equation (4) as the surface roughness fits ''the-smaller-the-better'' methodology, whereas for the material removal rate, the values were calculated by using equation 3because the MRR fits ''the-larger-the-better.…”

“…Polyetheretherketone (PEEK) is a crystalline high-performance special engineering plastic with excellent physical, mechanical, chemical, electrical and thermal properties such as its high heat resistance, fire resistance, and fatigue resistance. 1 To enhance the PEEK strength and performance, it is often necessary to add carbon fiber to the PEEK matrix. 2 Because carbon fiber and PEEK have a good compatibility, they can enhance the strength, friction performance and thermal properties of composites.…”

Effect of Fiber Type and Content on Mechanical Property and Lapping Machinability of Fiber-Reinforced Polyetheretherketone

“…The surface quality of pure PEEK was better than GF/PEEK with the same turning parameters. Ji et al [ 16 , 17 ] worked on the nanomechanical properties and machinability with the single-point diamond turning of PEEK, CF/PEEK, and GF/PEEK materials. The results demonstrated that PEEK was a single-phase material with constant values of nano-hardness and modulus, whereas CF/PEEK and GF/PEEK were fiber composite materials with superior hardness and elastic modulus.…”