Study of the influence of <scp>PPS</scp>, <scp>PAEK</scp>, and <scp>PEEK</scp> thermoplastic matrices on the static mechanical behavior of carbon fiber‐reinforced composites

This study investigates the tribological and mechanical properties of poly‐ether‐ether‐ketone (PEEK) and polytetrafluoroethylene (PTFE) based composites with molybdenum di‐sulphide (MoS2) reinforcements. Polymeric composite materials have gained popularity in various tribology applications due to low weight, reduced wear and friction characteristics, and improved commercial aspects. MoS2 exhibits superior strengthening characteristics and improved tribological functionality depending on its concentration. Mechanical properties were assessed using micro‐scratch testing, whereas tribological characteristics were investigated using pin‐on‐disc arrangement in dry conditions. Counter face discs were made up of 316 L Steel with four different roughness characteristics obtained from common machining operations: polished, turned, milled, and grit‐blasted. Friction and wear results were analyzed under three loading conditions and four roughness characteristics. MoS2‐reinforced composites exhibited a scratch hardness that is roughly double that of PEEK and around ten times higher than that of PTFE. Simultaneously, adding 3 wt.% of MoS2 in PEEK and PTFE composite reduces both volumetric wear and friction significantly compared to other combinations of materials. This study can, therefore, be practically important to produce direction in order to make a composite such as PEEK‐PTFE‐MoS2 (1–3 wt%) to achieve tailored tribological performances based on system operational features such as load, speed, temperature, and roughness characteristics.Highlights PEEK and PTFE based composites reinforced with molybdenum disulphide (MoS2). Pin‐on‐disc and scratch tests are considered for experimental analysis. 3 wt.% of MoS2 base‐composite turned out to be the best performer. Investigation progresses with a variation of sliding speed and surface roughness.

Section: Introductionmentioning

confidence: 99%

A study on tribological performances of PEEK and PTFE based composites with MoS₂ reinforcements

Guru,

Panda,

Kumar

et al. 2024

Fatigue resistance of carbon fiber/polyphenylene sulfide composites engineered for automotive use

Morgado,

Montagna,

Gouvêa

et al. 2024

Self Cite

This study comprehensively investigates a carbon fiber‐reinforced polyphenylene sulfide (CF/PPS) composite through tensile, fatigue, interlaminar shear strength (ILSS), dynamic mechanical tests (DMA), and also fractographic analysis. Prepared via hot compression molding, the CF/PPS composites exhibit a consistent quality. Tensile tests show an elastic modulus of 37.2 ± 0.2 GPa and an average tensile strength of 800 ± 73 MPa. Fatigue tests demonstrate infinite life at 1 million cycles, achieved at 80% of the maximum stress level. Fractographic analyses unveil directly attributable fiber failures (DAFFs), affirming a robust fiber/matrix interface. DMA shows a glass transition temperature of 86°C, showcasing the composite's structural integrity across varied temperatures. With an ILSS of 68.8 ± 3.5 MPa, the composite displays excellent fiber‐matrix adhesion. The results highlight the suitability of the CF/PPS composite for high‐strength and lightweight applications in the automotive sector, offering valuable insights for material selection, design, and production processes. Thus, contributing to the production of durable and efficient automotive components among the challenges of modern and safe transportation.Highlights Comprehensive study on CF/PPS composites. Varied mechanical assessments: tensile, fatigue, ILSS, DMA. Uniform preparation via hot compression molding. Detailed fractography reveals a strong fiber/matrix interface. Suitability for high‐strength and lightweight automotive applications.

Effect of polymer crosslinking to the failure behavior of thermoplastic composite remelting interface: Molecular dynamics simulation and experimental verification

Dai,

Zhan,

Zhu

et al. 2024

The forming interface is the weak link of thermoplastic composite complex structures. To explore the effect of polymer crosslinking on the failure behavior of thermoplastic composite remelting interface using “Preforming + Remelting bonding” process, the all‐atom models of different types of interfaces were established, and a molecular dynamics (MD) simulation was conducted on the uniaxial tensile failure process of the remelting interface. The failure behavior of the remelting interface with different preforming processes was tested to verify the correctness of MD simulation, and the influencing mechanism of polymer crosslinking reactions in the preforming stage to the remelting interface properties was clarified. The results showed that the yield stress of the uncrosslinked interface reaches 283.2 MPa and 16.0% and 50.6% higher than that of the unilateral and bilateral crosslinked interfaces respectively. The polymer crosslinking reaction during the preforming stage will reduce the interlaminar bonding performance. The interlaminar shear strength (ILSS) of the uncrosslinked interface is 87.46 MPa and 7.21% and 27.36% higher than that of the unilateral and bilateral crosslinked interface respectively, and only 3.95% lower than that of the non‐remelting sample formed by standard process. This research provides a new approach for predicting and analyzing the effect of polymer crosslinking on remelting interface properties of thermoplastic composite using “Preforming + Remelting bonding” process.Highlights The failure behavior of different thermoplastic composite remelting interfaces was studied. MD simulation was conducted on the uniaxial tensile failure process of the remelting interface. The influencing mechanism of polymer crosslinking reactions in the preforming stage to the remelting interface properties was clarified. It is effective to explore the failure mechanism of thermoplastic remelting interface by MD simulation.