Effect of hygrothermal condition on single-lab shear behavior of induction-welded CF/PEKK thermoplastic composites

“…The causes of the weak bond include the influence of the bonding process such as contamination of the adherend surface and the adhesive and improper surface treatment of the adherend. In addition, the influence of the surrounding environment, such as the deterioration of the adhesive and the interface at severe environmental conditions (Hoang et al, 2022), hygrothermal conditions (Jeong et al, 2022), and cryogenic conditions (Kumazawa et al, 2022), and the corrosion of the adherend due to water absorption (Morimoto et al, 2021). In the metal-CFRP adhesive joint that exists with the multi-materialization of aircraft structures, since the galvanic potential of CFRP is much nobler than that of metal, the occurrence and progress of galvanic corrosion of metal adherends are inferred especially in a wet atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Effect of corrosion on mechanical properties for CFRP/aluminum adhesive joints under a salt spray environment

Kobayashi

Yanagisawa

Osada

et al. 2023

Mechanical Engineering Journal

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In this study, we aim to investigate the effect of galvanic corrosion on the mechanical properties of aluminum-CFRP adhesive joints. Aluminum-CFRP, aluminum-aluminum, and CFRP-CFRP adhesive joint specimens were prepared. Subsequently, the specimens were subjected to accelerated aging treatment in a salt spray environment, and the tensile shear adhesive strength, the transition of the failure surface and the deposition state and the components of corrosion products with aging time were quantitatively evaluated. As a result, in aluminum-CFRP adhesive joints under the salt spray, galvanic corrosion of the aluminum substrate occurred within 24 hours, and the adhesive-adherend interfacial strength decreased significantly compared to aluminum-aluminum and CFRP-CFRP adhesive joints. In addition, the failure mode of aluminum-CFRP adhesive joints changed from the mixed failure of interfacial failure, cohesive failure, and fiber tear failure to interfacial failure. Furthermore, it was found that the deposition amount of Al 2 O 3 increased under the influence of the salt spray environment.

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4D printing of heat‐stimulated shape memory polymer composite for high‐temperature smart structures/actuators applications

Kumar,

Ojha,

Ramesh

et al. 2024

Polymer Composites

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High temperature shape memory polymers (HT‐SMPs) have great utilization in self‐deployable hinges/morphing structures for space/aerospace, and high‐temperature sensors/actuators for electronics. However, HT‐SMPs have many drawbacks, such as low stiffness, strength, thermal stability, and dynamic mechanical properties. This work aims at improving these properties of highly utilized space grade HT‐SMP, PEKK (polyether ketone ketone), by reinforcing it with low‐cost carbon fibers (CFs), and developing its composite via additive manufacturing. The additively manufactured CF/PEKK composites are annealed at 200 °C (CF/PEKK‐A200) and 250 °C (CF/PEKK‐A250), and for the first time, investigated for shape memory effect (SME). The shape fixity and the shape recovery of the CF/PEKK‐UNA (un‐annealed), CF/PEKK‐A200, and CF/PEKK‐A250 are noted to be 95.97%, 88.95%, and 86.40%, and 88.70%, 92.70%, and 95.19%, respectively with a significant weight saving potential of ⁓21%. Dispersion of CFs in PEKK and suitability of processing parameters (blending, extrusion, and 3D printing) are confirmed through scanning electron microscopy (SEM). Thermal degradation temperature () of the printed CF/PEKK composite (⁓568 °C) is found to be ⁓3.5% higher than PEKK (⁓549 °C). CF/PEKK‐A250 exhibited the highest storage modulus (4438.23 MPa), ~158% higher than PEKK (1722.3 MPa), while CF/PEKK‐A200 demonstrated the highest tensile modulus (10.9 GPa), which is 138.5% higher than PEKK (4.57 GPa) and 312.88% higher than CF/PEKK‐UNA (2.64 GPa). Moreover, CF/PEKK‐A200 exhibited 237.46%, 138.51%, 127.08%, 61.48%, 32.93%, and 50.35% higher tensile modulus than PEEK, PEKK, PEK, CF/PEK, CF/PEEK, and CF/PEKK composites, respectively, showing great potential to replace them.Highlights Printed CF/PEKK composites are investigated for shape memory behavior. The printed composites exhibited outstanding shape memory properties. Printed‐A200 exhibited 138.51% enhanced tensile modulus than pure PEKK. Also, the printed‐A200 showed 313% enhanced modulus than printed‐UNA. (568 °C) of the printed composites is found ⁓4% greater than pure PEKK.

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Effect of hygrothermal condition on single-lab shear behavior of induction-welded CF/PEKK thermoplastic composites

Cited by 8 publications

References 35 publications

Online characterization of moisture transport in a high-performance carbon fiber-reinforced thermoplastic composite at high temperatures: Identification of diffusion kinetics

Online characterization of moisture transport in a high-performance carbon fiber-reinforced thermoplastic composite at high temperatures: Identification of diffusion kinetics

Effect of corrosion on mechanical properties for CFRP/aluminum adhesive joints under a salt spray environment

4D printing of heat‐stimulated shape memory polymer composite for high‐temperature smart structures/actuators applications

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