<scp>Experimental</scp> investigation of impact resistance and compression behavior of <scp>CF</scp>/<scp>PEEK</scp> laminates after hot‐press fusion repair with different stacking sequences

The finite element model of a 7.62 mm armor‐piercing incendiary bomb penetrating lightweight composite target is established. The structure of the target plate is composed of boron carbide ceramic/carbon fiber laminate/aramid fiber laminate/damping material. The reasonable distribution position of damping material is explored by designing the material structure and geometric parameters. Genetic algorithm is used to optimize the structure of the lightweight composite target plate, and the feasibility of the optimization results is verified through experiments. The results show that under the same surface density, the energy absorption value of the target plate with a certain thickness of back layer damping is 1.36% higher than that of the target plate without damping. And the damping material on the back layer can act as a buffer layer to reduce blunt trauma caused by bullets to the human body. The surface density of the optimized lightweight composite target plate is reduced by 21.6% under the same protection capability. This work provides a theoretical foundation for the impact resistance design and optimization of lightweight composite target plates.Highlights Impact resistance performance of lightweight composite target plate is investigated. The impacting analytical model of the structure is established. The validity of the optimized impacting analytical model is verified by numerical simulation.

Section: Materials Modelingmentioning

confidence: 99%

Impact resistance performance and structural optimization of lightweight composite target plate

Zhou,

Zheng

2024

“…The flame retardant performance of PLA/fiber composites with the addition of various flame retardants was analyzed and compared. By comparing the flame retardant properties and analyzing the flame retardant mechanism, the most effective flame retardant system for PLA/fiber composites prepared by film‐stacking procedure 35 was obtained.…”

Section: Introductionmentioning

confidence: 99%

Comparison of different flame‐retardant agents for polylactic acid/fiber composites by a film‐stacking method: Flame‐retardant performance and mechanical properties

Zheng,

Chen,

Cai

et al. 2024

In this investigation, characterization and comparison of the flame retardant performance were conducted for polylactic acid (PLA)/fiber composites featuring the incorporation of different flame retardants (APP, PAPP, and DMH). Based on the results obtained from the Limiting Oxygen Index (LOI) test and cone calorimeter test, it is evident that the intumescent flame retardants (IFR) such as APP and PAPP exhibit better efficacy on improving flame retardancy than DMH. The LOI value of the APP/PLA/F and PAPP/PLA/F composite reaches 35.5% and 27.4%, higher than that of DMH/PLA/F (23.0%). The pk‐HRR of APP/PLA/F and PAPP/PLA/F decreases 27% and 39% compared with PLA/F while the char residue at 500°C was higher than that of DMH/PLA/F (0.3 wt%) with the value of 51.4 and 44.1 wt%. It should be mentioned that the impact strength and tensile strength of PLA/fiber composite incorporating APP surpasses that of PAPP/PLA/F, which is caused by good dispersibility of fabrics among the PLA matrix, coupled with the strengthened interfacial adhesion between the fibers and the polylactic acid matrix. In summary, APP/PLA/F shows the most overall performance.Highlights Properties of PLA/fiber composites with various fire retardants were compared. APP/PLA/F obtained the best overall property while DMH/PLA/F had the worst. APP endows composites with excellent flame retardancy and mechanical property. The LOI value of APP/PLA/F was 35.3%, highest among four composites. Adding APP to PLA/F led to an increase in tensile strength and impact strength.

“…CFRP is an adaptable material that has several applications in clinical, aerospace, military, building, and other fields 1–5 . The fascinating properties of CFRP, including its exceptional strength and high stiffness, low thermal expansion coefficient, and biological compatibility, account for its broad use 6–9 . For polymers, thermoplastic polymers possess better properties than thermoset polymers, and the most representative polymer is polyaryletherketone (PAEK).…”

Section: Introductionmentioning

confidence: 99%

Enhancing interfacial adhesion of carbon fiber/poly(phthalazinone ether ketone) composites by the hybrid sizing agent of hydroxyapatite‐reinforced PAEK‐COOH

Liu,

Mei,

Cheng

et al. 2023

Improving the interfacial adhesion of carbon fiber (CF)/polymer composite is an urgent demand to enhance its mechanical properties. A kind of poly(aryl ether ketone) with carboxyl groups (PAEK‐COOH) was newly synthesized. PAEK‐COOH is similar to the thermal properties of PPEK matrix. Hydroxyapatite (HAp) was easily dispersed in an NMP solution containing PAEK‐COOH. Different kinds of hybrid sizing agents were obtained for preparing the prepreg through the solution impregnation. The hot‐pressing method was employed to produce the laminated composites. Flexural strength, flexural modulus and interlamellar shear strength (ILSS) of 0HP@CF/PPEK composites were improved by 8.8%, 17.3%, and 14.7%, respectively, in comparison to desized CF/PPEK. The interface bonding between CF and PPEK was improved by the addition of PAEK‐COOH sizing agent. Meanwhile, compared with desized CF/PPEK laminates, flexural strength, flexural modulus and ILSS of 5HP@CF/PPEK composites were enhanced by 63.5%, 87.4%, and 40.9%, respectively. The crack propagation path became dispersed and the stress was effectively absorbed when the sizing agent containing nano‐hydroxyapatite particles. By characterizing and reconstructing the transverse and longitudinal fracture in composite materials, the failure process of the composites under the action of stress was explained, and the interface theories of CF reinforced polymer were further explored.Highlights A kind of polyaryl ether ketone containing carboxyl functional group (PAEK‐COOH)was newly synthesized. HAp was distributed in the polymer sizing agent to obtain a HAp/PAEK‐COOH hybrid sizing agent. The interfacial adhesion of CF/PPEK composite was greatly improved by the hybrid sizing agent.