Effects of the Pre-Consolidated Materials Manufacturing Method on the Mechanical Properties of Pultruded Thermoplastic Composites

Vedernikov, Alexander; Minchenkov, Kirill; Гусев, С. А.; Сулимов, А. В.; Zhou, Ping; Li, Chenggao; Xian, Guijun; Akhatov, Iskander; Safonov, Alexander

doi:10.3390/polym14112246

Cited by 32 publications

(20 citation statements)

References 44 publications

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“…In fact, the ever-growing popularity of thermoplastic composites in the aerospace industry is primarily driven by the complexity of joining conventional thermosetting parts, the inability of thermosetting composites to be formed or melted, and their lack of recyclability [ 1 , 8 , 14 ]. Thermoplastic composites stand out due to their impressive properties compared to their thermosetting counterparts, such as the high impact toughness, faster processability, higher service temperatures, less environmental impact, recyclability, and unlimited shelf life of their source materials [ 15 , 16 ]. Additionally, it is critically important to develop systematic repair methodologies for composite parts when they are damaged.…”

Section: Introductionmentioning

confidence: 99%

Repair of Aerospace Composite Structures Using Liquid Thermoplastic Resin

2023

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In this study, two types of carbon-fiber-reinforced plastic (CFRP) composite scarf geometries were created using two scarf angles, i.e., 1.43° and 5.71°. The scarf joints were adhesively bonded using a novel liquid thermoplastic resin at two different temperatures. The performance of the repaired laminates was compared with pristine samples in terms of residual flexural strength using four-point bending tests. The repair quality of the laminates was examined by optical micrographs, and the failure modes after flexural tests were analyzed using a scanning electron microscope. The thermal stability of the resin was evaluated by thermogravimetric analysis (TGA), whereas the stiffness of the pristine samples was determined using dynamic mechanical analysis (DMA). The results showed that the laminates were not fully repaired under ambient conditions, and the highest recovery strength at room temperature was only 57% of the total strength exhibited by pristine laminates. Increasing the bonding temperature to an optimal repair temperature of 210 °C resulted in a significant improvement in the recovery strength. The best results were achieved for laminates with a higher scarf angle (5.71°). The highest residual flexural strength was recorded as 97% that of the pristine sample repaired at 210 °C with a scarf angle of 5.71°. The SEM micrographs showed that all the repaired samples exhibited delamination as the dominant failure mode, whereas the pristine samples exhibited dominant fiber fracture and fiber pullout failure modes. The residual strength recovered using liquid thermoplastic resin was found to be much higher than that reported for conventional epoxy adhesives.

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Section: Introductionmentioning

confidence: 99%

Repair of Aerospace Composite Structures Using Liquid Thermoplastic Resin

2023

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“…Unlike conventional injection molding (CIM) processes, the μIM processes are employed in small size and high precision situations [ 7 , 10 ]. Additionally, the improper manufacturing process and processd parameters will affect product quality [ 11 ]. The polymer flows with high speed and pressure in the cavities to guarantee the quality of the products, otherwise, there will be varieties of defects [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of Cavity Thickness and Mold Surface Roughness on the Polymer Flow during Micro Injection Molding

Liu

et al. 2023

Polymers

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In micro injection molding, the cavity thickness and surface roughness are the main effects factors of polymer flow in the die designing and affect the quality of molded products significantly. In this study, the effects of cavity thickness and roughness of cavity surface were investigated mainly on polymer flow during molding and on the roughness of molded products. The parts were molded in the cavities with the thickness from 0.05 mm to 0.25 mm and surface roughness from Ra = 46.55 nm to Ra = 462.57 nm, respectively. The filling integrities and roughness replication ratio of molded parts were used to evaluate the statements of polymer flow and microstructure replication during micro injection molding, respectively. The results showed that the filling integrity changing trends in the thinner cavities were obviously different or even opposite to those in the thicker cavities with the changing of cavity surface roughness instead of single trend in the conventional studies. For each cavity surface roughness, the filling integrity showed an upward trend with the increasing cavity thickness. In different cavity thickness, the maximum gap of filling integrity was 23.76 mm, reaching 544.94% from 0.05 mm to 0.25 mm. Additionally, the surface roughness ratio was slightly smaller than one before, reaching the polymer surface roughness limit around Ra = 71.27 nm, which was decided by the nature of the polymer itself. This study proposed the references for the design and fabrication of mold cavities and parts, and saved time and cost in the actual product manufacturing.

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“…With the increasing of height for buildings, the traditional steel structure is prone to buckling instability, and will produce large vibration under the actions of earthquake and strong wind, which can affect comfort and not meet the needs of engineering projects. At present, the combination with new materials and new structural forms, such as the organization between FRP, concrete with high ductility and steel tube with high strength, multi-web structure, can make the members greatly play the advantages of materials, which can be widely used in the architectures (Ekmektapar and Al-Eliwi, 2017;Afshar et al, 2020;Alajarmeh et al, 2021;Cai et al, 2021;Lepcha and Patton, 2021;Vedernikov et al, 2022). With the continuous development of science and technology, wide flange steel has emerged.…”

Section: Introductionmentioning

confidence: 99%

Flexural behavior of composite beams with concrete filled steel tube flanges and honeycombed steel webs

Li²,

Jiang³

et al. 2022

Front. Mater.

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Honeycombed beams are widely used because they are conducive to the layout of pipelines and circuits, and the traditional honeycombed beams are generally H-shaped steel beams and concrete-encased upper flange composite beams. In this paper, a composite beam with concrete-filled steel tube as both upper and lower flanges and steel plate with circular openings as web is proposed. The effective constraint of steel tube on concrete strengthens the deformation ability of concrete. In order to study the flexural behavior of composite beams with concrete filled steel tube flanges and honeycombed steel webs (SHC), 25 simply-supported SHC beams were designed to carry out the four-point bending load simulation analysis. By reasonable modeling method. The main parameters of SHC concluding the compression strength of concrete (fck), yield strength of steel (fyfk), height-to-span ratio (H/L), ratio of space to height of web (s/hw), thickness of steel tube flange (t1), thickness of web (t2) and ratio of hole to height of web (a/hw) were discussed, and the whole loading process of the beam was analyzed. The results showed that the SHC specimens could be divided into elastic stage, elastic-plastic stage and plastic stage under four-point bending load. Steel tube in the tensile zone yielded firstly before specimens failed, and the failure mode of the specimens was that the concrete at the loading point was crushed. Though the steel tube in lower flange at the support, loading point and mid-span yielded, the web did not buckle. SHC could meet the requirements of Chinese code in the normal use stage, and the cross-section deformation basically conformed to the plane assumption. Finally, based on the unified strength theory, a prediction formula of ultimate bending moment is established, which is in good agreement with experiment and can lay the foundation for the popularization and application of this kind of beams.

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Effects of the Pre-Consolidated Materials Manufacturing Method on the Mechanical Properties of Pultruded Thermoplastic Composites

Cited by 32 publications

References 44 publications

Repair of Aerospace Composite Structures Using Liquid Thermoplastic Resin

Repair of Aerospace Composite Structures Using Liquid Thermoplastic Resin

Effects of Cavity Thickness and Mold Surface Roughness on the Polymer Flow during Micro Injection Molding

Flexural behavior of composite beams with concrete filled steel tube flanges and honeycombed steel webs

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