Abstract:Please refer to published version for the most recent bibliographic citation information. If a published version is known of, the repository item page linked to above, will contain details on accessing it.
“…Figure 6 shows images of the prepreg materials. Further details on the material specifications can also be found in [12]. Trackmate [13].…”
Section: Review Of Shear Angle Measurement Methodsmentioning
confidence: 99%
“…Further details on the material specifications can also be found. 12 Figure 6.Materials tested: (a) 12 k 2 × 2 Twill thermoset prepreg and (b) 15 k unidirectional thermoset prepreg.…”
Please refer to published version for the most recent bibliographic citation information. If a published version is known of, the repository item page linked to above, will contain details on accessing it.
“…Figure 6 shows images of the prepreg materials. Further details on the material specifications can also be found in [12]. Trackmate [13].…”
Section: Review Of Shear Angle Measurement Methodsmentioning
confidence: 99%
“…Further details on the material specifications can also be found. 12 Figure 6.Materials tested: (a) 12 k 2 × 2 Twill thermoset prepreg and (b) 15 k unidirectional thermoset prepreg.…”
Please refer to published version for the most recent bibliographic citation information. If a published version is known of, the repository item page linked to above, will contain details on accessing it.
“…Currently, the Stribeck curve serves as a primary method for investigating the inter-ply slip behavior of prepregs [7][8][9][10], which defines the lubrication behavior by the ratio of the film thickness to the surface roughness. Many researchers hold that the inter-ply slipping behavior of prepregs conforms to the hydrodynamic lubrication behavior in the Stribeck curve [10][11][12]. Within hydrodynamic lubrication, the friction coefficient of the prepregs is linearly correlated with the Hersey number, which is determined by the viscosity, velocity, and pressure.…”
In this paper, the lubrication behavior of resin during the molding process of unidirectional prepreg materials was scrutinized using a custom-made device. The thickness of the resin between prepregs under various conditions was calculated using Inverse Hydrodynamic Lubrication (IHL) theory to elucidate the lubrication mechanism. This calculation was confirmed by examining the surface morphologies of the prepreg and employing Digital Image Correlation (DIC) techniques for validation. Furthermore, the effect of unidirectional fiber orientation on the process of inter-ply sliding was quantitatively analyzed through the combined roughness. The study showed that factors such as sliding velocity, normal pressure, and fiber orientation play a key role in the lubrication mechanism. The lubrication behavior of unidirectional prepreg transformed to mixed lubrication under specific conditions. The results in our study of the lubrication mechanism have significant implications for the refinement of molding process and the enhancement of numerical simulations of unidirectional prepregs.
“…In a common test method, a weighted sled is pulled over a test bed to determine the friction between ply/ply or tool/ply [20]. Another commonly applied test setup uses a plate with fabric attached to it, that is pulled out of or through two pressure plates where the other friction partner is attached to [21]. Rigidity of the tool is important, as misalignment of the tool due to the friction force can lead to uneven pressure distribution and therefore wrong measurements [19].…”
During deep drawing processes of fiber metal laminates, such as the newly developed in-situ hybridization process, fibers and metal sheets come into contact while the dry fabric is infiltrated by a reactive matrix system. The viscosity of the matrix increases as polymerization starts during deep-drawing. In the in-situ hybridization process, a dry fiber metal laminate is deep drawn while a thermoplastic matrix system is injected into the glass fiber fabric layer in a resin transfer molding process. During forming of the fiber metal laminate, friction occurs in tangential direction to the metal sheet. The friction plays the main role in preventing the elongation of the sheets in the deep drawing process. Therefore, the measurement of friction coefficients between fibers and metal sheets is essential. In this paper, the friction between sheet metal and dry or infiltrated glass fiber fabric under high contact pressures of 1.67 MPa, as occurring in deep drawing processes, is characterized. A modified strip drawing test setup is used to analyze the coefficient of friction under a constant high contact pressure. Compression tests were performed to show that Coulomb friction can be assumed. Different types of glass fiber fabrics and liquids with defined viscosities are used. It was found that fluids with higher viscosity decrease the friction coefficients in the interface, which is physically explained. For the in-situ hybridization process, it is deduced that with low viscosities, a better infiltration is achieved, while higher viscosities reduce the friction coefficient for better formability.
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