Permeability measurement and flow simulation through fiber reinforcement

Gauvin, R.; Trochu, F.; Lemenn, Y.; Diallo, Laouratou

doi:10.1002/pc.10588

Cited by 117 publications

(61 citation statements)

References 16 publications

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“…The slight increase in strength at the highest flow rate may be due to statistical variation in the data resulting mainly from inhomogeneities in local mat architecture. Gauvin et al report that surface densities of many commercially available random mats can vary locally by a factor of as much as 100% [29]. This difference leads to variation in volume fraction and permeability throughout the part.…”

Section: Effect Of Injection Rate On Mechanical Propertiesmentioning

confidence: 99%

Effect of Injection Rate and Post-Fill Cure Pressure on Properties of Resin Transfer Molded Disks

Olivero

Barraza²,

O’Rear

et al. 2002

Journal of Composite Materials

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The effects of flow rate and post-fill cure pressure, i.e., packing pressure, on the mechanical properties of resin transfer molded disks are experimentally investigated. An experimental molding setup is constructed to fabricate fiber-reinforced, center-gated, disk-shaped composite parts. Disks are molded at different flow rates and packing pressures in order to observe the effects of these parameters on the mechanical properties and void content of the final parts. Specimens are cut from three different locations in the molded disks for testing. Specimens from the first two locations are tensile tested to obtain strength and stiffness properties, and the third location is used for microscopic analysis to determine void content and void properties. Increased injection rate is found to reduce both the strength and stiffness of the molded parts due to more voids induced by the faster moving fluid front. Packing pressure is also found to have a significant effect on specimen properties. At higher packing pressures fewer voids and improved strength and stiffness are observed. Mechanical properties are correlated with total void fraction for disks molded at different packing pressures. Exponential decrease in both tensile strength and elastic modulus is observed with increasing void fraction. Doubling the void volume fraction from 0.35 to 0.72% results in a 15% decrease in strength and a 14% decrease in stiffness. The results demonstrate that selection of suitable injection rate and addition of packing pressure to resin transfer molding (RTM) process can improve mechanical properties of molded parts considerably.

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Section: Effect Of Injection Rate On Mechanical Propertiesmentioning

confidence: 99%

Effect of Injection Rate and Post-Fill Cure Pressure on Properties of Resin Transfer Molded Disks

Olivero

Barraza²,

O’Rear

et al. 2002

Journal of Composite Materials

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show abstract

“…But these information are of no concern for the composite manufacturers who need sound data on the compressed fibrous medium during resin infiltration. A few works were reported on the rearrangement of fibrous canvas in the stacking, the compression and the resin infiltration stages, but the results are contradictory (Gauvin et al, 1994;Chen et al, 2001;Cadinot, 2002) and hardly applicable to materials processing. Moreover, these investigations focus on the reinforcement although the resin infiltration relates to the space between the fibers.…”

Section: Introductionmentioning

confidence: 99%

Serial Sections Through a Continuous Fiber-Reinforced Polymer Composite

et al. 2011

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The microstructure of a unidirectional glass-fiber composite material is described seeking especially for the influence of the stitching perpendicular to the reinforcement. Serial cuts are performed through the composite and the microstructure is quantified using global parameters and linear morphological analysis. A key result is that the stitching induces variations in fibers spacing within the yarns and in the matrix volume between the yarns. This can affect noticeably the flow of the resin during the manufacturing process and also the mechanical properties of the composite.

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“…A transparent mold was used to enable the monitoring of the advancing front. Other techniques based also on the observation of the moving resin front are common in the literature [43,[51][52][53][54][55][56][57][58][59]. However, transparent mold walls may not have enough rigidity to avoid deflection, which has been shown to perturbate the measured permeability values [45,48,49,54].…”

Section: Analytical Validationmentioning

confidence: 99%