Experimental study of the pre-gelation behaviour of composite prepreg

Duffner, Caitlin

doi:10.14288/1.0387323

Cited by 1 publication

(4 citation statements)

References 51 publications

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“…This would imply that within the ply, some regions see a larger consolidation than others. This is consistent with other studies that have shown the variability in a ply of AS4/8552 [5,24].…”

Section: Local Strain Variation Pre-gelationsupporting

confidence: 94%

“…Figure 3 shows the results for one DIC test performed on a 4 ply UD sample processed with the temperature cycle described in Figure 2. The results seen in the test presented here are consistent with, and representative of nine other tests with one hold temperature cycles and four tests with two hold cycles [5]. is the cooldown ramp.…”

Section: Global Transverse Strain Behavioursupporting

confidence: 85%

“…pre-gelation prepreg behaviour [5]. Throughout this study, the importance of the variability in the material and strain response during the early stages of processing is highlighted.…”

Section: Gelation Pointmentioning

confidence: 99%

“…Previous work has highlighted that the prepreg is not fully saturated, and there is a variable resin distribution within the fibre bed of AS4/8552 UD prepreg. This leads to self-consolidation within the ply when heated [5,21,22]. The driving force leading to this ply saturation is the surface tension driven capillary action which occurs between the resin and the fibre bed within the core of a ply.…”

Section: Observed Behaviour In Different Zonesmentioning

confidence: 99%

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The Effect of Material Variability on the Pre-Gelation Behaviour of Prepreg Composites

Poursartip¹,

Zobeiry²,

Duffner³

2020

SAMPE 2020 | Virtual Series

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Processes such as forming and AFP have become increasingly popular, and these manufacturing techniques require manipulation of the uncured pre-impregnated thermoset matrix composite material (prepreg). Interest in the initial state or pre-gelation behaviour of prepregs has grown due to these manufacturing trends as well as the increasing recent research connecting this regime to processing defects such as wrinkling and porosity. Historically, the pre-gelation behaviour of prepreg has been relatively unexplored due to the challenges that traditional testing methods have in handling the soft raw prepreg. It is shown here that Digital Image Correlation (DIC) can capture the prepreg behaviour through the entirety of a cure cycle on both a local and global level. This work presents the global response of the prepreg, showing the true pre-gelation response, which differs markedly from what has traditionally been presented as the expected behaviour.Additionally, the variability in local prepreg response can be linked back to local strain variations observed using DIC. With the insight into the variability of a ply and the pre-gelation strain response, the findings in this work emphasize the importance of understanding and accurately capturing the initial prepreg condition.

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Section: Local Strain Variation Pre-gelationsupporting

confidence: 94%

Section: Global Transverse Strain Behavioursupporting

confidence: 85%

“…pre-gelation prepreg behaviour [5]. Throughout this study, the importance of the variability in the material and strain response during the early stages of processing is highlighted.…”

Section: Gelation Pointmentioning

confidence: 99%

Section: Observed Behaviour In Different Zonesmentioning

confidence: 99%

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