Understanding tack behaviour during prepreg-based composites’ processing

Wang, Yi; Mahapatra, Sarthak; Belnoue, Jonathan P.-H.; Ivanov, Dmitry; Hallett, Stephen R

doi:10.1016/j.compositesa.2022.107284

Cited by 11 publications

(4 citation statements)

References 30 publications

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“…The viscosity of the resin in thermoset prepreg not only determines the processing window for layup process but also significantly influences the distribution of resin on the fiber surface, which affect the contact performance of the prepreg. [39][40][41] In this section, the viscosity variation of the resin in the EV201 prepreg during the curing process within a specific temperature range was investigated using a rotational rheometer, refer to the standard ASTM D2196, 38 as depicted in Figure S3. The testing resin was scraped from the prepreg, uniformly applied onto parallel plate fixtures, with the inter-plate pressure of 1.0 N. The temperature ranged from 15 C to 130 C, with a heating rate of 3 C/min.…”

Section: Viscosity Testing Of Resin In Prepregmentioning

confidence: 99%

Effect of temperature aging of thermoset UD prepregs on inter‐ply friction behavior and formability in prepreg compression molding process

Zhang,

Han,

Liu

et al. 2024

Polymer Composites

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Limited material out‐life of thermoset prepregs is unavoidable attributed to the slow crosslinking reaction between molecules and curing agents. Previous studies have explored the effects of temperature aging on the final mechanical properties of composites, but have been limited by the processing mismatch in compression molding. The research primarily focuses on the effects of forming temperature and ply angle of prepreg on inter‐ply friction behavior at various aging levels. The importance of inter‐ply friction on the forming quality is further discussed through the L‐shaped specimens forming with prepreg compression molding (PCM) process. Firstly, a comprehensive influence of aging on the properties of resin including cure kinetics, gel point, glass transition temperature (Tg) and viscosity of UD prepreg are characterized and discussed. And then, the influence of factors including resin aging, forming temperature and prepreg ply orientation on the inter‐ply friction are discussed. It can be found that the aging of prepreg reduce 26.47% of inter‐ply friction resistance under room temperature, and the increase of temperature can reduce inter‐ply friction resistance by 79.31%. Finally, the effect of aging on the forming quality is researched by PCM formed L‐shaped components. Results indicated that fresh prepreg with 20°C and prepreg with an aging level of 0.4 performed at 95°C exhibited poor formability, while prepreg with aging level of 0.2 at 95°C exhibited the best forming property. In general, this study provides a basic explain and a practical suggestion to the reuse of room temperature aging thermoset prepregs in PCM process.Highlights A comprehensive of basic properties of aged resin were characterized, as the basic principle for inter‐ply friction behavior analysis. The gel point and final mechanical properties of prepreg were tested, for judging the aged materials whether could be used continuously. The inter‐ply friction behaviors of aged prepregs under various forming temperatures were investigated. The influence of layup orientations on the inter‐ply frictional performance with various aging levels were explored. The effect of aging and forming temperature on the PCM formability were studied and a practical suggestion to the reuse of aged thermoset prepregs in PCM process was given.

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Section: Viscosity Testing Of Resin In Prepregmentioning

confidence: 99%

Effect of temperature aging of thermoset UD prepregs on inter‐ply friction behavior and formability in prepreg compression molding process

Zhang,

Han,

Liu

et al. 2024

Polymer Composites

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“…For example, some researchers have explored a compression-pull test method where multiple layers of prepreg are bonded together by pressure and then the force required to separate the layers is measured [33]. Other researchers have measured the force required to remove a probe from the prepreg surface to define the tackiness of the prepreg [34,35]. Both of these methods measure the maximum normal stress during the separation process, which is important for preventing defects such as bubbles and wrinkles in the prepreg [36].…”

Section: Introductionmentioning

confidence: 99%

A Peel Test Method to Characterise the Decay Law of Prepreg Tape Tack at Different Temperatures

Shi,

Wang,

Wang

et al. 2024

Preprint

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Tack is one of the most important factors affecting the operability of prepregs, but it is still very difficult to obtain the change of prepreg tack with time at different temperatures. In this paper, a newly designed T-peel device is used to test the tack decay rate of prepregs at different temperatures. The obtained decay rate deviates less than 8.9% from the manufacturer's data. The maximum deviation of the ratio of tack decay speeds calculated by the Arrhenius equation from the experiments is not higher than -9.7%. It is proved that the present method can obtain the decay rate of tack of prepregs at different temperatures. This method is also applicable to the other two types of prepregs. The article proposes the handling life unit, an operational life measurement unit for prepregs, and establishes that the relationship between tack and remaining shelf life reduces prepreg management costs.

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“…Characterisation of the tack in prepreg composites is primarily carried out using two different test setups: Peel type tests [71,72] and probe tests [73,74]. State-of-the-art for characterising the separation between plies of dry fabric with a binder material is with a t-peel test [75].…”

Section: Inter-ply Separation Behaviourmentioning

confidence: 99%

“…For dry fabrics, a Coulomb frictional model is typically used [94], while prepregs and thermoplastic may consider a viscous slip law [93]. The tack has been described with cohesive laws [29,74]. Similar modelling approaches have been proposed in the literature to study cardboard materials [95].…”

Section: Macro-scale Modelsmentioning

confidence: 99%

Predictive Simulation of the Creation of Wrinkles during Preform Manufacturing

Broberg

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Understanding tack behaviour during prepreg-based composites’ processing

Cited by 11 publications

References 30 publications

Effect of temperature aging of thermoset UD prepregs on inter‐ply friction behavior and formability in prepreg compression molding process

Effect of temperature aging of thermoset UD prepregs on inter‐ply friction behavior and formability in prepreg compression molding process

A Peel Test Method to Characterise the Decay Law of Prepreg Tape Tack at Different Temperatures

Predictive Simulation of the Creation of Wrinkles during Preform Manufacturing

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