Effect of in situ treatment on the quality of flat thermoplastic composite plates made by automated fiber placement (AFP)

Shadmehri, Farjad; Hoa, Suong V.; Fortin-Simpson, Jeffrey; Ghayoor, Hossein

doi:10.1080/20550340.2018.1444535

Cited by 15 publications

(19 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…AFP workcell and flat paddle tool at Concordia Centre for Composites (CONCOM) developed by [12,45]. Figure 7 depicts the experimental trials setup used in this paper.…”

Section: Methodsmentioning

confidence: 99%

“…Over the past few years, the advent of automated fiber placement (AFP) has increasingly attracted the interests of industry due to faster rate of deposition, lower cost and repeatability of the process [1][2][3][4][5][6][7][8][9][10][11][12]. Thermoplastic composites offer many attractive characteristics such as high fracture toughness, better recyclability and good temperature resistance as compared to thermoset matrix composites [1,13,14].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Heat transfer analysis of automated fiber placement of thermoplastic composites using a hot gas torch

Tafreshi

Hoa

Shadmehri

et al. 2019

Advanced Manufacturing: Polymer & Composites Science

View full text Add to dashboard Cite

With more and more use of composites in engineering applications, the need for automated composites manufacturing is evident. The use of automated fiber placement (AFP) machine for the manufacturing of thermoplastic composites is under rapid development. In this technique, a moving heat source (hot gas torch, laser, or heat lamp) is melting the thermoplastic composite tape and consolidation occurs in situ. Due to the rapid heating and cooling of the material, there are many issues to be addressed. First is the development of the temperature distribution in different directions which gives rise to temperature gradients. Second is the quality of the bond between different layers, and third is the rate of material deposition to satisfy industrial demand. This paper addresses the first issue. The temperature distribution affects the variation in crystallinity, and residual stresses throughout the structure as it is being built. The result is the distortion of the composite laminate even during the process. In order to address this problem, first the temperature distribution due to a moving heat source needs to be determined. From the temperature distribution, the development and distribution of crystallinity, residual stresses and deformation of the structure can then be determined. As the first phase of the work, this paper investigates the temperature distribution due to a moving heat source for thermoplastic composites, without considering the material deposition. A finite difference (FD) code based on energy balance approach is developed to predict the temperature distribution during the process. Unidirectional composite strips are manufactured using AFP and fast-response K-type thermocouples (response time of 0.08 s, as compared to normal thermocouples with response time of 0.5 s) are used to determine the thermal profiles in various locations through the thickness of the composite laminate subjected to a moving heat source. It is shown that temperature variations measured experimentally during the heating pass, using thermocouples embedded into the composite substrate, underneath layers of the composite material, are consistent with the generated thermal profiles from the numerical model. The temperature distribution, in both the direction of the tape and through-thickness direction can be predicted numerically.

show abstract

“…AFP workcell and flat paddle tool at Concordia Centre for Composites (CONCOM) developed by [12,45]. Figure 7 depicts the experimental trials setup used in this paper.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Heat transfer analysis of automated fiber placement of thermoplastic composites using a hot gas torch

Tafreshi

Hoa

Shadmehri

et al. 2019

Advanced Manufacturing: Polymer & Composites Science

View full text Add to dashboard Cite

show abstract

“…However, specimens consolidated using autoclave showed the best performance for all the properties studied, especially for the mechanical properties. Comparing the findings from [95] and [94], it can be seen that the effect of the repass treatment depends on the heat source used. For laser ISC, due to the high heating and cooling rate, a repass treatment was required to increase the crystallinity.…”

Section: Studies On Factors Affecting In Situ Consolidation Qualitymentioning

confidence: 97%

“…Factors affecting the morphology include the degree of crystallinity, spherulite size and crystalline orientation [8]. Many researchers use the degree of crystallinity as a means of studying the morphology [51,53,94,95]. For PEEK, tensile strength and stiffness increases with increasing crystallinity but fracture toughness decreases at the same time [8].…”

Section: Modeling Crystallization and Other Aspects Of Frtp In Situ Consolidationmentioning

confidence: 99%

“…The repass was performed to ensure that the prepreg tapes could bond well at the corners. Shadmehri et al also studied the application of repass treatments in the AFP process with hot gas torch ISC [95]. The repass treatment was found to reduce the surface roughness of the resulting FRTP component.…”

Section: Studies On Factors Affecting In Situ Consolidation Qualitymentioning

confidence: 99%

See 1 more Smart Citation

Review: Filament Winding and Automated Fiber Placement with In Situ Consolidation for Fiber Reinforced Thermoplastic Polymer Composites

2021

View full text Add to dashboard Cite

Fiber reinforced thermoplastic composites are gaining popularity in many industries due to their short consolidation cycles, among other advantages over thermoset-based composites. Computer aided manufacturing processes, such as filament winding and automated fiber placement, have been used conventionally for thermoset-based composites. The automated processes can be adapted to include in situ consolidation for the fabrication of thermoplastic-based composites. In this paper, a detailed literature review on the factors affecting the in situ consolidation process is presented. The models used to study the various aspects of the in situ consolidation process are discussed. The processing parameters that gave good consolidation results in past studies are compiled and highlighted. The parameters can be used as reference points for future studies to further improve the automated manufacturing processes.

show abstract

Crystallinity studies of PEKK and carbon fibre/PEKK composites: A review

Pérez-Martín

Mackenzie

Baidak

et al. 2021

Composites Part B: Engineering

View full text Add to dashboard Cite

Effect of in situ treatment on the quality of flat thermoplastic composite plates made by automated fiber placement (AFP)

Cited by 15 publications

References 13 publications

Heat transfer analysis of automated fiber placement of thermoplastic composites using a hot gas torch

Heat transfer analysis of automated fiber placement of thermoplastic composites using a hot gas torch

Review: Filament Winding and Automated Fiber Placement with In Situ Consolidation for Fiber Reinforced Thermoplastic Polymer Composites

Crystallinity studies of PEKK and carbon fibre/PEKK composites: A review

Contact Info

Product

Resources

About