Analysis of transport phenomena governing interfacial bonding and void dynamics during thermoplastic tow-placement

Pitchumani, R.; Ranganathan, Sridhar; Don, Roderic C.; Gillespie, John W.; Lamontia, Mark A.

doi:10.1016/0017-9310(95)00271-5

Cited by 114 publications

(116 citation statements)

References 9 publications

Supporting

Mentioning

116

Contrasting

Order By: Relevance

“…Bonding models therefore require a detailed history of the coupled temperature and pressure history from the nip point onwards. Furthermore, other factors such as residual stress [6], void dynamics [7][8][9][10], crystallinity [11,12], and degradation [11,13] are all highly dependent on the temperature history.…”

Section: Introductionmentioning

confidence: 99%

A combined optical-thermal model for near-infrared laser heating of thermoplastic composites in an automated tape placement process

Stokes-Griffin

Compston

2015

Composites Part A: Applied Science and Manufacturing

115

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

A combined optical-thermal model for near-infrared laser heating of thermoplastic composites in an automated tape placement process

Stokes-Griffin

Compston

2015

Composites Part A: Applied Science and Manufacturing

115

View full text Add to dashboard Cite

“…Heating: for thermoplastic composites, intense heating needs to be done at the NIP area. Heating is usually done using a hot gas (nitrogen) torch, or a laser [10,11]. For machines using the hot gas torch, the temperature at the nozzle o C. This temperature can drop significantly at the NIP point.…”

Section: Particular Characteristics Of Afp For Thermoplastic Compositesmentioning

confidence: 99%

“…The degree of intimate contact varies from 0 (no intimate contact) to 1 (full intimate contact). To have full intimate contact, not only does the pressure need to be sufficient, but there should also be sufficient time for it to occur [10].…”

Section: Particular Characteristics Of Afp For Thermoplastic Compositesmentioning

confidence: 99%

Automated manufacturing of composites

Hoa¹

2018

VJSTE

View full text Add to dashboard Cite

Abstract:Long fibre reinforced polymer composite materials have found many applications in many industries, such as aerospace, automotive, marine, wind turbine, and sports. Techniques for the manufacturing of structures used in these industries have been mainly Hand Lay Up (HLU), and Liquid Composite Moulding. While there are a few automated methods of manufacturing, such as Filament Winding and Pultrusion, these techniques are restricted to make structures that consist of surfaces of revolution, or fibres that are aligned only along one direction. The conventional methods of manufacturing of composites are therefore very restricted, either in slow rate of production, or in the shapes of structures that can be made. The advent of Automated fibre Placement (AFP) machines and automated tape lay up machines have brought forward new capabilities where structures of different shapes may be manufactured at relatively higher speeds. This paper presents an overview of the applications of AFP for the processing of structures made from thermoset matrix and thermoplastic matrix composites. Advantages and disadvantages, along with issues associated with the use of this new technique in the processing of each type of material will be discussed.

show abstract

“…The forces applied to each roller can also be independently controlled so that pressures are generated in the material to reduce void content. Process models for this tow-placement head configuration, including heat transfer, consolidation and bonding, have been developed and can now accurately predict optimal process conditions [2,3] Quality sensors for the tow-placement technique have not yet been developed for real-time monitoring of in-situ void content and polymer interdiffusion [4]. However, the current state of the material can be predicted using accurate process models.…”

mentioning

confidence: 99%

Model Based Predictive Control for the Tow-Placement Technique

Heider

Gillespie

1998

Review of Progress in Quantitative Nondestructive Evaluation

View full text Add to dashboard Cite

lNfRODUCTIONAutomated thermoplastic tow-placement is a non-autoclave, composite manufacturing technique developed for aerospace structures where processing of high temperature composites is required. It promises improved and reliable [mal part quality as well as cost reduction using an automated robot system. At the Center for Composite Materials a lab-scale wOlkcell consists of an ABB robot, a tow-placement head and an AGEMA thermal camera where process models and control systems can be developed and validated.The automated tow-placement head, includes a two roller, two hot nitrogen gas torch approach, that provides nip point heating as well as consolidation force (Figure 1). The incoming thermoplastic tape is heated up under the preheater and a first bonding of the tow on the substrate occurs under the laydown roller. Then, bonding strength is increased through thru-thickness heating of the material under the main torch. Finally, porosity is minimized under the consolidation roller.Quality of the material is quantified in terms of void content and degree of bonding between insitu consolidated layers. Process set-points consist of torch heights, velocity, consolidation forces, temperatures of the rollers and the tool. The amount of energy transferred to the material is determined by independently controlled nozzle heights [1] and deposition rate. The forces applied to each roller can also be independently controlled so that pressures are generated in the material to reduce void content. Process models for this tow-placement head configuration, including heat transfer, consolidation and bonding, have been developed and can now accurately predict optimal process conditions [2,3] Quality sensors for the tow-placement technique have not yet been developed for real-time monitoring of in-situ void content and polymer interdiffusion [4]. However, the current state of the material can be predicted using accurate process models. This software sensor provides the

show abstract

Analysis of transport phenomena governing interfacial bonding and void dynamics during thermoplastic tow-placement

Cited by 114 publications

References 9 publications

A combined optical-thermal model for near-infrared laser heating of thermoplastic composites in an automated tape placement process

A combined optical-thermal model for near-infrared laser heating of thermoplastic composites in an automated tape placement process

Automated manufacturing of composites

Model Based Predictive Control for the Tow-Placement Technique

Contact Info

Product

Resources

About