Effect of ply orientation on bond strength in fiber-placed composites

    Research output: Contribution to conferencePaper

    4 Citations (Scopus)
    101 Downloads (Pure)

    Abstract

    The Laser-Assisted Fiber Placement (LAFP) process is an additive manufacturing technique with the potential for out-of-autoclave manufacturing. A thermoplastic composite pre-impregnated tape is heated with a laser above melting temperature and subsequently pressure is applied via a roller to bond the tape to previously laid down plies. LAFP offers the opportunity to combine the stacking and the consolidation, thereby reducing cost and process time compared to conventional processes, such as autoclave and press-consolidation. However, the consolidation quality achieved with LAFP is not yet at the same level as the conventional processes. One of the measures of consolidation quality is the interlaminar bond strength. The mandrel peel test is used as a method to quantify the effects of process parameters on the interlaminar bond strength. The aim is to optimize the interlaminar bond strength achieved and to increase the understanding of governing bonding mechanisms. A LAFP robot was used to place carbon/PEEK tapes onto pre-consolidated substrates with various laser power settings and two different top ply fiber orientations. The fracture toughness of the bond was measured using the mandrel peel test. The results showed that the fracture toughness strongly depends on laser power. Underheating and overheating resulted in a decline in fracture toughness and the highest fracture toughness of about 1.30 kJ/m2 was obtained for a nippoint temperature of around 500C. A similar maximum fracture toughness at equal laser power settings was measured for both 0 and 90 top ply orientations. However, the process window of the 90 top ply orientation seems to be smaller.

    Original languageEnglish
    Publication statusPublished - 1 Jan 2015
    Event20th International Conference on Composite Materials 2015 - Copenhagen, Denmark
    Duration: 19 Jul 201524 Jul 2015
    Conference number: 20
    http://www.iccm20.org/

    Conference

    Conference20th International Conference on Composite Materials 2015
    Abbreviated titleICCM 2015
    CountryDenmark
    CityCopenhagen
    Period19/07/1524/07/15
    Internet address

    Fingerprint

    Bond strength (materials)
    Fibers
    Lasers
    Composite materials
    Fracture toughness
    Consolidation
    Tapes
    Autoclaves
    3D printers
    Polyether ether ketones
    Fiber reinforced materials
    Thermoplastics
    Melting point
    Carbon
    Robots
    Substrates

    Keywords

    • Fracture toughness
    • Laser-assisted fiber placement
    • Thermoplastic composites

    Cite this

    Kok, T., Grouve, W. J. B., Warnet, L. L., & Akkerman, R. (2015). Effect of ply orientation on bond strength in fiber-placed composites. Paper presented at 20th International Conference on Composite Materials 2015, Copenhagen, Denmark.
    Kok, Thijs ; Grouve, Wouter J.B. ; Warnet, Laurent L. ; Akkerman, Remko. / Effect of ply orientation on bond strength in fiber-placed composites. Paper presented at 20th International Conference on Composite Materials 2015, Copenhagen, Denmark.
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    title = "Effect of ply orientation on bond strength in fiber-placed composites",
    abstract = "The Laser-Assisted Fiber Placement (LAFP) process is an additive manufacturing technique with the potential for out-of-autoclave manufacturing. A thermoplastic composite pre-impregnated tape is heated with a laser above melting temperature and subsequently pressure is applied via a roller to bond the tape to previously laid down plies. LAFP offers the opportunity to combine the stacking and the consolidation, thereby reducing cost and process time compared to conventional processes, such as autoclave and press-consolidation. However, the consolidation quality achieved with LAFP is not yet at the same level as the conventional processes. One of the measures of consolidation quality is the interlaminar bond strength. The mandrel peel test is used as a method to quantify the effects of process parameters on the interlaminar bond strength. The aim is to optimize the interlaminar bond strength achieved and to increase the understanding of governing bonding mechanisms. A LAFP robot was used to place carbon/PEEK tapes onto pre-consolidated substrates with various laser power settings and two different top ply fiber orientations. The fracture toughness of the bond was measured using the mandrel peel test. The results showed that the fracture toughness strongly depends on laser power. Underheating and overheating resulted in a decline in fracture toughness and the highest fracture toughness of about 1.30 kJ/m2 was obtained for a nippoint temperature of around 500◦C. A similar maximum fracture toughness at equal laser power settings was measured for both 0◦ and 90◦ top ply orientations. However, the process window of the 90◦ top ply orientation seems to be smaller.",
    keywords = "Fracture toughness, Laser-assisted fiber placement, Thermoplastic composites",
    author = "Thijs Kok and Grouve, {Wouter J.B.} and Warnet, {Laurent L.} and Remko Akkerman",
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    Kok, T, Grouve, WJB, Warnet, LL & Akkerman, R 2015, 'Effect of ply orientation on bond strength in fiber-placed composites' Paper presented at 20th International Conference on Composite Materials 2015, Copenhagen, Denmark, 19/07/15 - 24/07/15, .

    Effect of ply orientation on bond strength in fiber-placed composites. / Kok, Thijs; Grouve, Wouter J.B.; Warnet, Laurent L.; Akkerman, Remko.

    2015. Paper presented at 20th International Conference on Composite Materials 2015, Copenhagen, Denmark.

    Research output: Contribution to conferencePaper

    TY - CONF

    T1 - Effect of ply orientation on bond strength in fiber-placed composites

    AU - Kok, Thijs

    AU - Grouve, Wouter J.B.

    AU - Warnet, Laurent L.

    AU - Akkerman, Remko

    PY - 2015/1/1

    Y1 - 2015/1/1

    N2 - The Laser-Assisted Fiber Placement (LAFP) process is an additive manufacturing technique with the potential for out-of-autoclave manufacturing. A thermoplastic composite pre-impregnated tape is heated with a laser above melting temperature and subsequently pressure is applied via a roller to bond the tape to previously laid down plies. LAFP offers the opportunity to combine the stacking and the consolidation, thereby reducing cost and process time compared to conventional processes, such as autoclave and press-consolidation. However, the consolidation quality achieved with LAFP is not yet at the same level as the conventional processes. One of the measures of consolidation quality is the interlaminar bond strength. The mandrel peel test is used as a method to quantify the effects of process parameters on the interlaminar bond strength. The aim is to optimize the interlaminar bond strength achieved and to increase the understanding of governing bonding mechanisms. A LAFP robot was used to place carbon/PEEK tapes onto pre-consolidated substrates with various laser power settings and two different top ply fiber orientations. The fracture toughness of the bond was measured using the mandrel peel test. The results showed that the fracture toughness strongly depends on laser power. Underheating and overheating resulted in a decline in fracture toughness and the highest fracture toughness of about 1.30 kJ/m2 was obtained for a nippoint temperature of around 500◦C. A similar maximum fracture toughness at equal laser power settings was measured for both 0◦ and 90◦ top ply orientations. However, the process window of the 90◦ top ply orientation seems to be smaller.

    AB - The Laser-Assisted Fiber Placement (LAFP) process is an additive manufacturing technique with the potential for out-of-autoclave manufacturing. A thermoplastic composite pre-impregnated tape is heated with a laser above melting temperature and subsequently pressure is applied via a roller to bond the tape to previously laid down plies. LAFP offers the opportunity to combine the stacking and the consolidation, thereby reducing cost and process time compared to conventional processes, such as autoclave and press-consolidation. However, the consolidation quality achieved with LAFP is not yet at the same level as the conventional processes. One of the measures of consolidation quality is the interlaminar bond strength. The mandrel peel test is used as a method to quantify the effects of process parameters on the interlaminar bond strength. The aim is to optimize the interlaminar bond strength achieved and to increase the understanding of governing bonding mechanisms. A LAFP robot was used to place carbon/PEEK tapes onto pre-consolidated substrates with various laser power settings and two different top ply fiber orientations. The fracture toughness of the bond was measured using the mandrel peel test. The results showed that the fracture toughness strongly depends on laser power. Underheating and overheating resulted in a decline in fracture toughness and the highest fracture toughness of about 1.30 kJ/m2 was obtained for a nippoint temperature of around 500◦C. A similar maximum fracture toughness at equal laser power settings was measured for both 0◦ and 90◦ top ply orientations. However, the process window of the 90◦ top ply orientation seems to be smaller.

    KW - Fracture toughness

    KW - Laser-assisted fiber placement

    KW - Thermoplastic composites

    UR - http://www.scopus.com/inward/record.url?scp=85040178501&partnerID=8YFLogxK

    M3 - Paper

    AN - SCOPUS:85040178501

    ER -

    Kok T, Grouve WJB, Warnet LL, Akkerman R. Effect of ply orientation on bond strength in fiber-placed composites. 2015. Paper presented at 20th International Conference on Composite Materials 2015, Copenhagen, Denmark.