Shear Characterisation of UD Thermoplastic Composites

Sebastiaan Haanappel, Ulrich Sachs, R.H.W. ten Thije, Bert Rietman, Remko Akkerman

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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Abstract

Intra-ply shear is one of the main mechanisms to accumulate deformations in thermoplastic composites forming processes. In this paper a shear characterisation method for uni-directionally (UD) reinforced thermoplastics in their molten configuration is presented. Bar-like specimens made from UD carbon PEEK material are subjected to oscillating torsional loads. By utilising linear visco-elastic theory, the small strain oscillatory responses are translated to storage and loss shear moduli. The frequency dependent moduli are subsequently translated to the transient domain and show a close-to elastic response for the considered instantaneous strain rates. The application of such characterisation data is demonstrated by modelling the stamp forming process of a complex shaped product with the aid of the finite element method. The process considered deals with an initially flat quasi-isotropic laminate consisting of eight plies, which is formed at high temperatures. Predicted intra-ply shear strains are compared with those measured by photogrammetry in a real formed part. Predicted and measured shear strain distributions and their magnitudes were in good agreement. Moreover, critical regions in which small wrinkles develop were indeed indicated by the forming predictions.
Original languageEnglish
Title of host publication11th International Conference on Flow Processing in Composite Materials (FPCM-11)
EditorsSimon Bickerton, Piaras Kelly
Place of PublicationAuckland, New Zealand
PublisherUniversity of Auckland
Pages-
Number of pages8
Publication statusPublished - 2012
Event11th International Conference on Flow Processes in Composite Materials, FPCM-11 2012 - University of Auckland, Auckland, New Zealand
Duration: 9 Jul 201212 Jul 2012
Conference number: 11

Publication series

Name
PublisherThe University of Auckland

Conference

Conference11th International Conference on Flow Processes in Composite Materials, FPCM-11 2012
Abbreviated titleFPCM
CountryNew Zealand
CityAuckland
Period9/07/1212/07/12

Fingerprint

Shear strain
Thermoplastics
Polyether ether ketones
Photogrammetry
Composite materials
Laminates
Molten materials
Strain rate
Elastic moduli
Finite element method
Carbon
Temperature

Keywords

  • METIS-294476
  • IR-81728

Cite this

Haanappel, S., Sachs, U., ten Thije, R. H. W., Rietman, B., & Akkerman, R. (2012). Shear Characterisation of UD Thermoplastic Composites. In S. Bickerton, & P. Kelly (Eds.), 11th International Conference on Flow Processing in Composite Materials (FPCM-11) (pp. -). Auckland, New Zealand: University of Auckland.
Haanappel, Sebastiaan ; Sachs, Ulrich ; ten Thije, R.H.W. ; Rietman, Bert ; Akkerman, Remko. / Shear Characterisation of UD Thermoplastic Composites. 11th International Conference on Flow Processing in Composite Materials (FPCM-11). editor / Simon Bickerton ; Piaras Kelly. Auckland, New Zealand : University of Auckland, 2012. pp. -
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abstract = "Intra-ply shear is one of the main mechanisms to accumulate deformations in thermoplastic composites forming processes. In this paper a shear characterisation method for uni-directionally (UD) reinforced thermoplastics in their molten configuration is presented. Bar-like specimens made from UD carbon PEEK material are subjected to oscillating torsional loads. By utilising linear visco-elastic theory, the small strain oscillatory responses are translated to storage and loss shear moduli. The frequency dependent moduli are subsequently translated to the transient domain and show a close-to elastic response for the considered instantaneous strain rates. The application of such characterisation data is demonstrated by modelling the stamp forming process of a complex shaped product with the aid of the finite element method. The process considered deals with an initially flat quasi-isotropic laminate consisting of eight plies, which is formed at high temperatures. Predicted intra-ply shear strains are compared with those measured by photogrammetry in a real formed part. Predicted and measured shear strain distributions and their magnitudes were in good agreement. Moreover, critical regions in which small wrinkles develop were indeed indicated by the forming predictions.",
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Haanappel, S, Sachs, U, ten Thije, RHW, Rietman, B & Akkerman, R 2012, Shear Characterisation of UD Thermoplastic Composites. in S Bickerton & P Kelly (eds), 11th International Conference on Flow Processing in Composite Materials (FPCM-11). University of Auckland, Auckland, New Zealand, pp. -, 11th International Conference on Flow Processes in Composite Materials, FPCM-11 2012, Auckland, New Zealand, 9/07/12.

Shear Characterisation of UD Thermoplastic Composites. / Haanappel, Sebastiaan; Sachs, Ulrich; ten Thije, R.H.W.; Rietman, Bert; Akkerman, Remko.

11th International Conference on Flow Processing in Composite Materials (FPCM-11). ed. / Simon Bickerton; Piaras Kelly. Auckland, New Zealand : University of Auckland, 2012. p. -.

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

TY - GEN

T1 - Shear Characterisation of UD Thermoplastic Composites

AU - Haanappel, Sebastiaan

AU - Sachs, Ulrich

AU - ten Thije, R.H.W.

AU - Rietman, Bert

AU - Akkerman, Remko

PY - 2012

Y1 - 2012

N2 - Intra-ply shear is one of the main mechanisms to accumulate deformations in thermoplastic composites forming processes. In this paper a shear characterisation method for uni-directionally (UD) reinforced thermoplastics in their molten configuration is presented. Bar-like specimens made from UD carbon PEEK material are subjected to oscillating torsional loads. By utilising linear visco-elastic theory, the small strain oscillatory responses are translated to storage and loss shear moduli. The frequency dependent moduli are subsequently translated to the transient domain and show a close-to elastic response for the considered instantaneous strain rates. The application of such characterisation data is demonstrated by modelling the stamp forming process of a complex shaped product with the aid of the finite element method. The process considered deals with an initially flat quasi-isotropic laminate consisting of eight plies, which is formed at high temperatures. Predicted intra-ply shear strains are compared with those measured by photogrammetry in a real formed part. Predicted and measured shear strain distributions and their magnitudes were in good agreement. Moreover, critical regions in which small wrinkles develop were indeed indicated by the forming predictions.

AB - Intra-ply shear is one of the main mechanisms to accumulate deformations in thermoplastic composites forming processes. In this paper a shear characterisation method for uni-directionally (UD) reinforced thermoplastics in their molten configuration is presented. Bar-like specimens made from UD carbon PEEK material are subjected to oscillating torsional loads. By utilising linear visco-elastic theory, the small strain oscillatory responses are translated to storage and loss shear moduli. The frequency dependent moduli are subsequently translated to the transient domain and show a close-to elastic response for the considered instantaneous strain rates. The application of such characterisation data is demonstrated by modelling the stamp forming process of a complex shaped product with the aid of the finite element method. The process considered deals with an initially flat quasi-isotropic laminate consisting of eight plies, which is formed at high temperatures. Predicted intra-ply shear strains are compared with those measured by photogrammetry in a real formed part. Predicted and measured shear strain distributions and their magnitudes were in good agreement. Moreover, critical regions in which small wrinkles develop were indeed indicated by the forming predictions.

KW - METIS-294476

KW - IR-81728

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BT - 11th International Conference on Flow Processing in Composite Materials (FPCM-11)

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Haanappel S, Sachs U, ten Thije RHW, Rietman B, Akkerman R. Shear Characterisation of UD Thermoplastic Composites. In Bickerton S, Kelly P, editors, 11th International Conference on Flow Processing in Composite Materials (FPCM-11). Auckland, New Zealand: University of Auckland. 2012. p. -