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Applied Composite Materials

, Volume 19, Issue 6, pp 885–899 | Cite as

Relationships Between LRI Process Parameters and Impact and Post-Impact Behaviour of Stitched and Unstitched NCF Laminates

  • Alvine Njionhou
  • Florentin Berthet
  • Bruno CastaniéEmail author
  • Christophe Bouvet
Article
  • 324 Downloads

Abstract

The general context of the development of out-of-autoclave processes in the aeronautics industry raises the question of the possible links between these new processes and impact behaviour. In this study, a Taguchi table was used in a design of experiment approach to establish possible links. The study focused on the liquid resin infusion process applied to laminates made with stitched or unstitched quadri-axial carbon Non-Crimp Fabric (NCF). On the basis of previous studies and an analysis of the literature, five process parameters were selected (stitching, curing temperature, preform position, number of highly porous media, vacuum level). The impact energy was set at 35 J in order to obtain enough residual dent depth. The parameters analysed during and after impact were: maximum displacement of the impactor, energy absorbed, permanent indentation depth, and delaminated surface. Then, compression after impact tests were performed and the corresponding average stress was measured. The interactions found by statistical analysis show a very high sensitivity to stitching, which was, of course, expected. A very significant influence of curing temperature and a significant influence of preform position were also found on the permanent indentation depth and a physical explanation is provided. Globally, it was demonstrated that the resin infusion process itself did not influence the impact behaviour.

Keywords

Liquid Resin Infusion Non-Crimp Fabric Impact Compression after impact 

Nomenclature

Co

Stitching process parameter

NHPM

Number of High Porous Media (HPM) process parameter

Cp

Plate side process parameter

Tc

Curing temperature process parameter

VL

Vacuum level process parameter

Ea

Energy absorbed during impact

Ee

Elastic energy

Sd

Delaminated surface

δmax

Maximum displacement of the impactor

αp

Residual dent depth

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Alvine Njionhou
    • 1
    • 4
  • Florentin Berthet
    • 1
    • 4
  • Bruno Castanié
    • 2
    • 4
    Email author
  • Christophe Bouvet
    • 3
    • 4
  1. 1.Ecole des Mines d’Albi (EMAC)Albi cedex 09France
  2. 2.INSAToulouse CedexFrance
  3. 3.ISAEToulouse CedexFrance
  4. 4.Université de Toulouse, INSA, UPS, Mines d’Albi, ISAE, ICA (Institut Clément Ader)ToulouseFrance

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