Vacuum-bag processing of sandwich structures: role of honeycomb pressure level on skin-core adhesion and skin quality

Non-autoclave processing of honeycomb sandwich structures generally leads to poor compaction and high porosity of the skins, along with a decreased skin-core adhesion. The pressure level inside the honeycomb cells plays an important role and is controlled by the permeability to air of the skins. In this work, an initial range of skin permeability to air was explored by perforating the prepregs and adhesive layer selectively. The role of the resulting pressure inside the honeycomb on skin?core adhesion and skin quality was evaluated. Prepreg air permeability was found to control skin-core adhesion through the pressure in the honeycomb and potential outgassing of the adhesive layer. An optimal range of initial pressure inside the honeycomb was found to be 40?70 kPa. A universal process window was proposed to determine the time frame of vacuum application leading to an optimal initial honeycomb pressure level.


Published in:
Composites Science and Technology, 70, 5, 797-803
Year:
2010
Publisher:
Elsevier
ISSN:
0266-3538
Keywords:
Note:
[Tavares, S. Sequeira Caillet-Bois, N. Michaud, V. Manson, J. -A. E.] Ecole Polytech Fed Lausanne, Lab Technol Composites & Polymeres, CH-1015 Lausanne, Switzerland. Manson, JAE, Ecole Polytech Fed Lausanne, Lab Technol Composites & Polymeres, CH-1015 Lausanne, Switzerland.
ISI Document Delivery No.: 584LE
Times Cited: 1
Cited Reference Count: 30
Tavares, S. Sequeira Caillet-Bois, N. Michaud, V. Manson, J. -A. E.
Swiss National Science Foundation [200020-105169]; Portuguese Foundation for Science and Technology [SFRH/BD/32662/2006]
This work was supported by the Swiss National Science Foundation, under Project No. 200020-105169. Decision S.A. is acknowledged for fruitful discussions, and Mr S. Schenk for studying the impact of producing samples with one skin during his studies S Sequeira Tavares acknowledges the Portuguese Foundation for Science and Technology, Grant SFRH/BD/32662/2006.
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 Record created 2010-01-25, last modified 2018-10-07

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