Experimental Study on the Out-of-Plane Deformation of Symmetrical Flat Laminate Composites Manufactured through Autoclave Process - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2021

Experimental Study on the Out-of-Plane Deformation of Symmetrical Flat Laminate Composites Manufactured through Autoclave Process

Bruno Castanié
Philippe Olivier

Résumé

Out-of-plane deformation generally develops for laminate composites during autoclave processing due to unbalanced residual stress in the stacking [1-4]. This can lead to undesired shape and poor dimensional control in part manufactured. This paper presents a study on out-of-plane deflection of symmetrical flat laminate composites. The effect of stacking sequences and tool surface conditions were taken into account. Firstly, the unidirectional prepreg M21EV/IMA was chosen as a raw material for composite manufacturing, aluminum was selected for a mold material in order to maximize the coefficient of thermal expansion of mold. Freekote release agent, PTFE release film and peel ply were used to modify tool surface condition. Afterward, the specimens with an overall size 250x250 mm2 and different layups cross-ply ([0/90]s) and angle-ply ([45/-45/45/-45]) were manufactured. Tool surface was classified into four conditions: 1) Freekote and one layer release film, 2) Freekote and one layer peel ply, 3) Freekote and two layers release film, 4) Freekote and three layers release film. In addition, four specimens were manufactured for each configuration of tool surface, thus, 16 specimens of cross-ply and angle-ply were done. Other process parameters such as mold material, curing temperature profile and autoclave pressure are identical. Digital image correlation (DIC) and laser displacement sensor were utilized to measure the out-of-plane deflection of all specimens in order to ensure the accuracy of measurement by comparison of both methods. Technically, the DIC can assist to examine the behavior of warpage and to indicate maximum and minimum values for magnitude of deformation while laser displacement sensor is supportive to search for the maximum deformation by measuring 17 points on each specimen. The correlation for both measurement methods is in good agreement. It can be clearly seen that the effect of stacking layup plays an important role for the out of plane deflection in term of shape and magnitude. Angle-ply laminates show much higher deformation than cross-ply laminates, twist shape was observed for angle-ply while cylindrical and rotated cylindrical shape were observed for cross-ply. In term of tool surface effect, the difference of tool surface conditions has no significant effect for angle-ply laminates while the use of peel ply provides a little higher deflection for cross-ply laminates compared to the use of one, two and three layers release film. Moreover, the difference in deformation behavior when using peel ply and release film can be clearly observed for cross-ply laminates.
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Dates et versions

hal-03407609 , version 1 (28-10-2021)

Identifiants

  • HAL Id : hal-03407609 , version 1

Citer

Lerdwongpaisan Arnon, Bruno Castanié, Philippe Olivier. Experimental Study on the Out-of-Plane Deformation of Symmetrical Flat Laminate Composites Manufactured through Autoclave Process. 24th International Conference on Composite Structures (ICCS24) Faculty of Engineering, University of Porto, Portugal, Jun 2021, Porto, Portugal. ⟨hal-03407609⟩
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