Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
SHAPE DISTORTION PREDICTIONS OF CURVED SANDWICH PANELS: A PARAMETRIC STUDY
Submission Author:
olumide Mayowa makinde , SP
Co-Authors:
Alfredo Faria, Mauricio Donadon, olumide Mayowa makinde
Presenter: olumide Mayowa makinde
doi://10.26678/ABCM.COBEM2017.COB17-1557
Abstract
The residual stresses that develop during the manufacture of fibre reinforced composite panels lead to shape distortions, which are also known as spring-in. These distortions are a major source of problems for composite manufacturers. Consequently, the ability to effectively and efficiently predict these distortions is always desired. In this paper, process induced shape distortions for various sandwich curved panels was predicted with the aid of the constitutive model originally proposed by Svanberg and Holmberg. The model is implemented as user defined material model within solid elements in ABAQUS. Several factors, which include variation in the radius of curvature, stacking sequence (UD, Cross laminate and Quasi isotropic laminate), fibre volume fraction and percentage of core material used, were considered in the simulations. From the results obtained, a regression-based parametric study was done. Additionally, a stacking sequence modification coefficient was introduced based on statistical analysis of the FEA results. By incorporating this coefficient, the regression-based model can be used to predict the distortions of any stacking sequence investigated. The model was validated against the FEA solutions with relative accuracy. This work provides a platform to develop proactive control techniques for manufacturing curved sandwich composite panels with improved dimensional tolerance for aerospace structures applications
Keywords
Residual stresses, Shape distortions, Composites, Curved Panels, spring in
