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MecSol 2017
6th International Symposium on Solid Mechanics
PREDICTION OF SHAPE DISTORTIONS IN ANGLED COMPOSITE STRUCTURES
Submission Author:
olumide Mayowa makinde , SP
Co-Authors:
Alfredo Faria, Mauricio Donadon
Presenter: olumide Mayowa makinde
doi://10.26678/ABCM.MecSol2017.MSL17-0013
Abstract
Shape distortions, which are also known as spring in, are a major source of problems for composite manufacturers. These shape distortions are usually accompanied by built up residual stresses. They can deform a component so that it becomes useless. It also has the capability to reduce the strength of the structure. In this paper, a three-dimensional version of the plane-strain constitute model originally proposed by Svanberg and Homberg is employed to predict the shape distortions of various L-shaped composite structures. The model takes into account important mechanisms such as thermal expansion, resin shrinkage and frozen-in strains developed during curing cycles. The model was implemented into ABAQUS Finite Element code as a user subroutine UMAT. The macromechanical properties of each composite layer were predicted using a micromechanics based approach, implemented into MATLAB. A very good agreement between predictions obtained using the proposed 3D model, experimental and numerical results available in the open literature was found. Additionally, a parametric study was also performed on L shaped angled composite structures with different variations in order to evaluate their effects of the residual stresses developed during the curing process on the final geometry of the component. The simple regression model developed from the study enabled the predictions of spring in while taking into account various contributions of fiber volume, initial angle and inner radius of the composite part. The model is fairly accurate and can predict comfortably the spring in of various L shaped structures.
Keywords
Residual stresses, Shape distortions, Composites, Finite Elements, spring in
