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Prediction of manufacturing stresses in thick-walled orthotropic cylinders
Abstract
An analytical method for predicting the residual stress state, resin cure state, and layer locations for filament-wound multilayer, multimaterial, orthotropic cylinders was developed. Submodels have been developed for each sequence in the filament winding process. The submodels developed address the majority of the phenomena affecting the stress and cure state of a filament-wound composite cylinder. Contributions to the existing technology include: (1) Composite layer stiffness model which accounts for radial and meridional stiffness and increasing contribution of the resin as cure progresses. (2) Resin flow model allows axial as well as radial flow through the laminate. (3) Cure kinetics model which predicts viscosity, cure state, and heat of reaction for an epoxy resin at any point in the manufacturing process. (4) Heat transfer model that accounts for resin heat of reaction, cure method, and mandrel configuration. Filament-wound cylinders were manufactured to demonstrate the accuracy of the model. The measured layer locations and residual strain levels were reasonably close to the model's predictions. A sensitivity study was conducted to determine certain process parameters effects on the cylinder's final layer locations and stress state.
Subject Area
Mechanical engineering|Materials science|Aerospace materials
Recommended Citation
Spencer, Brian Eugene, "Prediction of manufacturing stresses in thick-walled orthotropic cylinders" (1988). ETD collection for University of Nebraska-Lincoln. AAI8818660.
https://digitalcommons.unl.edu/dissertations/AAI8818660