GT Lab Delta Pic

Projects: Pressure Vessels | Fluid-Structure | Buckling | Filament WInding

Development of an Improved Filament-Winding Process Model

Research by: David Kokan

Composite materials continue to find application in a wide variety of engineering problems because they provide greatly improved mechanical properties and the flexibility to tailor them. However, their high cost, both in terms of raw materials as well as manufacturing, has been a negative or even prohibitive factor in many applications. Thus it is important to reduce costs while continuing to improve upon overall quality. Furthermore, at a time when concurrent engineering philosophy is being accepted and implemented, design should incorporate as much of the manufacturing process as possible. This is critical in composite processes like filament-winding where the residual stresses associated with fabrication can be as significant as the stresses encountered during service. Thus, the optimum design is dependent upon manufacturing conditions as well as service loads.

These have been motivating factors in the development of simulation models for composite processing. The objective of this research is to develop and experimentally validate a model of the filament-winding process. Although the approach is multidisciplinary, the focus of this work has been on the materials and mechanics issues. Of particular interest is the cure/time/temperature dependent response of the thermosetting matrix during processing and methods to predict residual stresses based upon this response. It is assumed that the composite consists of elastic fibers in a viscoplastic cure-dependent thermosetting matrix. The model predicts temperature, degree of cure, matrix viscosity, deformation, and stresses as a function of position and time throughout the winding and curing processes.

For additional details regarding the preceding work, contact David Kokan at:

Projects: Pressure Vessels | Fluid-Structure | Buckling | Filament WInding
© 1997 David Kokan,
Georgia Institute of Technology, All Rights Reserved.
© 1997 Kurt Gramoll,
The University of Oklahoma, All Rights Reserved.