On the Analysis and Control of Dimensional Instabilities in Polymer Composites

概要

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This paper gives an overview of the main issues that need to be considered for the analysis of dimensional instabilities in polymer composites. Dimensional instabilities are the result of the evolution of internal stresses and strains in a material during and after processing. Their analysis must start with a systematic and comprehensive identification of the mechanisms leading to changes in shape and internal stress for a given material. These mechanisms lead to a material behavior that depends on the stress state, temperature, time, and age of the polymer matrix after processing. This first step defines the scope of the required analytical models. The choice of thermomechanical models should be based not only on their precision, but also on the possibility to couple models for different mechanisms, and the possibility of integrating them into a numerical analysis software for the structural analysis of composite parts. The analytical approach is outlined, with an emphasis on issues specific to polymer composites. This paper further describes methods for the measurement of long-term dimensional changes in composite parts. It finally points out concrete measures that can be implemented to counter dimensional instability problems.
湘南工科大学の論文
1997-03-25