A DIELECTRIC SPECTROSCOPY METHOD OF DIRECTLY ASSESSING COMPOSITE MICRO-STATE EVOLUTION DURING MANUFACTURING AND DEFORMATION

摘要

The object of the present work is to establish a foundation for the design and manufacturing of composite materials for combined mechanical, thermal, and electrical applied conditions. The present paper will discuss a new non-invasive interrogation method for establishing not only internal integrity but also the nature and distribution of internal material structure and defect morphology changes by applying broadband dielectric spectroscopy to detect conductivity and permittivity changes during the history of loading. Interpretations of the results by analysis of discrete local details, and by the introduction of a generalized compliance method will be presented. Prognosis methods based on the technique will also be discussed. Data and examples of application of the method for woven glass reinforced polymer matrix materials will be presented. Opportunities for application of the method to design for durability in multi-physics applications will be identified.