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 ofrncomposite materials for combined mechanical, thermal, and electrical applied conditions. Thernpresent paper will discuss a new non-invasive interrogation method for establishing not onlyrninternal integrity but also the nature and distribution of internal material structure and defectrnmorphology changes by applying broadband dielectric spectroscopy to detect conductivity andrnpermittivity changes during the history of loading. Interpretations of the results by analysis ofrndiscrete local details, and by the introduction of a generalized compliance method will bernpresented. Prognosis methods based on the technique will also be discussed. Data and examplesrnof application of the method for woven glass reinforced polymer matrix materials will bernpresented. Opportunities for application of the method to design for durability in multi-physicsrnapplications will be identified.