A Stusy of the Dielectric and Mechanical Property Interactions of Glass-Cloth/Epoxy Composites

Some dielectric properties of a commercially produced epoxy resin reinforced by two layers of glass cloth are investigated as a function of mechanical stress in order to study the basic dielectric characteristics of composite insulating materials. Because of voids and delaminations, the dielectric strength of the composites are noticeably affected by applied mechanical stresses. It is also shown that for equal levels of tensile stress, the extent of changes in dielectric strength depends on the orientation of the glass yarns with respect to the axis of the applied forces.