Thermomechanical and Electrical Properties of Fabric Reinforced Laminates with Filled Stratified Epoxy Matrix

Abstract

The thermal coefficient of linear expansion, the electrical conductivity and dielectric permittivity of fabric reinforced hybrid composites with filled stratified epoxy matrix were investigated. The measurements of electrical conductivity and dielectric permittivity had been performed, using standard method regarding electrical resistance and electrical capacity. In order to point out the effect of filler and of the spatial distribution of reinforcement layers, the medial layer of fabric was especially prepared by introducing copper wires in the woven. So, the medial layer is made of different types of tows (carbon, aramid, glass). This attempt is made in order to design a composite able to provide information about its state during various loading. The results showed that the fillers did not improve the electrical parameters of epoxy matrix, but they led to reduce the thermal coefficient of linear expansion. The thermal and electrical behavior of hybrid composites varied in dependence of number of carbon layers and fiber orientation.

Tensile Behaviour of Fabric Reinforced Laminates and Plies

“…It has to be mentioned that all the presented and studied materials are plane fabrics. With these materials plies and laminates were formed on the basis of Epiphen RE4020-DE4020, an epoxy system with gel time of 45 min recommended both for casting and coating and we used in many studies [40][41][42][43][44]. Having this relative long gel time the Epiphen epoxy system is suitable to be used both for casting and for forming laminates via wet lay-up technique.…”

An Experimental Investigation of Thermal Properties of Fabric Reinforced Epoxy Composites

“…The woven geometry of this mixed carbon/aramid fibers fabric represents 2 carbon fiber yarns: 1 aramid fiber yarn in the warp direction and 1 carbon fiber yarn: 2 aramid fiber yarns in the weft direction. The modification of mixed fabric was performed by replacing of each second aramid fiber in the weft direction with a glass fiber with linear density of 200tex and a https://doi.org/10.37358/MP.20.2.5362 tinned copper wire with the diameter of 0.2 mm [24,25]. This hybrid fabric was realized for the medial layer of studied composite materials.…”

Specific Heat and Thermal Expansion Coefficient of Hybrid Epoxy Composites

“…This mixed fabric presented a woven geometry of 2 carbon yarns alternated by 1 aramid yarn (2:1) in the warp direction and 1 carbon yarn alternated by 2 aramid yarns (1:2) in the weft direction. The transformation of this fabric was performed handmade by replacement in the weft direction of each second aramid yarn with a 200tex fiberglass and a 0.2mm diameter tinned copper wire [27,28]. In order to enhance the adherence capacity of the fibers for the improvement of the properties and quality of fiber-matrix interface and to remove impurities, the plain fabrics were treated by uniform spaying with solutions made of detergent, sodium hydroxide and perchloric acid and then after each treatment were cleaned with water.…”