Graded interphases for enhanced dielectric and mechanical strength of fiber-reinforced composites

Purpose and goal:

The objective of the project is the development of approaches to reduce stress concentrations in the interphase in order to increase the durability of composite structures.This will be achieved by fiber surface modification for a gradation of the interphase to avoid the distinct stiffness difference occurring between fiber and matrix.

Expected results and effects:

Power transformers and switchgears are key components made of high-performance composites used in power grids. Their mechanical but also dielectric composite strength is strongly determined by the fiber-matrix interphase as the origin of micro-scale damage. The project addresses the need for new methodologies and validation tools for interphase optimization required in all composite market sectors to gain knowhow in the complex field of interphase formation, their stress transfer capability and damage behavior.

Approach and implementation:

The research within the project is interdisciplinarity, it will be carried out in close collaboration between involved partners. The project will be implemented based on interlinked work packages (WP) with active exchange of know-how. Apart from management/dissemination the following WPs are defined: 1) Benchmarking of materials; 2) Manufacturing of fibers with modified surfaces; 3) Interphase modelling by multi-scale analysis of composite materials; 4) Interphase optimization for enhanced composite behavior; 5) Evaluation of industrial performance and method transfer.