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

Important results from the project

The objective was to to gain knowledge of the formation, structure and extension of interphases, stress transfer and damage behavior on micro-, meso-, macro- scales. New methodologies/tools were established and new questions about the effect of composites manufacturing on the dielectrical strength, interphase-thickness relation on strength were raised. Overall, project goals were met. The experimental technique developed at LTU lead to cooperation between IPF, LTU, Hitachi Energy and RISE.

Expected long term effects

The project strengthens LTU’s long-term ability to lead and join research and industrial initiatives through unique expertise in composite analysis. Hitachi Energy gains tools for faster, more efficient material development, enabling cost savings and improved product performance. Their collaboration fosters future innovation in sustainable, high-performance materials for energy systems, supporting competitiveness and economic growth.

Approach and implementation

The project involved all partners through regular online and in-person meetings, including lab tours to share facilities and methods. Experimental work was coordinated via frequent bilateral exchanges. Decisions were made jointly or by relevant teams. Material and data transfers between Hitachi, IPF, and LTU were smooth, enabling efficient collaboration across testing, simulation, and manufacturing.