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Ultra-stiff and strong composites for structures with complex geometries

Reference number
Coordinator CHALMERS TEKNISKA HÖGSKOLA AKTIEBOLAG - Industri- och materialvetenskap
Funding from Vinnova SEK 800 000
Project duration October 2018 - June 2019
Status Completed
Venture The strategic innovation programme SIP LIGHTer

Purpose and goal

The material developed finds its inspiration in nature. Nature’s structural materials feature high stiffness, strength and damage tolerance. These materials uses staggered stiff inclusions embedded in a soft matrix, where the stiff inclusion carries the load and provides stiffness. Whereas the thin soft matrix transfers loads via shear and provides slip-planes in the material. Furthermore, the inclusions are considered two-dimensional materials as they have large length to thickness aspect ratios.

Expected effects and result

Here, we mimic the discontinuous architecture of natural composites to realise significantly stiffer and stronger man-made composites than ever before. Here, ultra-high modulus CFRP thin tapes constitute the stiff two-dimensional inclusions. Given the tape thickness of approximately 20 micrometre, very high volume fractions of the stiff tapes can be achieved. Use of short, thin, tapes is found to allow processing of structures from ultra-high modulus carbon fibres. Process needs to be improved to allow us to manufactur compsoites with fibre volume fractions of 60% or higher.

Planned approach and implementation

The project team collaborated in the material development and analyses to demonstrate 200 micrometre thick isotropic composite plates with stiffness in the range of 90-160 GPa, strength of 640-935 MPa and strain to failure (c.f. first-ply-failure) in the range 0.4-1.5% depending on the choice of fibre.

The project description has been provided by the project members themselves and the text has not been looked at by our editors.

Last updated 24 October 2018

Reference number 2018-02856

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