Magnetostrictive properties of epoxy resins modified with Terfenol-D particles for detection of internal stress in CFRP. Part 1: Materials and processes

• Published in: Journal of materials science Vol. 47; no. 15; pp. 5752 - 5759
• Main Authors: Kubicka, M., Mahrholz, T., Kühn, A., Wierach, P., Sinapius, M.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.08.2012; Springer; Springer Nature B.V
• Subjects: Carbon fiber reinforced plastics; Characterization and Evaluation of Materials; Chemical composition; Chemistry and Materials Science; Classical Mechanics; Concentration (composition); Crystallography and Scattering Methods; Dispersions; Epoxy resins; Fiber reinforced polymers; Magnetic properties; Magnetism; Magnetostriction; Materials Science; Organic chemistry; Oxidation; Particle size; Particle size distribution; Polymer Sciences; Polymers; Residual stress; Solid Mechanics; Terfenol alloys; Casting Mould; Particle Size Fraction; Neat Resin; Bead Mill; Roll Mill
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-012-6466-3

Magnetostrictive particles like Terfenol-D are investigated with respect to their ability to detect internal stress, generated in carbon fibre-reinforced polymers (CFRP) in a non-destructive way. The results are presented in two parts. The first part elucidates the ideas for the preparation of dispersions based on these particles with high density in epoxy resins. There is particular focus on the effects of particle size and concentration. Different particle sizes in a range of 0–300 μm are selected by special separation techniques. The particle size distribution is controlled in dry state by laser diffraction method. Changing of the chemical composition, particularly by the oxidation of particles, is analysed by EDX. Use of a magnetic field is identified as a suitable means for the stabilisation of these high-weighted particle fractions dispersed in epoxy resins. The particle size distribution, as well as the alignment of particles, in the cured epoxy resins is investigated by SEM and light microscopy. The second part of the study covers the magnetostrictive properties of the modified epoxy resins which are quantified by the detection of internal stress in CFRP.