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Dissertation
Mechanical behavior of hybrid steel and glass fibre composites
Authors: --- ---
Year: 2013 Publisher: Leuven : K.U. Leuven. Faculteit Ingenieurswetenschappen

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Abstract

The mechanical behavior of hybrid glass and steel fiber composites is investigated by interlayer hybridization. The goal is to isolate different effects on the possible hybrid effect and analyze the differences. The three effects that are analysed, are the influence of the matrix ductility, the ratio of steel/glass fibers and the stacking order. The effect of the matrix will mainly be influenced by difference in delamination strength. A low delamination strength will result in high delamination length with a high total strain as a result. If the delamination length is limited, the strain will be localised in the delaminated zone and failure will occur at lower measured strains. This behavior is succesfully modeled when the delamination will preferably take place at the steel/glass interface.Because of the difference in thermal expansion coefficient between glass and steel, compressive stresses will be present after production on the glass fibers. This will postpone the failure of glass fibers. This effect is enhanced if the glass layers are mixed between the steel layers and if the steel/glass ratio is increased. Of course also the production temperature will have a large influence. Multiple fractures of the glass fibers are observed in the hybrids with a high steel/glass ratio, regardless of the stacking order. As a result the stress will remain higher compared with the rule of mixture. This is a positive hybrid effect. The stacking order will have a large influence on the length of the delaminations. A lot of steel/glass interfaces will result in a smaller delamination length. Also the damage to the steel fibers due to the fracture of the glass fibers will be higher if the glass fibers are mixed more between the steel fibers. Smaller delamination length and more damage will result in a smaller total strain.

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