Comparison of analytical approaches predicting the compressive strength of fibre reinforced polymers

Common analytical models to predict the unidirectional compressive strength of fibre reinforced polymers are analysed in terms of their accuracy. Several tests were performed to determine parameters for the models and the compressive strength of carbon fibre reinforced polymer (CFRP) and glass fibre reinforced polymer (GFRP). The analytical models are validated for composites with glass and carbon fibres by using the same epoxy matrix system in order to examine whether different fibre types are taken into account. The variation in fibre diameter is smaller for CFRP. The experimental results show that CFRP has about 50% higher compressive strength than GFRP. The models exhibit significantly different results. In general, the analytical models are more precise for CFRP. Only one fibre kinking model’s prediction is in good agreement with the experimental results. This is in contrast to previous findings, where a combined modes model achieves the best prediction accuracy. However, in the original form, the combined modes model is not able to predict the compressive strength for GFRP and was adapted to address this issue. The fibre volume fraction is found to determine the dominating failure mechanisms under compression and thus has a high influence on the prediction accuracy of the various models.

Subjects

fibre reinforced polymer

compression

analytical models

prediction

shear properties

microbuckling

kinking

glass fibres

carbon fibres

DDC Class

540: Chemie

620: Ingenieurwissenschaften

Funding(s)

Open Access Publizieren 2018 - 2019 / TU Hamburg

More Funding Information

Deutsche Forschungsgemeinschaft (DFG)

Publication version

publishedVersion

Lizenz

https://creativecommons.org/licenses/by/4.0/

Name

materials-11-02517.pdf

Size

681.55 KB

Format

Adobe PDF

Options

Comparison of analytical approaches predicting the compressive strength of fibre reinforced polymers