Axial crushing behaviors of composite pre-folded tubes made of KFRP/CFRP hybrid laminates: Fid-Bau Portal

Axial crushing behaviors of composite pre-folded tubes made of KFRP/CFRP hybrid laminates

Ye, Haitao / Zhou, Xiang / Ma, Jiayao / Wang, Hai / You, Zhong

Abstract In this paper, the crushing behaviors of composite pre-folded tubes made of KFRP/CFRP hybrid laminates subjected to quasi-static axial loads are investigated both experimentally and numerically. The full-diamond origami pattern and its variation forms with curved lobes are considered for the tube design. Five pre-folded tube specimens with different ply stacking sequences consisting of CFRP and KFRP woven fabrics are manufactured and tested in quasi-static axial compression tests. The finite element models for pre-folded tubes made of KFRP/CFRP hybrid laminates are developed and validated with the experimental results. A comprehensive parametric study on the energy absorption properties of CFRP/KFRP hybrid composite tubes with various geometries is performed numerically. The results show that the energy absorption performance of the composite tubes has a strong correlation with the composition of hybrid fiber and the specimen with the stacking sequence of $[0_{k}^{°} / 0_{c}^{°} / 0_{c}^{°} / 0_{k}^{°}]$ has the best overall energy absorption performance among the five specimens tested. Moreover, it is found that by converting the standard full-diamond pattern to the curved variation forms, the energy absorption performance of the pre-folded tubes can be improved.

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Highlights • Pre-folded composite tubes with different hybrid layups are manufactured and tested. • The FE models of pre-folded hybrid KFRP/CFRP tubes are developed and validated with experimental results. • Parametric studies on the energy absorption behaviors of pre-folded hybrid KFRP/CFRP tubes are conducted. • The relationship between the energy absorption performance and the collapse modes of pre-folded KFRP/CFRP tubes is discussed.