Abstract
A new type of plug, namely, load-control attachment was proposed to control energy absorption capability of carbon fiber reinforced plastic (CFRP) laminate. The attachment consists of inner and outer curvature constrainers, which guides both surfaces of the CFRP laminate under crushing. Quasi-static compression tests of unidirectional CFRP laminated tubes were performed by applying the attachment. It was revealed that the CFRP could show more than twice of specific energy absorption than that ever reported when attachment of R_o, R_i=0.2mm was used. On the other hand, minimum specific energy absorption of 8kJ/kg was shown when attachment of R_o, R_i=5.8mm was used. The CFRP tube showed wide range capability of energy absorption from 8 to 178kJ/kg by changing the attachment without changing constituent or stacking sequence of the CFRP. The extent of the fiber fracture due to bending could be controlled by the curvatures of the attachment. The energy absorption due to delamination and splitting was small as compared with fiber fracture. Load-control attachment for plate-type CFRP laminate was also developed and fracture process of the CFRP was observed from its side. The fracture process of CFRP in the load-control attachment was revealed correspond with load-displacement curve.
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