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Experimental study of partially-cured Z-pins reinforced foam core composites:K-Cor sandwich structures

Chinese Journal of Aeronautics 2014年第1期27卷 153-159页

作者： Zheng Yingying Xiao Jun Duan Mufeng Li Yong College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics

This paper presents an experimental study of a novel K-Cor sandwich structure rein- forced with partially-cured Z-pins. The influence of pultrusion processing parameters on Z-pins characteristics was studied and the effect of Z-pins on mechanical properties was disclosed. Differential scanning calorimetry （DSC） and optical microscopy （OM） methods were employed to determine the curing degree of as-prepared Z-pins and observe the implanted Z-pins in the K-Cor structure. These partially-cured Z-pins were treated with a stronger bonding link between face sheets and the foam core by means of a hot-press process, thereby decreasing burrs and cracking defects when the Z-pins were implanted into the Rohacell foam core. The results of the out-of-plane tensile tests and the climbing drum peel （CDP） tests showed that K-Cor structures exhibited superior mechanical performance as compared to X-Cor and blank foam core. The observed results of failure modes revealed that an effective bonding link between the foam core and face sheets that was provided from partially-cured Z-pins contributed to the enhanced mechan- ical performances of K-Cor sandwich structures.

关键词： Composite materials K-Cor sandwich structuresMechanical performance Partially-cured Z-pins foam core composites

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