Study on Three⁃point Bending Properties of Foam Sandwich Composites under Different Reinforcement Methods

doi:10.19491/j.issn.1001-9278.2021.02.004

Abstract

Abstract:

This paper reported an investigation on the three-point bending properties of the foam sandwich composites prepared through stitching and rib reinforcement methods. A three-point bending experiment was carried out with a universal testing machine for the seamed and unstitched carbon fiber， glass fiber， and glass-carbon hybrid fiber foam sandwich composites， with the corresponding load-deflection curves presented in the paper. The flexural properties of the seamed carbon fiber foam sandwich composites were further studied by means of a reinforcing rib method. The results indicated that the performance of the glass-carbon hybrid fiber foam sandwich composites was improved in comparison with the glass fiber foam sandwich composites. The introduction of reinforcing ribs increased the bending strength of the stitched carbon fiber foam sandwich composites from 17.79 MPa to 37.47 MPa. The bending performance of the stitched carbon fiber foam sandwich composite was improved with an increase in the number of reinforcement ribs. At the same number of reinforcement ribs， the sandwich composites achieved optimum bending strength of 46.96 MPa when the reinforcement ribs were laid in parallel. Next was under the 20 ° cross-laying of the reinforcement ribs and least was under the cross-laying of the reinforcement ribs.

Key words: foam sandwich structure, fiber reinforcement, matrix rib, flexural behavior

CLC Number:

TQ323.5

HE Peixi, LAI Jiamei, WAN Yibiao, ZHAO Chenxu, HUANG Zhichao. Study on Three⁃point Bending Properties of Foam Sandwich Composites under Different Reinforcement Methods[J]. China Plastics, 2021, 35(2): 22-28.

Figures/Tables 13

Fig.1. Improved lock stitching process

Fig.2. Hybrid fiber foam sandwich composite model

Fig.3. Schematic diagram of process laying

Fig.4. Schematic diagram of rib laying inside foam layer in stitched carbon fiber foam sandwich composites

Fig.5. Schematic diagram of the three?point bending

Fig.6. Stitched/unstitched carbon fiber,glass fiber and glass/carbon mixed fiber foam sandwich composite load?deflection curve

Fig.7. Damage form of bending

Fig.8. Load?deflection curve of stitched carbon fiber foam sandwich composites with different numbers of matrix ribs

Fig.9. Load?deflection curve of stitched carbon fiber foam sandwich composites under different placement forms of matrix ribs

Fig.10. Flexural strength diagram of unstitched and stitched glass,carbon and hybrid fiber foam sandwich composite

Fig.11. Flexural modulus diagram of unstitched and stitched glass,carbon and hybrid fiber foam sandwich composites

Fig.12. Flexural strength diagram of stitched carbon fiber foam sandwich composite with the matrix ribs

Fig.13. Flexural modulus diagram of stitched carbon fiber foam sandwich composite with matrix ribs

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