Research on the influence of structural parameters on the joint performance of hybrid bonded-bolted joint for CFRP with three bolts

doi:10.19936/j.cnki.2096-8000.20230928.010

Abstract

Abstract: The influence mechanism of different structural parameters on the joint performance of carbon fiber reinforced composite (CFRP) hybrid bonded-bolted joint with three bolts was investigated by experiments and numerical simulations. The finite element model based on the three-dimensional Hashin failure criterion was established, and the failure area of the joint was observed with the help of the ultra-depth of field device Keyence VHX-6000. The influence of lap length, bolt hole spacing and clearance fit relationship on the joint connection performance was explored. The results show that increasing the lap length can transfer the stress distribution from the edge of the joint to the middle of the joint, and improve the joint performance by 29.9%. Reducing the spacing of bolt holes can improve the connection performance of the bonding area at both ends of the joint, and the joint performance is increased by 15%. Because of the uneven force of the three bolts, so when the two bolt holes are clearance fit, the force of the middle bolt can be increased, and the joint performance is improved by 6.9%. The joint performance increases with the increase of lap length, but the growth rate gradually decreases to zero. With the increase of bolt hole spacing, the joint strength increases slowly at first and then decreases rapidly, and the optimal bolt hole spacing is 15 mm. When the bolts at both ends are clearance fit, the connection performance of the joint can be increased. The optimal bolt hole diameter is 5.2 mm.

Key words: composite material, hybrid bonded-bolted joint, structural parameters, connection performance, damage behavior

CLC Number:

TB332

YANG Xiaodong, SHI Jianwei, CHEN Dong, LI Cheng. Research on the influence of structural parameters on the joint performance of hybrid bonded-bolted joint for CFRP with three bolts[J]. COMPOSITES SCIENCE AND ENGINEERING, 2023, 0(9): 67-72.

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