Effect of Adhesive Thickness on the Mechanical Property of Adhesively Bonded Corrugated Structure under Three-point Bending Load

doi:10.3901/JME.2023.02.104

Abstract

Abstract: The corrugated-cored sandwich structure adopts a lightweight and thin-walled structural design method, and can thus be used as a load-bearing and energy-absorbing structure to be applied to the front longitudinal beam of the automobile chassis and the Y-shaped beam of vehicle body, while study on the effect of bondline thickness on the mechanical performance is absent in currently published literatures. Sandwich corrugated structures were manufactured through structural adhesive bonding and then loaded under quasi-static three-point bending up to failure, to analyse the effect of adhesive thickness on the overall load-bearing capacity and energy absorption behaviour. It was found that the structural load-bearing capacity and fracture behaviour varied with different adhesive thicknesses. Comparing to adhesive thickness of 0.5 mm and 1.0 mm, the sandwich structure with 0.2 mm adhesive thickness showed better mechanical performance and stability. Finite element model was established considering Cohesive Zone Model in adhesive layer, realising the simulation on the three-point bending loading process on the bonded corrugated structure. The experimental and numerical results were compared and proved the validity of the FE modelling approach. The presented methodology can reliably aid the structural design and performance evaluation of adhesively bonded light-metal corrugated structure.

Key words: corrugated-core sandwich, cohesive zone model, finite element modelling, fracture mechanics, crack propagation

CLC Number:

TH114

HAN Xiao, SUN Liangliang, LIU Bo, LIU Zheyuan, WU Chengwei. Effect of Adhesive Thickness on the Mechanical Property of Adhesively Bonded Corrugated Structure under Three-point Bending Load[J]. Journal of Mechanical Engineering, 2023, 59(2): 104-112.

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