Abstract
Composite sandwich structures are widely used in many fields. T-joint plays a significant role in the composite sandwich structural connection. In this paper, a type of adhesive T-joint was manufactured and tested under bending and shearing load. According to the experiment, the finite element model was established to reveal the failure process. A strength prediction model was proposed based on the simulation. The results showed that the T-joint’s lower connector and the web’s lower face panel controlled its maximum load-bearing capacity, and the failure mode is the fiber compressive damage. The predicted ultimate bearing capacity of the T-joint showed a good agreement with the simulation, and the maximum relative error was less than 3%.
Highlights
The composite sandwich structure has become a potential lightweight alternative option in aviation, aerospace, navigation, construction, vehicle engineering, rail transit, and other fields due to its excellent specific stiffness, specific strength, functional integration, and designability
The results showed that the different combinations of face and core would make the failure modes various
The results show that the bearing capacity of the composite T-joint is mainly determined by the failure mode, which can be realized by reducing the filling rate of the T-joint fillet or changing the initiation and propagation path of delamination cracks between fillet and rib
Summary
The composite sandwich structure has become a potential lightweight alternative option in aviation, aerospace, navigation, construction, vehicle engineering, rail transit, and other fields due to its excellent specific stiffness, specific strength, functional integration, and designability. Hou et al [2], Bedon [3], Zhao et al [4], and Fan et al [5] subjected the sandwich panels with different lattice cores to edgewise compression loading. The interfacial properties between core and face sheets affect the overall property of the panels significantly. Global buckling, interface debonding, local buckling, or strength fracture may occur. Bending load is another major load that the structure needs to bear. The results showed that the different combinations of face and core would make the failure modes various. The sandwich panels with good bending and edgewise compressing properties would provide a good load-bearing capacity if the connections are strong enough
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