Composite layup effect on the failure mechanism of single lap bonded joints

Kupski, J.A.; Teixeira De Freitas, S.; Zarouchas, D.; Camanho, P. P.; Benedictus, R.

doi:10.1016/j.compstruct.2019.02.093

Composite layup effect on the failure mechanism of single lap bonded joints

Title

Composite layup effect on the failure mechanism of single lap bonded joints

Author

Kupski, J.A. (TU Delft Structural Integrity & Composites)
Teixeira De Freitas, S. (TU Delft Structural Integrity & Composites)
Zarouchas, D. (TU Delft Structural Integrity & Composites)
Camanho, P. P. (Universidade do Porto; INEGI)
Benedictus, R. (TU Delft Aerospace Structures & Materials)

Department

Aerospace Structures & Materials

Date

2019

Abstract

Single lap bonded joints with four different composite adherend stacking sequences were tested and numerically simulated. The aim was to evaluate the effect of the layups on the quasi-static tensile failure of the bonded joints. The study shows that increasing the adherends bending stiffness postpones the damage initiation in the joint. However, this is no longer valid for final failure. The ultimate load is influenced by how the damage progresses. For similar bending stiffness, a layup that leads to the crack propagating from the adhesive towards the inside layers of the composite increases the ultimate load. The failure mode is highly influenced by the orientation of the interface lamina in contact with the adhesive, such that, a 0° interface ply causes failure within the bond line, while a 90° interface ply causes failure inside the composite adherend. Finally, it is concluded that a quasi-isotropic layup may not be the best choice in terms of tensile joint strength. In order to improve tensile strength up to damage initiation, the layup should be optimized for bending stiffness, while up to final failure, a stacking sequence that yields to a complex crack path inside the composite can lead to higher ultimate loads.

Subject

Composite bonded joints
Composite layup variation
Single lap joints

To reference this document use:

http://resolver.tudelft.nl/uuid:4dbedb7d-fb0e-4d7d-9fc2-b003529bee2e

DOI

https://doi.org/10.1016/j.compstruct.2019.02.093

ISSN

0263-8223

Source

Composite Structures, 217, 14-26

Part of collection

Institutional Repository