Treffer: Variable stiffness composite patch for single-sided bonded repair of composite structures.

Among several composite repair methods, single-sided bonded patch repair is a simple and time-effective method, but its post-repair tensile strength is usually low compared to that of double-sided repair and scarf repair. Despite the tensile loading, out-of-plane bending deformation is inevitable owing to the step-like load path and generates peel stress in the adhesive layer. This study proposes a variable stiffness (VS) patch that mitigates steep stiffness changes at the edge of the patch using a curvilinear fiber orientation and verifies its effectiveness in delaying patch debonding. The damage progress in the single-sided repaired quasi-isotropic CFRP laminate under tensile loading was predicted using three-dimensional finite element analysis with cohesive elements. Although patches debonded from one end in the loading direction, the VS patch with low stiffness near the end obtained a smaller out-of-plane deformation and a higher debonding onset strain than those of the standard quasi-isotropic patch. Furthermore, tensile tests of patch-repaired CFRP specimens demonstrated an increase in the debonding onset strain by the VS patch with a small variation. These results confirmed the effectiveness of the VS patch in the single-sided bonded repair of composite structures. [ABSTRACT FROM AUTHOR]

Copyright of Advanced Composite Materials is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Volltext ist im Gastzugang nicht verfügbar. Login für vollen Zugriff.