Compression characteristics and failure mechanism of thin-walled stiffened composite structures with node interface delamination defect

Xinbo Zhang; Yuanchen Li; Ling Zhang; Yao Xu; Panding Wang; Hongshuai Lei

doi:10.1117/12.3047660

27 September 2024 Compression characteristics and failure mechanism of thin-walled stiffened composite structures with node interface delamination defect

Xinbo Zhang, Yuanchen Li, Ling Zhang, Yao Xu, Panding Wang, Hongshuai Lei

Author Affiliations +

Proceedings Volume 13261, Tenth International Conference on Mechanical Engineering, Materials, and Automation Technology (MMEAT 2024); 1326119 (2024) https://doi.org/10.1117/12.3047660
Event: 10th International Conference on Mechanical Engineering, Materials, and Automation Technology (MMEAT 2024), 2024, Wuhan, China

Abstract

Stiffened composite panels are widely used in aerospace applications as primary load-bearing components. However, internal laminar defects in these panels can severely impact their mechanical properties. This study investigated the compressive failure mechanism of orthotropic grid-stiffened composite plates. To explore the impact of node interface delamination defects on macroscopic deformation behavior and failure modes, in-plane compression tests were conducted on four typical components. This was followed by an analysis of the macro-microscopic failure morphology of the composites. The results indicated that the failure mode of the stiffened panel plays a crucial role in its ultimate load-carrying capacity. Interface delamination defects at cross nodes had a minimal effect on the load-carrying capacity of small-sized local specimens, leaving their deformation and failure modes unchanged. Yet, these defects significantly compromised the local stiffness and failure modes of large-sized stiffened panels, causing a transition from compression failure to global buckling and local shear failure. Compared to defect-free components, the strength and stiffness decreased by 59.2% and 38.6%, respectively. These results offer valuable insights for the initial design, strength assessment, and damage tolerance design of such stiffened plates.

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Xinbo Zhang, Yuanchen Li, Ling Zhang, Yao Xu, Panding Wang, and Hongshuai Lei "Compression characteristics and failure mechanism of thin-walled stiffened composite structures with node interface delamination defect", Proc. SPIE 13261, Tenth International Conference on Mechanical Engineering, Materials, and Automation Technology (MMEAT 2024), 1326119 (27 September 2024); https://doi.org/10.1117/12.3047660

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KEYWORDS

Composites

Failure analysis

Interfaces

Deformation

Materials properties

Design

Carbon

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