Journal
COMPOSITE STRUCTURES
Volume 295, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2022.115636
Keywords
Thin-ply; Hybrid design; Bolted joints; Fatigue; Damage mechanism
Categories
Funding
- National Natural Science Foundation of China [51905443, 51875476, 52175450, 92067205]
- Fundamental Research Funds for the Central Universities [31020200503003]
- Key R&D plan of Shaanxi Province [2020ZDLGY01-04]
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This study investigates the fatigue behavior and damage mechanism of symmetrical thin/thick laminate-titanium joints. It finds that combining thick plies with a number of thin plies significantly improves fatigue performance, reduces deformation, delays damage, and suppresses the propagation of cracks.
Thin-ply composites have attracted increasing attention from researchers due to their higher damage tolerance and delamination suppression. This paper presents a detailed investigation of the fatigue behaviour and damage mechanism of symmetrical thin/thick hybrid design laminate-titanium joints under tension-tension loading. Laminates with four different configurations, thick, thick-thin-thick, thin-thick-thin and thin, were designed. According to the quasi-static bearing limit of the thick-ply laminates joints, fatigue testing of each hybrid joint was carried out at two load levels for a certain number of cycles. The deformation and damage of the hybrid joint were characterized by scanning electron microscopy (SEM). With thick plies and the addition of a number of thin plies, the hybrid design laminates can significantly improve the fatigue performance. Stacking thin-ply on the outermost layers of the laminate is more meaningful for double-lap joints than the use of thin-ply joints in the middle. Under an identical number of cycles, the deformation around a hole in the thin-ply laminate is only approximately 50% of that of the thick ply. The damage is delayed, and the propagation of inter- and intralaminar cracks is suppressed in the thin-ply laminates, resulting in the best fatigue resistance and less delamination under the two fatigue loads.
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