Experimental investigation of low-velocity impact behavior and CAI on composite laminates by discrete interleaved toughening

A novel damage tolerance design method of discrete interleaved toughening for laminated composite was proposed. In this paper, discrete thermoplastic Polyamide-6,6 (PA 66) films were deployed at between the selected adjected layers, and three toughening dimensions were considered. Besides, three imp...

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Bibliographic Details
Published in:Mechanics of advanced materials and structures 2024-06, Vol.31 (11), p.2460-2471
Main Authors: Zhang, Cong, Zheng, Xitao, Zhu, Keyu, Peng, Jing, Wang, Zhibang, Lan, Leilei
Format: Article
Language:English
Subjects:
Base plates
CAI strength
Composite laminates
Crack propagation
damage mechanics
Damage tolerance
Delamination
discrete interleaving
impact behavior
Laminar composites
Laminates
Polyamide resins
Propagation
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Summary:A novel damage tolerance design method of discrete interleaved toughening for laminated composite was proposed. In this paper, discrete thermoplastic Polyamide-6,6 (PA 66) films were deployed at between the selected adjected layers, and three toughening dimensions were considered. Besides, three impact positions of specimens were tested under 5 J, 10 J, and 15 J, respectively. The impact behavior and compression after impact (CAI) of specimens were discussed and compared. Experimental results showed that delamination damage was suppressed in the process of propagation outwards across the toughened region, and the path of delamination crack propagation was changed and swerved. Therefore, the delamination damage projected area (DDPA) of all specimens were reduced by 21.09%-62.85%, compared with the non-toughened plate (base plate). In addition, the finding demonstrated that CAI strength is influenced by the delamination position and DDPA. The proposed method could improve the CAI strength by suppressing delamination and swerving the propagation path of delamination. Moreover, the CAI strength of all toughened plates were improved by 16.35%-61.94% in contrast to the related base plates.
ISSN:1537-6494
1537-6532
DOI:10.1080/15376494.2022.2158504