期刊
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
卷 -, 期 -, 页码 -出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/15376494.2022.2158504
关键词
Composite laminates; discrete interleaving; delamination; damage mechanics; impact behavior; CAI strength
类别
资金
- Aeronautical Science Foundation of China [201909053001]
- Fundamental Research Funds for the Central Universities [D5000220029]
- Fundamental Research Funds of Shaanxi Key Laboratory of Artificially-Structured Functional Materials and Devices [AFMD-KFJJ-21212]
A novel damage tolerance design method of discrete interleaved toughening for laminated composite was proposed in this paper. The method involved deploying discrete thermoplastic PA 66 films between selected adjacent layers and considering three toughening dimensions. Experimental results showed that the method effectively suppressed delamination damage and changed the path of delamination crack propagation, leading to a significant reduction in the delamination damage projected area and an improvement in the compression after impact strength.
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.
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