期刊
COMPOSITE STRUCTURES
卷 280, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2021.114917
关键词
Homogenization; Stiffness; 2D triaxially braided composite; Local stiffness; Undulating yarn
资金
- National Natural Science Foundation of China [11702041]
- Natural Science Foundation of Chongqing [cstc2020jcyj-msxmX0097]
- Fundamental Research Funds for the Central Universities [2020CDJ-LHSS-005]
- Student Research Training Program of Chongqing University [CQU-SRTP-2020377]
This study investigates a two-level homogenization of the macroscopic stiffness of 2DTBC, focusing on the roles of local stiffness model and undulating average scheme. The effective elastic property of braid yarn is rigorously derived by an energy method, and predictions using a simple rule of mixture and stiffness undulating average scheme show the most consistent agreement with experimental results.
This work investigates a two-level homogenization of the macroscopic stiffness of the 2DTBC with emphasizes on the roles of the local stiffness model and undulating average scheme. The effective elastic property of the braid yarn is rigorously derived by an energy method instead of intuitive mathematical average methods in the literature. General formulations of the compliance and stiffness undulating average schemes have been obtained, which are proven to be reduced to the simple mathematical average methods in certain cases. Validated with different experiments, it is unexpected to find out that the prediction combined with the simple rule of mixture and stiffness undulating average scheme yields the most consistent agreement with experimental results after the overall assessment of all the in-plane engineering elastic constants under various braiding conditions.
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