期刊
APPLIED COMPOSITE MATERIALS
卷 18, 期 5, 页码 449-465出版社
SPRINGER
DOI: 10.1007/s10443-010-9175-6
关键词
3D braided composites; Damage; Interfaces; Cohesive zone model; Finite element modeling
资金
- National Natural Science Foundation of China [N10772060, 90916027]
- Hei Longjiang Province Outstanding Youth Foundation of China [JC 2006-13]
A Representative Volume Cell (RVC) chosen to epitomize the entire three dimensional four-directional braided composites is investigated to evaluate the mechanical behavior of the material by computational micromechanics. In addition to including several damage modes of braid yarn and matrix within the braided composites, the numerical model also takes into account interface damage mode by using a Cohesive Zone Model (CZM). A parametrical study is conducted to evaluate the influence of interface properties on the macro stress-strain curve and the interaction of different failure modes of the braided composites under uniaxial tensile loading. The interface damage evolution of the braided composites with large braid angle is also provided further. Preliminary results indicate that the interface damage, which is one of the key factors to cause the nonlinearity of the stress-strain relationship, can decrease the elastic modulus but not obviously control the ultimate strength of the braided composites with large braid angle.
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