摘要
通过四步法三维编织和真空辅助树脂模塑成型工艺(VARTM)制备三维五向编织复合材料T型梁试件,并在MTS 810.23型测试系统上测试其80%应力水平下的弯曲疲劳性能。根据三维五向编织复合材料T型梁的真实细观结构,建立大型精细实体模型,用有限元法研究三维五向编织复合材料T型梁在低周循环载荷下的弯曲疲劳性质。结果表明:疲劳加载过程中,轴纱为主要的承力部件;厚度方向上,材料从面板至加强筋处应力先减小后增大;长度方向上,应力从试样中间位置向两侧扩展;加强筋处纤维的拉伸断裂为材料在80%应力水平下失效的主要模式。此研究方法可进一步扩展至其他复杂横截面复合材料结构件的抗疲劳设计。
The three-dimensional（3-D） and five-directional braided T-shaped composite was manufactured with the 3-D four-step braiding method and the vacuum assisted resin transfer molding（VARTM） process. The bending fatigue behavior of the composite under 80% stress level was tested on the MTS 810.23 material system. The large scale fine model was created based on the real microstructure of the 3-D five-directional braided T-shaped composite. The finite element analysis method was applied to study the bending fatigue property of the composite under low cycle load. It is found that the axial yarn is the major load bearing part,and the stress decreases and then increases from the flange to the web along the thickness direction, and the stress extends from the middle part to the side along the length direction. The tensile breakage of the fiber in the web is the main failure mode of the composite under80% stress level. This study can be extended to the fatigue design of other composite structures with complex cross section.
作者
欧阳屹伟
王海楼
顾伯洪
孙宝忠
OUYANG Yiwei;WANG Hailou;GU Bohong;SUN Baozhong(College of Textiles,Donghua University;Key Laboratory of Textile Science ＆ Technology,Ministry of Education,Donghua University,Shanghai 201620,China)
出处
《东华大学学报（自然科学版）》
CAS
CSCD
北大核心
2018年第3期347-353,共7页
Journal of Donghua University(Natural Science)
基金
国家自然科学基金资助项目(51675095)
关键词
三维五向编织复合材料T型梁
低周弯曲疲劳
有限元分析
应力分布
失效模式
3-D five-directional braided T-shaped composite
low cycle bending fatigue
finite element analysis
stress distribution
failure mode
