三向编织玻璃/环氧复合材料刚度性能

Stiffness properties of triaxially braided glass/epoxy composites

通过实验研究了三向编织玻璃/环氧复合材料的刚度性能,并考虑编织角和试件宽度参数的影响,探讨了拉伸和压缩刚度性能的差异。实验结果表明:在同一纤维体积分数条件下,随着编织角的增大,试件的纵向弹性模量有所减小,泊松比(在编织角约大于35°时)也有所减小;宽度为两倍和三倍单胞宽度的试件的刚度性能基本相同;试件的纵向弹性模量和泊松比远大于横向弹性模量和泊松比;拉伸和压缩时试件的弹性模量和泊松比基本接近;在横向拉伸和压缩时试件的应力-应变曲线具有明显的非线性特征。实验结果为编织复合材料结构设计提供了数据参考。

The stiffness properties of triaxially braided glass/epoxy composites, considering the effect of braid angle and specimen width, were tested. The differences between tensile and compressive stiffness properties were also discussed. The test results show that the longitudinal modulus of the specimens decreases a little with the increasing braid angle in the same fiber volume fraction, and so dose the Poisson＇s ratio （when the braid angle is approximately greater than 35 degree）. As the specimen width changes from double to threefold the unit cell width, the stiffness properties of the specimen are almost equal. The longitudinal modulus and Poisson＇s ratio are much greater than the transverse modulus and Poisson＇s ratio. Furthermore, tensile specimens almost equal compressive specimens in modulus and Poisson＇s ratio. It is found that the transverse tension and compression stress - strain curves are highly nonlinear. The test results can provide a reference for the braided composite structure design.