两种典型铺层玻璃纤维复合材料的拉伸力学行为

Tension Mechanical Behavior of Two Angle-Ply of Glass-Fiber Reinforced Composites

利用电子万能实验机及分离式Hopkinson拉杆对玻璃纤维增强复合材料S4C9-1200/SY14的两种不同铺层角度层合板([0]16和[±45]4S)进行了应变率为10-3～103s-1下的单轴拉伸力学性能测试。从应力应变曲线和试样破坏断口分析了材料的应变率效应、纤维损伤和界面脱粘损伤。实验结果表明:[0]16层板破坏时表现出典型的不规则脆性破坏,纤维的损伤具有初始门槛值,而纤维的强化存在应变率门槛效应。[±45]4S层板主要破坏方式是纤维与基体的脱粘,损伤发展近似线性。应变率高于强化门槛时,[±45]4S层板表现出极强的应变率依赖性,极限强度能提高10%～50%。

Mechanical behavior of fiber reinforced composite （ S4C9-1200/SY14, with two angle-ply of [ 0 ] 16 and [ ±45 ] 4s） was investigated at strain rates ranging from 10 -3s-to 103s -1 under uniaxial tension/compression by using an electronic universal testing machine and the Split Hopkinson Tension Bar （ SHTB）. Damage modes of this laminated composite are further examined, which can be clarified into fiber brittle rupture and fiber/matrix debonding, as well as its dependence on strain rate are studied. The experimental resuits show that disheveled catastrophic brittle failure is observed for the [ 0 ] i6 specimens tested at quasi-static strain rates. For [ ＋ 45 ] 4s specimens, the failure mode is mainly fiber/matrix debonding, and the damage is linear with the stress. Significant strain rate sensitivity is found for [ ＋ 45 ] as specimens above strain rate value of the strengthen threshold.