界面强度对玻璃纤维增强不饱和聚酯复合材料静态和动态力学性能影响

Effects of Interface Strength on Static and Dynamic Mechanical Properties of Glass Fiber Reinforced Unsaturated Polyester Composites

采用3种高强高模玻璃纤维与不饱和树脂,分别制备了3种单向板复合材料和3种织物复合材料,通过纤维束拔出法和韦布分析法表征了3种玻璃纤维与不饱和树脂间的界面结合强度,并研究了界面强度与复合材料静态和动态力学性能。结果表明:3种纤维的本征界面强度分别为27.12,34.91,35.60MPa;界面强度对复合材料静态力学与疲劳性能有着重要的影响,但对模量的影响较小。随着界面强度的增加,90°方向的拉伸强度逐渐增加,但是0°方向上的拉伸强度反而下降。当疲劳应变较低时,界面强度的增加有助于疲劳性能的提高;但当疲劳应变提高时,界面强度对疲劳性能的影响降低,与材料初始强度反而有着明显的相关性。

Three kinds of unidirectional composites plates and three kinds of fabric composites were prepared from three kinds of high-strength and high-modulus glass fibers and unsaturated polyester resin.The interface strength of the three glass fibers and unsaturated polyester resin were characterized by fiber pull-out method and Webb analysis,and the static and dynamic mechanical properties of the composites were investigated.The results showed that the intrinsic interface strength of the three fibers was 27.12,34.91 and 35.60 MPa respectively.The interface strength had an important influence on the static mechanical properties and fatigue properties of the composites,but had little effect on the modulus.As the interface strength increased,the tensile strength in 90°direction gradually increased,but the tensile strength in 0°direction decreased.When the fatigue strain was low,the increase of the interface strength contributed to the improvement of the fatigue behaviour.However,when the fatigue strain increased,the influence of the interface strength on the fatigue behaviour decreased,and there was a clear correlation with the initial strength of the material.