Dynamic viscoelasticities of CF/GF hybrid reinforced epoxy composites under high load
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摘要: 采用高载动态热机械分析仪EPLEXOR500对T300/S-2混杂纤维增强环氧树脂复合材料的动态黏弹特性进行了分析, 考察了静态载荷、 动态载荷对其储能模量、 损耗模量和损耗角正切的影响, 并研究和对比了不同载荷水平下混杂比以及混杂方式对动态黏弹性参数的影响规律。结果表明: 不同混杂比复合材料的储能模量均随动态载荷的增大而降低, 随静态载荷的增大而增大, 损耗模量和损耗角正切则随两种载荷的增大而降低。高载荷下混杂复合材料的储能模量仍较好地符合"复合梁理论"。动载扫描模式下, 损耗角正切随混杂比的变化基本符合"混合定律", 夹芯混杂复合材料的储能模量远高于层间混杂复合材料, 且损耗角正切也比层间混杂时大; 但在静载扫描模式下则是层间混杂复合材料的损耗角正切更大。Abstract: The EPLEXOR 500 was used to investigate the dynamic viscoelasticities of T300/S-2 hybrid reinforced epoxy composites. The effects of the static load and dynamic load on the storage modulus, loss modulus and loss tangent of hybrid composites were studied. The effects of hybrid ratios and hybrid modes on dynamic viscoelasticities under different load levels were discussed and compared. The results show that the storage modulus of the composites with different hybrid ratios uniformly decreases with the increase of dynamic load and increases with the increase of static load. The loss modulus and loss tangent both decrease with the increase of the static or dynamic loads. The storage modulus of the hybrid composites under high load approximately conforms to the Composite Beam Theory. In the dynamic load sweep mode, the variation of loss tangent with the volume fraction of carbon fiber can still be described by the Mixture Rule, and the storage modulus of sandwich hybrid composites is much higher than that of interlaminar hybrid composites. In such sweep mode the loss tangent of sandwich hybrid compo-sites is also larger than that of interlaminar hybrid composites, but in the static load sweep mode, the case is reverse.
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