Wang Qingtao, Wu Weili, Gong Zhili, Li Wei
College of Textiles, Donghua University, No. 2999, Northern Renmin Rd, Songjiang District, Shanghai 201620, China.
Shanghai Starriver Bilingual School, No. 2588, Jindu Street, Minhang District, Shanghai 201100, China.
Materials (Basel). 2018 Apr 17;11(4):619. doi: 10.3390/ma11040619.
The flexural progressive failure modes of carbon fiber and glass fiber (C/G) interlayer and intralayer hybrid composites were investigated in this work. Results showed that the bending failure modes for interlayer hybrid composites are determined by the layup structure. Besides, the bending failure is characterized by the compression failure of the upper layer, when carbon fiber tends to distribute in the upper layer, the interlayer hybrid composite fails early, the failure force is characterized by a multi-stage slightly fluctuating decline and the fracture area exhibits a diamond shape. While carbon fiber distributes in the middle or bottom layer, the failure time starts late, and the failure process exhibits one stage sharp force/stress drop, the fracture zone of glass fiber above the carbon layers presents an inverted trapezoid shape, while the fracture of glass fiber below the carbon layers exhibits an inverted triangular shape. With regards to the intralayer hybrid composites, the C/G hybrid ratio plays a dominating role in the bending failure which could be considered as the mixed failures of four structures. The bending failure of intralayer hybrid composites occurs in advance since carbon fiber are located in each layer; the failure process shows a multi-stage fluctuating decline, and the decline slows down as carbon fiber content increases, and the fracture sound release has the characteristics of a low intensity and high frequency for a long time. By contrast, as glass fiber content increases, the bending failure of intralayer composites is featured with a multi-stage cliff decline with a high amplitude and low frequency for a short-time fracture sound release.
本文研究了碳纤维与玻璃纤维（C/G）层间和层内混杂复合材料的弯曲渐进破坏模式。结果表明，层间混杂复合材料的弯曲破坏模式由铺层结构决定。此外，弯曲破坏以上层的压缩破坏为特征，当碳纤维倾向于分布在上层时，层间混杂复合材料较早失效，破坏力呈多阶段轻微波动下降，断裂区域呈菱形。当碳纤维分布在中间层或底层时，失效时间开始较晚，破坏过程呈现一个阶段的力/应力急剧下降，碳纤维层上方玻璃纤维的断裂区域呈倒梯形，而碳纤维层下方玻璃纤维的断裂呈现倒三角形。对于层内混杂复合材料，C/G混杂比在弯曲破坏中起主导作用，可视为四种结构的混合破坏。由于每层都有碳纤维，层内混杂复合材料的弯曲破坏提前发生；破坏过程呈现多阶段波动下降，随着碳纤维含量增加下降减缓，断裂声释放具有长时间低强度、高频的特点。相比之下，随着玻璃纤维含量增加，层内复合材料的弯曲破坏呈现多阶段悬崖式下降，具有高振幅、低频、短时间断裂声释放的特点。
