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首页> 外文期刊>Materials Science and Engineering >Longitudinal compressive behavior and failure mechanism of three-dimensional five-directional carbon/phenolic braided composites at high strain rates
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Longitudinal compressive behavior and failure mechanism of three-dimensional five-directional carbon/phenolic braided composites at high strain rates

机译：高应变速率下三维五向碳/酚醛编织复合材料的纵向压缩行为和破坏机理

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摘要

The uniaxial compressive stress-strain response of three-dimensional (3D) five-directional carbon/phenolic braided composites are experimentally investigated at high strain rates from 350 to 1600 s~(-1) using the split Hopkinson pressure bar technique. The compressive loads are applied in a longitudinal direction (along the braiding direction). The macro- and micro-fracture morphology examinations are conducted using a scanning electron microscope (SEM) to understand the deformation and dynamic failure mechanism. The results show that the dynamic stress vs. strain curves exhibit a linear response followed by a load-drop at the on-set of matrix failure. The composites clearly demonstrate the strain rate strengthening effects and dynamic toughness phenomenon. The fracture morphology of the composites is varied under different loading rates. The damage is in the form of matrix cracking yielding and falling off, the interface debonding, and the migration, local buckling and shear fracture of the fibers. In addition, the ideal aspect ratio for the composites under dynamic compression is in the range of 0.75-1.25.
机译：利用分裂霍普金森压力棒技术，在350至1600 s〜（-1）的高应变速率下，通过实验研究了三维（3D）五向碳/酚醛编织复合材料的单轴压缩应力-应变响应。压缩载荷沿纵向（沿编织方向）施加。使用扫描电子显微镜（SEM）进行宏观和微观断裂形态检查，以了解变形和动态破坏机理。结果表明，动应力-应变曲线表现出线性响应，随后在基质破坏开始时出现了载荷下降。该复合材料清楚地显示出应变速率增强作用和动态韧性现象。复合材料的断裂形态在不同的加载速率下变化。破坏的形式是基体开裂和脱落，界面脱粘以及纤维的迁移，局部屈曲和剪切断裂。另外，复合材料在动态压缩下的理想纵横比在0.75-1.25的范围内。

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