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首页> 外文期刊>The Journal of the Textile Institute >Effect of pre-crack length on Mode I fracture toughness of 3-D angle-interlock woven composites from finite element analyses
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Effect of pre-crack length on Mode I fracture toughness of 3-D angle-interlock woven composites from finite element analyses

机译：裂纹前长度对3-D角互锁编织复合材料I型断裂韧性的有限元分析

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摘要

Fracture toughness is a key factor to design impact behaviors of composite materials. This paper reports the influence of pre-crack length on Mode I fracture toughness of 3-D angle-interlock woven composites. Double cantilever beam specimens with different pre-crack lengths were tested to obtain load-displacement curves and strain energy release rates. A finite element analysis model at microstructure level was established to reveal the fracture damage development and stress distribution in the specimens. We found that the fracture toughness decreases with increase in pre-crack length. The higher pre-crack length resulted in increased stress concentration at crack tip position and the enhanced crack propagation. The higher strength through-thickness yarns are recommended for improving fracture toughness.
机译：断裂韧性是设计复合材料冲击性能的关键因素。本文报道了裂纹前长度对3-D角互锁编织复合材料的I型断裂韧性的影响。测试了具有不同裂纹前长度的双悬臂梁试样，以获得载荷-位移曲线和应变能释放率。建立了微观结构水平的有限元分析模型，以揭示样品中的断裂损伤发展和应力分布。我们发现，断裂韧性随着裂纹前长度的增加而降低。较长的裂纹前长度导致裂纹尖端位置处的应力集中增加，并且裂纹扩展性增强。建议使用较高强度的全厚度纱线以提高断裂韧性。

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