Tensile-strength-controlling factors in unidirectional carbon fiber reinforced plastic composites
Tensile-strength-controlling factors in unidirectional carbon fiber reinforced plastic composites
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DOI：
10.1016/j.compositesa.2020.106140
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发表时间：
2021
影响因子：
8.7
通讯作者：
G. Yamamoto;K. Koizumi;Takahiro Nakamura;N. Hirano;T. Okabe
中科院分区：
文献类型：
--
作者：
G. Yamamoto;K. Koizumi;Takahiro Nakamura;N. Hirano;T. Okabe
通过对环氧树脂基体力学性能的研究，对影响单向碳纤维增强塑料（CFRP）复合材料拉伸强度的因素进行了实验研究。进行相关性分析，以揭示基体的机械特性，影响在相邻的纤维中的断裂位点引起的完整的纤维的表面应力集中。应力集中系数（SCF）进行了评估，通过实施双纤维断裂试验结合弹簧元模型模拟。通过对六种环氧材料的研究，观察到基体裂纹尖端张开位移（CTOD）与临界应力之间存在合理的相关性;临界应力随着CTOD的增加而近似线性增加。这里报道的结果表明，CTOD是一个重要的拉伸强度控制因素，考虑更强的CFRP复合材料的发展。
Factors governing the tensile strength of unidirectional carbon fiber reinforced plastic (CFRP) composites were experimentally investigated by focusing on the mechanical characteristics of the epoxy matrix. Correlation analysis was conducted to reveal the mechanical characteristics of the matrix that affect the surface stress concentration of an intact fiber caused by a fracture site in an adjacent fiber. The stress concentration factors (SCFs) were evaluated by implementing double-fiber fragmentation tests in conjunction with spring element model simulations. From investigating six types of epoxy materials, a reasonable correlation was observed between the matrix crack tip opening displacement (CTOD) and the SCF; the SCF increased approximately linearly with increasing CTOD. The results reported here suggest that CTOD is one of the important tensile-strength-controlling factors to consider for the development of stronger CFRP composites.