Fiber break evolution and fatigue life prediction of CFRP with random fiber distribution

Zhu Fulei; Zhang Shufeng; Yu Dianlong; Huang Fangchao

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Fiber break evolution and fatigue life prediction of CFRP with random fiber distribution

机译：随机纤维分布CFRP的纤维断裂演化与疲劳寿命预测

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摘要

A new method on fatigue life prediction of unidirectional (UD) carbon fiber reinforced plastic (CFRP) is proposed based on fatigue characteristic of single fiber and expansion of broken fiber clusters. Both of statistical fatigue strength of single fiber and non-uniform fiber distribution are considered to assess the fiber break evolution characteristic and the fatigue life of CFRP. A stress redistribution coefficient (SRC) model is proposed to calculate the magnitude of stress overload in intact fibres after nearby fibre break. The SRC depends on not only the distance between broken and intact fibers but also the number of fibers adjacent to the broken fiber. A flowchart is established to predict fatigue life of UD CFRP based on the proposed SRC model. The proposed SRC model predicts clear defection point on the curve of fiber breaking number and stiffness degradation as increase of loading cycles, which agrees well with experimental phenomena in available literatures.

机译：提出了一种新的单向（UD）碳纤维增强塑料（CFRP）的疲劳寿命预测方法，基于单纤维的疲劳特性和破碎的纤维簇的膨胀。考虑单纤维和非均匀纤维分布的统计疲劳强度的两种统计疲劳强度评估CFRP的纤维断裂蒸变特征和疲劳寿命。提出了一种应力再分布系数（SRC）模型来计算附近纤维断裂后完整纤维的应力过载量的大小。 SRC不仅取决于破碎和完整纤维之间的距离，还取决于与破碎纤维相邻的纤维数。建立流程图以预测基于所提出的SRC模型来预测UD CFRP的疲劳寿命。所提出的SRC模型预测纤维断裂数和刚度降解曲线上的明显缺陷点作为装载循环的增加，这与可用文献中的实验现象相当良好。

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来源
《Composite Structures》 |2021年第3期|113475.1-113475.9|共9页
作者
Zhu Fulei; Zhang Shufeng; Yu Dianlong; Huang Fangchao;
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作者单位

Natl Univ Def Technol Coll Intelligence Sci & Technol Lab Sci & Technol Integrated Logist Support Changsha 410073 Peoples R China;

Natl Univ Def Technol Coll Intelligence Sci & Technol Lab Sci & Technol Integrated Logist Support Changsha 410073 Peoples R China;

Natl Univ Def Technol Coll Intelligence Sci & Technol Lab Sci & Technol Integrated Logist Support Changsha 410073 Peoples R China;

Natl Univ Def Technol Coll Intelligence Sci & Technol Lab Sci & Technol Integrated Logist Support Changsha 410073 Peoples R China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类
关键词
UD composite; Fatigue life prediction; Fiber break evolution; SRC model;

机译：UD复合;疲劳寿命预测;纤维突破演化;SRC模型;

Fiber break evolution and fatigue life prediction of CFRP with random fiber distribution

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