拉挤工艺单向玻纤复合材料的疲劳衰减特性

何家鹏, 张津毓, 陈章兴, 等

doi:10.12141/j.issn.1000-565X.220760

华南理工大学学报(自然科学版) >

2024 , Vol. 52 >Issue 1: 62 - 71

DOI: https://doi.org/10.12141/j.issn.1000-565X.220760

结构疲劳与损伤

拉挤工艺单向玻纤复合材料的疲劳衰减特性

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^1.上海交通大学机械与动力工程学院，上海 200240
^2.江苏神马电力股份有限公司国家能源电力绝缘复合材料重点实验室，江苏南通 226553
^3.清华大学航天航空学院，北京 100084
^4.中国长江电力股份有限公司三峡梯调昆明调控部，云南昆明 650000
^5.上海交通大学船舶海洋与建筑工程学院，上海 200240

何家鹏（2000-），男，博士生，主要从事轻量化材料建模研究。E-mail:hejiapeng@sjtu.edu.cn

收稿日期: 2022-11-17

网络出版日期: 2023-06-20

基金资助

江苏省卓越博士后计划项目(2022ZB893)

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Mechanical Properties Degradation Under Fatigue Loading in Pultruded Unidirectional Glass Fiber Reinforced Polymer Composites

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^1.School of Mechanical and Engineering，Shanghai Jiao Tong University，Shanghai 200240，China
^2.Key Laboratory of Composite Materials on Electrical Insulation，National Energy Administration，Jiangsu Shemar Electric Co. ，Ltd. ，Nantong 226553，Jiangsu，China
^3.School of Aerospace Engineering，Tsinghua University，Beijing 100084，China
^4.Three Gorges Cascade Dispatch Kunming Control Department，China Yangtze Power Co. ，Ltd. ，Kunming 650000，Yunnan，China
^5.School of Naval Architecture，Ocean and Civil Engineering，Shanghai Jiao Tong University，Shanghai 200240，China

何家鹏（2000-），男，博士生，主要从事轻量化材料建模研究。E-mail:hejiapeng@sjtu.edu.cn

Received date: 2022-11-17

Online published: 2023-06-20

Supported by

the Jiangsu Superior Postdoc Plan(2022ZB893)

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摘要

拉挤工艺制备的玻璃纤维增强复合材料（GFRP）由于其良好的电气、力学性能被广泛运用于特高压输电工程，其中动态载荷作用下的性质研究是其应用的基础。文中通过开展沿纤维方向的静载实验和疲劳实验，建立了基于S-N曲线和分段线性等寿命图的疲劳寿命预测方法；根据不同应力比下刚度退化规律，提出了基于改进三角函数形式的损伤累积模型，准确描述了拉-拉和拉-压疲劳载荷下的材料非线性刚度退化规律；建立了剩余刚度-剩余强度关联模型，实现了疲劳载荷下强度性能衰减的准确预测。结果表明，GFRP在拉-拉和拉-压疲劳下具有显著不同的刚度退化规律，文中所提出的模型可准确预测两种条件下的剩余强度；而压-压疲劳载荷下，刚度退化曲线存在两种显著不同的模式；同时，剩余强度结果表明，前70%疲劳寿命内材料强度可能并不会发生明显退化。文中建立的针对拉挤GFRP在不同疲劳加载下剩余强度与剩余刚度的预测模型，为GFRP耐久性设计提供了指导。

关键词： 玻璃纤维增强复合材料; S-N曲线; 等寿命图; 疲劳寿命预测; 刚度退化; 剩余强度预测

本文引用格式

何家鹏, 张津毓, 陈章兴, 等 . 拉挤工艺单向玻纤复合材料的疲劳衰减特性[J]. 华南理工大学学报(自然科学版), 2024 , 52(1) : 62 -71 . DOI: 10.12141/j.issn.1000-565X.220760

Abstract

Pultruded glass fiber reinforced polymer (GFRP) composites are extensively applied in the field of ultra-high voltage power transmission due to their excellent electrical and mechanical properties, and the design considering its performance degradation characteristics under fatigue loading is the key to the application. This study carried out static load tests and fatigue tests under different conditions with the pultruded unidirectional GFRP. A fatigue life prediction model was established based on a piecewise linear constant life diagram determined by S-N curves. According to the stiffness degradation law under different stress ratios, a modified damage accumulation model based on the improved trigonometric function was presented to describe the nonlinear stiffness degradation process under both tension-tension and tension-compression fatigue loads. The correlation model between residual strength and residual stiffness was established to predict the strength degradation precisely. The results show that the stiffness degradation processes of GFRP under tension-tension and tension-compression fatigue loads are significantly different. The model proposed in the paper can accurately predict the residual strength under the two conditions. Under compression-compression fatigue load, there are two different patterns for the stiffness degradation processes, and the residual strength test shows that the strength within the first 70% fatigue life does not exhibit a significant degradation.The prediction model for the residual strength and residual stiffness of GFRP under different fatigue loading provides a guide for the durability design of GFRP.

Key words： glass fiber reinforced polymer （GFRP）; S-N curve; constant life diagram; fatigue life prediction; stiffness degradation; residual strength prediction

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