应力水平和纤维体积分数对玻璃纤维增强聚酯复合材料疲劳性能的影响。

Influence of Stress Level and Fibre Volume Fraction on Fatigue Performance of Glass Fibre-Reinforced Polyester Composites.

作者信息

Zaghloul Mahmoud Yousry, Zaghloul Moustafa Mahmoud Yousry, Zaghloul Mai Mahmoud Yousry

机构信息

Department of Accounting, Faculty of Commerce, Alexandria University, Alexandria 21554, Egypt.

Department of Mechanical Engineering, Faculty of Engineering, Alexandria University, Alexandria 21554, Egypt.

出版信息

Polymers (Basel). 2022 Jun 29;14(13):2662. doi: 10.3390/polym14132662.

DOI:10.3390/polym14132662

PMID:35808709

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9268926/

Abstract

Fibre-reinforced polymeric composite materials are becoming substantial and convenient materials in the repair and replacement of traditional metallic materials due to their high stiffness. The composites undergo different types of fatigue loads during their service life. The drive to enhance the design methodologies and predictive models of fibre-reinforced polymeric composite materials subjected to fatigue stresses is reliant on more precise and reliable techniques for assessing their fatigue life. The influences of fibre volume fraction and stress level on the fatigue performance of glass fibre-reinforced polyester (GFRP) composite materials have been studied in the tension-tension fatigue scenario. The fibre volume fractions for this investigation were set to: 20%, 35%, and 50%. The tensile testing of specimens was performed using a universal testing machine and the Young's modulus was validated with four different prediction models. In order to identify the modes of failure as well as the fatigue life of composites, polyester-based GFRP specimens were evaluated at five stress levels which were 75%, 65%, 50%, 40%, and 25% of the maximum tensile stress until either a fracture occurred or five million fatigue cycles was reached. The experimental results showed that glass fibre-reinforced polyester samples had a pure tension failure at high applied stress levels, while at low stress levels the failure mode was governed by stress levels. Finally, the experimental results of GFRP composite samples with different volume fractions were utilized for model validation and comparison, which showed that the proposed framework yields acceptable correlations of predicted fatigue lives in tension-tension fatigue regimes with experimental ones.

摘要

纤维增强聚合物复合材料因其高刚度，正成为修复和替代传统金属材料的重要且便利的材料。这些复合材料在其使用寿命期间会承受不同类型的疲劳载荷。增强承受疲劳应力的纤维增强聚合物复合材料的设计方法和预测模型，依赖于更精确和可靠的技术来评估其疲劳寿命。在拉伸 - 拉伸疲劳情况下，研究了纤维体积分数和应力水平对玻璃纤维增强聚酯（GFRP）复合材料疲劳性能的影响。本研究的纤维体积分数设定为：20%、35%和50%。使用万能试验机对试样进行拉伸试验，并用四种不同的预测模型验证杨氏模量。为了确定复合材料的失效模式以及疲劳寿命，对聚酯基GFRP试样在五个应力水平下进行评估，这些应力水平分别为最大拉伸应力的75%、65%、50%、40%和25%，直到发生断裂或达到五百万次疲劳循环。实验结果表明，玻璃纤维增强聚酯样品在高应力水平下发生纯拉伸失效，而在低应力水平下，失效模式受应力水平控制。最后，利用不同体积分数的GFRP复合材料样品的实验结果进行模型验证和比较，结果表明所提出的框架在拉伸 - 拉伸疲劳状态下预测的疲劳寿命与实验结果具有可接受的相关性。