Size Effects and Hygrothermal Aging on Mode II Interlaminar Fracture Toughness of Thick CFRP Composites

IF 3.1 2区材料科学 Q2 ENGINEERING, MECHANICAL

Fatigue & Fracture of Engineering Materials & Structures Pub Date : 2025-05-22 DOI:10.1111/ffe.14690

Yan Gao, Yanquan Zhou, Zequn Lin, Chenxing Gong, Zihan Ling

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Abstract

The size effects and hygrothermal aging behavior of Mode II interlaminar fracture toughness (G_IIc) for thick composites are investigated. Experimental results demonstrate that increasing specimen thickness leads to a rise in G_IIc for NPC and PC tests from 0.99 and 0.64 kJ/m² to 1.41 and 0.97 kJ/m², respectively. FE simulation results indicate that the increase in the fracture process zone (FPZ) area plays a crucial role in contributing to the size effects observed in G_IIc. The ENF specimens exhibit a significant decrease in glass transition temperature (T_g) along with noticeable changes in fracture morphology. The G_IIc values obtained from NPC tests are significantly lower than those of unaged specimens. However, hygrothermal aging has no effect on the crack propagation behavior and G_IIc values in PC tests. These findings provide practical insights for designing and predicting the service life of composite components exposed to humid and high-temperature environments.

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尺寸效应和湿热老化对厚CFRP复合材料II型层间断裂韧性的影响

研究了厚复合材料II型层间断裂韧性（GIIc）的尺寸效应和湿热老化行为。实验结果表明，随着试件厚度的增加，NPC和PC试验的GIIc分别从0.99和0.64 kJ/m2增加到1.41和0.97 kJ/m2。有限元模拟结果表明，断裂过程区（FPZ）面积的增加对GIIc中观察到的尺寸效应起着至关重要的作用。ENF试样的玻璃化转变温度（Tg）显著降低，断口形貌发生明显变化。NPC试验获得的GIIc值明显低于未老化标本。然而，湿热时效对裂纹扩展行为和PC试验中的GIIc值没有影响。这些发现为设计和预测暴露在潮湿和高温环境下的复合材料部件的使用寿命提供了实用的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Fatigue & Fracture of Engineering Materials & Structures 工程技术-材料科学：综合

CiteScore

6.30

自引率

18.90%

发文量

256

审稿时长

4 months

期刊介绍： Fatigue & Fracture of Engineering Materials & Structures (FFEMS) encompasses the broad topic of structural integrity which is founded on the mechanics of fatigue and fracture, and is concerned with the reliability and effectiveness of various materials and structural components of any scale or geometry. The editors publish original contributions that will stimulate the intellectual innovation that generates elegant, effective and economic engineering designs. The journal is interdisciplinary and includes papers from scientists and engineers in the fields of materials science, mechanics, physics, chemistry, etc.