Mode I fatigue delamination growth behavior and model for multidirectional laminates with the same overall stiffness

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2024-11-05 DOI:10.1016/j.ijfatigue.2024.108697

Luohuan Zou , Yu Gong , Dingli Tian , Sizhuo Hao , Jianyu Zhang , Libin Zhao , Ning Hu

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Abstract

In order to isolate the influence of ply orientation on the mode I fatigue delamination propagation behavior of carbon fiber reinforced composite laminates, multidirectional laminates with the same overall stiffness are designed while three different interfaces (0//0, 45//45, and 90//90), which can avoid the coupling effect of remote plies. Test results show that the fatigue delamination behavior is obviously affected by the interface angle. In addition, a novel and simple method for determining the fatigue delamination resistance is proposed. The measured fatigue delamination resistance is lower than the quasi-static one for all interfaces. The specimen with 45//45 interface exhibits more significant delamination resistance, whereas the delamination resistances of specimens with 0/0 and 90//90 interfaces are similar, which is consistent with the phenomenon of more bridging fibers accompanying in the delamination process of 45//45 interface. In order to consider the effect of fiber bridging and reduce the dispersion of the data, experimental data are further processed using a normalized model considering the effect of fiber bridging. The normalized results can be characterized by a single curve, suggesting that the normalized model is effective in describing the fatigue delamination behavior in the presence of fiber bridging.

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具有相同整体刚度的多向层压板的模式 I 疲劳分层增长行为和模型

为了隔离层间取向对碳纤维增强复合材料层压板模态 I 疲劳分层扩展行为的影响，设计了具有相同整体刚度的多向层压板，同时设计了三种不同的界面（0//0、45//45 和 90/90），以避免偏远层间的耦合效应。试验结果表明，疲劳分层行为明显受到界面角度的影响。此外，还提出了一种新颖而简单的疲劳分层电阻测定方法。对于所有界面，测得的疲劳分层阻力都低于准静态阻力。具有 45/45 接口的试样表现出更明显的分层阻力，而具有 0/0 和 90/90 接口的试样的分层阻力相近，这与 45/45 接口的分层过程中伴随着更多桥接纤维的现象一致。为了考虑纤维架桥的影响并减少数据的离散性，使用考虑纤维架桥影响的归一化模型对实验数据进行了进一步处理。归一化结果可以用一条曲线表征，这表明归一化模型可以有效地描述存在纤维架桥时的疲劳分层行为。

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

International Journal of Fatigue 工程技术-材料科学：综合

CiteScore

10.70

自引率

21.70%

发文量

619

审稿时长

58 days

期刊介绍： Typical subjects discussed in International Journal of Fatigue address: Novel fatigue testing and characterization methods (new kinds of fatigue tests, critical evaluation of existing methods, in situ measurement of fatigue degradation, non-contact field measurements) Multiaxial fatigue and complex loading effects of materials and structures, exploring state-of-the-art concepts in degradation under cyclic loading Fatigue in the very high cycle regime, including failure mode transitions from surface to subsurface, effects of surface treatment, processing, and loading conditions Modeling (including degradation processes and related driving forces, multiscale/multi-resolution methods, computational hierarchical and concurrent methods for coupled component and material responses, novel methods for notch root analysis, fracture mechanics, damage mechanics, crack growth kinetics, life prediction and durability, and prediction of stochastic fatigue behavior reflecting microstructure and service conditions) Models for early stages of fatigue crack formation and growth that explicitly consider microstructure and relevant materials science aspects Understanding the influence or manufacturing and processing route on fatigue degradation, and embedding this understanding in more predictive schemes for mitigation and design against fatigue Prognosis and damage state awareness (including sensors, monitoring, methodology, interactive control, accelerated methods, data interpretation) Applications of technologies associated with fatigue and their implications for structural integrity and reliability. This includes issues related to design, operation and maintenance, i.e., life cycle engineering Smart materials and structures that can sense and mitigate fatigue degradation Fatigue of devices and structures at small scales, including effects of process route and surfaces/interfaces.