An improved understanding of fatigue crack growth behavior of multiple collinear cracks in hybrid composite structures

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2025-04-23 DOI:10.1016/j.ijfatigue.2025.108997

Wandong Wang , Hongchen Zhao , Zhinan Zhang , Wenbo Sun , Calvin Rans , Yu’e Ma

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引用次数: 0

Abstract

Accurately predicting MSD crack growth behavior in hybrid metal–composite structures is challenging due to the complex interactions of fiber bridging and delamination failure in fiber–metal laminates (FMLs). These mechanisms enhance damage tolerance but complicate crack analysis. This paper proposes two analytical models to address crack growth in FMLs with multiple collinear cracks. The first model analyzes crack openings and stress intensity factors (SIFs) for multiple cracks, capturing the physics of MSD cracking, but it is cumbersome to implement. The second model simplifies the problem by considering energy dissipation, treating the MSD scenario as a single crack in a finite plate and equating the energy dissipation between both cases. Both models were validated and show accurate predictions of crack growth behavior, capturing crack acceleration effectively. The results emphasize the importance of accounting for the contributions of bridging and stiffening mechanisms in FMLs, particularly load redistribution, which influences crack growth.

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混杂复合材料结构中多重共线裂纹疲劳裂纹扩展行为的进一步认识

由于纤维-金属层压板（FMLs）中纤维桥接和分层破坏的复杂相互作用，准确预测混杂金属-复合材料结构中MSD裂纹扩展行为具有挑战性。这些机制提高了损伤容限，但使裂纹分析复杂化。本文提出了两种分析模型来解决具有多重共线裂纹的FMLs裂纹扩展问题。第一个模型分析了多个裂纹的裂纹开度和应力强度因子（SIFs），捕获了MSD裂纹的物理特性，但实现起来很麻烦。第二个模型通过考虑能量耗散来简化问题，将MSD情景视为有限板中的单个裂纹，并将两种情况之间的能量耗散等同起来。这两种模型都得到了验证，并能准确预测裂纹扩展行为，有效地捕捉裂纹加速度。结果强调了考虑桥接和加筋机制在FMLs中的贡献的重要性，特别是影响裂纹扩展的载荷再分配。

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.