Influence of polymer properties and fiber–matrix interface on the kink band initiation in compression-compression fatigue loading of continuous fiber reinforced plastics

IF 6.8 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2025-07-24 DOI:10.1016/j.ijfatigue.2025.109191

Andreas Baumann, Joachim Hausmann

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Abstract

Continuous fiber reinforced laminates have been investigated in much detail for their quasi-static compressive failure behavior. Numerous failure modes like fiber buckling, kink banding, delaminations and splitting are described. Kink band formation takes on a special role because this failure mode is dependent on the properties of the matrix polymer. Not many experimental results can be found on the failure modes active in compression-compression (C–C) fatigue loading of these materials. This investigation addresses for the first time the influence of the polymer properties on the C–C failure laminates with unidirectional glass- and carbon fiber reinforcement. With the aim of broadly altering the polymer properties γ radiation of a Co-60 source is used as a final specimen preparation step for an epoxy system and polycarbonate. In addition, time dependent effects are investigated by comparing quasi-static loading to two different load signals (sinusoidal and trapezoidal stress-time signal). Notched specimens are used to target kink band formation exclusively. By additional fatigue tests in in-plane shear loading and quasi-static interlaminar shear tests, it was found that the interplay between the matrix-polymer and the fiber–matrix interface could drastically alter the resulting fatigue performance of a laminate.

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聚合物性能和纤维-基体界面对连续纤维增强塑料压缩-压缩疲劳载荷中扭结带萌生的影响

对连续纤维增强层合板的准静态压缩破坏行为进行了较为详细的研究。描述了多种失效模式，如纤维屈曲、扭结带、分层和劈裂。扭结带的形成起着特殊的作用，因为这种失效模式取决于基体聚合物的性质。这些材料在压缩-压缩（C-C）疲劳载荷下的破坏模式的试验结果并不多见。本研究首次探讨了聚合物性能对单向玻纤和碳纤维增强C-C层合板破坏的影响。为了广泛地改变聚合物的性质，Co-60源的γ辐射被用作环氧体系和聚碳酸酯的最后试样制备步骤。此外，通过比较准静态载荷对两种不同载荷信号（正弦和梯形应力-时间信号）的影响，研究了时间依赖性效应。缺口标本用于专门针对扭结带形成。通过面内剪切加载和准静态层间剪切附加疲劳试验，发现基体-聚合物和纤维-基体界面之间的相互作用会极大地改变层合板的疲劳性能。

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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.