An experimental investigation of fatigue performance and damage distribution mechanism in Bi-Directional GFRP composites

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2024-11-28 DOI:10.1016/j.ijfatigue.2024.108735

Ateeb Ahmad Khan, Indra Vir Singh, Bhanu Kumar Mishra, Ramadas Chennamsetti

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Abstract

This study presents an experimental investigation of the fatigue performance and damage distribution mechanism of bi-directional GFRP composites. Uniaxial fatigue tests have been conducted under load-control, at stress ratios, R = 0.1, 0.5 and critical stress ratio (χ=-0.9). The influence of gauge length and surface roughness on fatigue life has been examined for R = 0.1. An infrared (IR) camera is employed to monitor temperature evolution and capture thermal images during the fatigue experiments. Fatigue stiffness degradation, energy dissipated per cycle, and severity of damage progression have been analyzed to elucidate the effects of stress levels and mean stress on fatigue performance. At higher stress levels, the damage is intense and localized, resulting in relatively shorter life due to fiber-breakage accompanied by rapid fatigue stiffness degradation. At lower stress levels, the damage is uniformly distributed and less severe, primarily involves stress concentration, resulting in longer fatigue lives. The study highlights the contrasting damage progression mechanisms for tension–tension and tension–compression fatigue. Under tension–tension fatigue, an oval-shaped damage zone forms perpendicular to the loading direction indicating transverse crack propagation, while under tension–compression fatigue, the damage zone aligns parallel to the loading direction indicating longitudinal crack propagation due to compressive loading.

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双向GFRP复合材料疲劳性能及损伤分布机理的试验研究

对双向GFRP复合材料的疲劳性能和损伤分布机理进行了试验研究。在载荷控制下，在应力比R = 0.1、0.5和临界应力比（χ=-0.9）下进行了单轴疲劳试验。在R = 0.1的条件下，考察了规长和表面粗糙度对疲劳寿命的影响。采用红外摄像机监测疲劳试验过程中的温度变化，并采集热图像。为了阐明应力水平和平均应力对疲劳性能的影响，对疲劳刚度退化、每循环能量耗散和损伤进展的严重程度进行了分析。在较高的应力水平下，损伤是强烈的和局部的，由于纤维断裂伴随着快速的疲劳刚度退化，导致相对较短的寿命。在较低的应力水平下，损伤分布均匀，损伤程度较轻，主要是应力集中，从而延长了疲劳寿命。该研究强调了拉伸-拉伸和拉伸-压缩疲劳损伤进展机制的对比。在拉伸-拉伸疲劳下，垂直于加载方向形成椭圆形的损伤区，表示横向裂纹扩展；在拉伸-压缩疲劳下，损伤区平行于加载方向，表示纵向裂纹扩展。

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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.