Ultrasonic fully reversed axial tests for exploring the very high cycle fatigue of composite materials

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2024-10-16 DOI:10.1016/j.ijfatigue.2024.108653

C. Boursier Niutta, A. Tridello, D.S. Paolino

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Abstract

In the present work, the feasibility of axial ultrasonic tests for exploring the fully reversed fatigue response of composite materials even in the Very High Cycle Fatigue (VHCF) regime is proved. VHCF tests are run on hourglass specimens made of twill 2x2 carbon woven fabric impregnated with epoxy resin with stacking sequences [0]₈ and [0/90/+45/-45]_s and designed through Finite Element (FE) modal analysis. The stress distribution within the specimen and the absence of buckling are first determined through an extensive strain gage campaign, which has validated the FE model. As the temperature is a main concern in ultrasonic tests, the temperature increment within the composite specimen is investigated by means of an embedded fiber optic sensor and controlled during the tests with an infrared sensor. With the proposed experimental setup, fully reversed ultrasonic tests have been carried out up to 10⁹ cycles and the failure of the two investigated specimen types has been analyzed by comparing the failure origin location in relation to the stress distributions.

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用于探索复合材料超高循环疲劳的超声波全反向轴向试验

在本研究中，轴向超声波试验用于探索复合材料在极高循环疲劳（VHCF）状态下的完全反向疲劳响应的可行性得到了证实。VHCF 试验在沙漏试样上进行，试样由浸渍环氧树脂的斜纹 2x2 碳纤维编织物制成，堆叠序列为 [0]8 和 [0/90/+45/-45]s，试样是通过有限元（FE）模态分析设计的。首先通过广泛的应变测量活动确定了试样内部的应力分布和无屈曲情况，从而验证了有限元模型。由于温度是超声波测试中的主要问题，因此通过嵌入式光纤传感器对复合材料试样内的温度增量进行了研究，并在测试过程中使用红外传感器进行控制。利用所提出的实验装置，进行了多达 109 个循环的完全反向超声波试验，并通过比较与应力分布相关的失效起源位置，分析了所研究的两种试样类型的失效情况。

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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.