Study on fatigue crack growth behavior of Al 6061-T6 alloy with inclined crack

IF 2.5 3区工程技术 Q2 MECHANICS

Archive of Applied Mechanics Pub Date : 2025-07-09 DOI:10.1007/s00419-025-02866-9

Ruoping Zhang, Yongfang Li, Hao Chen, Yali Yang, Sha Xu, Mingming Ren, Shusheng Lv

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引用次数: 0

Abstract

The fatigue crack growth behavior of Al 6061-T6 alloy with inclined cracks is studied through theoretical derivation, numerical simulation, and experimental verification. A modified fatigue crack growth model taking into account of crack closure effect under mixed-mode I and II loading condition based on Paris equation is analyzed theoretically. Initial cracks with different inclination angles (β = 0°, 30°, and 60°) are prefabricated on Al 6061-T6 alloy plates with the thickness of 10 mm. The fatigue crack propagation process of the alloy is investigated by experiment and finite element simulation. The results indicate that the crack propagation path of the specimen with inclined cracks is generally consistent with the direction perpendicular to the cyclic loading during the crack growth process. Crack propagation mainly includes two stages: initial propagation and stable propagation. The initial crack propagation is closely related to the inclination angle β. The larger the angle β is set, the slower the initial crack propagation rate becomes. During the stable propagation stage, the crack has completely transformed from a mixed mode I and II to a pure mode I. The propagation rate of the entire crack front is consistent, and the shape of the crack front is also similar.

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倾斜裂纹Al 6061-T6合金疲劳裂纹扩展行为研究

通过理论推导、数值模拟和实验验证，研究了Al 6061-T6合金倾斜裂纹的疲劳裂纹扩展行为。从理论上分析了基于Paris方程的考虑I、II混合加载条件下裂纹闭合效应的修正疲劳裂纹扩展模型。在厚度为10 mm的Al 6061-T6合金板上预制了不同倾角（β = 0°、30°和60°）的初始裂纹。采用实验和有限元模拟相结合的方法研究了该合金的疲劳裂纹扩展过程。结果表明：在裂纹扩展过程中，倾斜裂纹试件的裂纹扩展路径与与循环加载方向垂直的方向基本一致；裂纹扩展主要包括初始扩展和稳定扩展两个阶段。初始裂纹扩展与倾角β密切相关。角β越大，初始裂纹扩展速率越慢。在稳定扩展阶段，裂纹已完全由I和II混合模式转变为纯粹I模式，整个裂纹前缘的扩展速率一致，裂纹前缘形状也相似。

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来源期刊

Archive of Applied Mechanics 物理-力学

CiteScore

4.40

自引率

10.70%

发文量

234

审稿时长

4-8 weeks

期刊介绍： Archive of Applied Mechanics serves as a platform to communicate original research of scholarly value in all branches of theoretical and applied mechanics, i.e., in solid and fluid mechanics, dynamics and vibrations. It focuses on continuum mechanics in general, structural mechanics, biomechanics, micro- and nano-mechanics as well as hydrodynamics. In particular, the following topics are emphasised: thermodynamics of materials, material modeling, multi-physics, mechanical properties of materials, homogenisation, phase transitions, fracture and damage mechanics, vibration, wave propagation experimental mechanics as well as machine learning techniques in the context of applied mechanics.