Investigation into Corrosion Pit-to-Fatigue Crack Transition in 7075-T6 Aluminum Alloy

Sabelkin, V.; Mall, S.; Misak, Heath Edward

doi:10.1007/s11665-017-2697-4

Cited by 7 publications

(2 citation statements)

References 15 publications

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“…Therefore, the fatigue properties of aluminum alloy were studied by scientific researchers. In order to approximate the actual service conditions, fatigue tests were designed to be different strain ratios, corrosion environment conditions and so on [12][13][14][15] . Sreenivasan et al [16] have investigated the role of accumulation of ratcheting strain on low cycle fatigue behavior of aluminum 7075-T6 alloy, the results indicated that ratcheting strain was detrimental to fatigue life of aluminum 7075-T6 alloy by comparing the low cycle fatigue behavior of the investigated alloy with and without ratcheting indicated.…”

Section: Intrductionmentioning

confidence: 99%

Low-cycle fatigue behavior of extruded Al-7Zn-2Mg-1.5Cu-0.2Sc-0.1Zr alloy at room and low temperatures

Zhu

Chen

et al. 2018

MATEC Web Conf.

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Due to the low density and high specific strength, aluminum alloys have been considered for automotive and aerospace applications. The aluminum components usually service in the conditions of low temperature and dynamic loading. Therefore, the research on the low temperature fatigue performances of Al alloys has great significance. The lowcycle fatigue tests for the extruded Al-7Zn-2Mg-1.5Cu-0.2Sc-0.1Zr alloy subjected to solution plus aging treatment have been conducted at 25°C and -40°C, respectively. The strain ratio and cyclic frequency applied in the low-cycle fatigue test were -1 and 0.5Hz, respectively. The experimental results show that at 25°C, the alloy exhibits the cyclic hardening at the total strain amplitudes of 1.0% and 1.2%, and the cyclic stabilization at the total strain amplitudes of 0.4%, 0.6% and 0.8%. At -40°C, however, the cyclic stability is observed during whole fatigue deformation at the total strain amplitudes of 0.4%, 0.5%, 0.6%, 0.7% and 0.8%. The relationship between the elastic strain amplitude, plastic strain amplitude and reversals to failure can be described by Basquin and Coffin-Manson equations, respectively. In addition, the observation results of fatigue fracture surfaces reveal that the cracks initiate at the free surface of fatigue specimen and propagate in a transgranular mode.

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Section: Intrductionmentioning

confidence: 99%

Low-cycle fatigue behavior of extruded Al-7Zn-2Mg-1.5Cu-0.2Sc-0.1Zr alloy at room and low temperatures

Zhu

Chen

et al. 2018

MATEC Web Conf.

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“…On one hand, many studies have addressed this by experimentally observing the crack initiation and propagation in aluminum alloy with localized corrosion [3][4][5][6][7][8]. Fractographic analysis via scanning electron microscopy (SEM) observation showed that corrosion pits caused accelerated multiple-site cracks initiation in AA2024-T3 [9].…”

Section: Introductionmentioning

confidence: 99%

In-situ SEM study of fatigue micro-crack initiation and propagation behavior in pre-corroded AA7075-T7651

Song

Liu

Zhang

et al. 2020

International Journal of Fatigue

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A Novel Fatigue Crack Angle Quantitative Monitoring Method Based on Rotating Alternating Current Field Measurement

Yuan,

Li,

Zhao

et al. 2024

Recent Development of Alternating Current Field Measurement Combine With New Technology

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Under complicated fatigue loading conditions, cracks initiate nd grow in the arbitrary direction from corrosion pits in the aerospace equipment. The monitoring of crack propagation angle is very important for the safety assessment of the aerospace equipment, which is still a challenge by the conventional structural health monitoring (SHM) method. In this paper, a novel crack angle quantitative monitoring method is presented based on the rotating alternating current field measurement (RACFM). A theoretical model of the crack angle measuring method is established to analyze the perturbation principle of the induced electromagnetic field. The relationships between the angle, length and depth of the crack and the Bz signal are analyzed. The probe and testing system are established, and experiments are carried out. The results show that the phase of the Bz signal has a linear relationship with the crack angle for the same crack, and the amplitude of the Bz signal can correct the crack angle for the different cracks. The angle of fatigue cracks can be quantitatively measured by the Bz phase difference method based on the RACFM.

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Investigation into Corrosion Pit-to-Fatigue Crack Transition in 7075-T6 Aluminum Alloy

Cited by 7 publications

References 15 publications

Low-cycle fatigue behavior of extruded Al-7Zn-2Mg-1.5Cu-0.2Sc-0.1Zr alloy at room and low temperatures

Low-cycle fatigue behavior of extruded Al-7Zn-2Mg-1.5Cu-0.2Sc-0.1Zr alloy at room and low temperatures

In-situ SEM study of fatigue micro-crack initiation and propagation behavior in pre-corroded AA7075-T7651

A Novel Fatigue Crack Angle Quantitative Monitoring Method Based on Rotating Alternating Current Field Measurement

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