Torsional fatigue mechanisms of an A357-T6 cast aluminium alloy

Serrano-Muñoz, Itziar; Shiozawa, Daiki; Dancette, Sylvain; Verdu, Catherine; Buffière, Jean‐Yves

doi:10.1016/j.actamat.2020.09.046

Cited by 11 publications

(6 citation statements)

References 43 publications

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“…Once the fatigue cracks initiate on the maximum shear stress planes, the maximum principal stress will play a dominant role in the crack transformation from Stage I to Stage II, thereby promoting the propagation of fatigue cracks [49]. Higher principal stress can lead to the occurrence of the Stage II crack propagation, and thus the fracture surfaces are different under different stress amplitudes [51].…”

Section: Fracture Mechanismmentioning

confidence: 99%

Effect of Surface Mechanical Attrition Treatment on Torsional Fatigue Properties of a 7075 Aluminum Alloy

Li¹,

Retraint

Gao

et al. 2022

Metals

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The effect of Surface Mechanical Attrition Treatment (SMAT) on torsional fatigue properties of a 7075 aluminum alloy was investigated. A number of fatigue samples were heat treated to increase the sensitivity of the material to SMAT. Compared with the as-machined (AM) samples, the fatigue lives of their SMATed counterparts (AM-SMAT) tested under torsional loading increased under high stress amplitudes, but decreased under low amplitudes. However, the fatigue lives of heated and SMATed samples (HT-SMAT) increased under all the investigated stress amplitudes, compared with those that were heat treated (HT). It was also revealed that the cracking mechanisms are different for the samples in different states, and they are dependent on the imposed stress levels. The results show that SMAT could have both beneficial and detrimental effects on the fatigue lives depending on the testing conditions. The roles played by various factors, including residual stresses, grain refinement, and surface roughness, were analyzed and discussed to interpret the results.

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Section: Fracture Mechanismmentioning

confidence: 99%

Effect of Surface Mechanical Attrition Treatment on Torsional Fatigue Properties of a 7075 Aluminum Alloy

Li¹,

Retraint

Gao

et al. 2022

Metals

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“…XCT, however, is naturally limited by its resolution and for the comprehensive investigation of the new materials at all scales should be often complemented by microscopy. Combining XCT acquisitions with a relevant loading scenario (in-situ testing) helps to give insight of the failure mechanism and damage behaviour of the material [19,20]. Such insights could be used not only for general description of damage in a material but for modelling or calibration of the mechanical experiment [21].…”

Section: Introductionmentioning

confidence: 99%

Microstructure, mechanical properties and fracture mechanisms in a 7017 aluminium alloy tailored for powder bed fusion – laser beam

Mehta¹,

Mishurova²,

Evsevleev³

et al. 2023

Materials & Design

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“…Besides, there are indeed some studies on other type of microstructures under torsional fatigue loading, such as the δ ferrite grains in martensitic stainless steel, [18] coarse-grained copper, [19,20] and cast aluminum. [21] Those investigation showed that a different loading-mode condition might result in a different stress state and consequently a different fatigue crack initiation and growth behavior.…”

Section: Introductionmentioning

confidence: 99%

Crack Initiation Mechanism of AISI 4340 Steel for High‐Cycle Torsional Fatigue Loading

Wang

Zhang

et al. 2023

steel research int.

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The nucleation of microstructural fatigue cracks in AISI 4340 steel is investigated. The pre‐electropolished specimen is employed for the observation of the very early stage of fatigue crack initiation correlated with the microstructure. It is found that there are precipitate‐free zones (PFZs) around the lath and packet boundary, and the strength of PFZ is lower than that of the lath due to the lack of second‐phase strengthening. Therefore, the fatigue crack would first initiate within the PFZ. Besides, the initiated crack plane usually is the maximum shear stress plane. However, the MnS inclusions would cause stress concentration so that the lath boundary (LB) deviating from the maximum shear stress plane could also have sufficient driving force to crack. In contrast, when the LB is vertical to the cracked MnS inclusion, it would prevent the crack from propagating into the matrix because of the anisotropy of lath martensite. The effects of the stress concentration caused by the MnS inclusion on the maximum deviation angle and the S‐N curve are discussed.

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Torsional fatigue mechanisms of an A357-T6 cast aluminium alloy

Cited by 11 publications

References 43 publications

Effect of Surface Mechanical Attrition Treatment on Torsional Fatigue Properties of a 7075 Aluminum Alloy

Effect of Surface Mechanical Attrition Treatment on Torsional Fatigue Properties of a 7075 Aluminum Alloy

Microstructure, mechanical properties and fracture mechanisms in a 7017 aluminium alloy tailored for powder bed fusion – laser beam

Crack Initiation Mechanism of AISI 4340 Steel for High‐Cycle Torsional Fatigue Loading

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