In situ X-ray imaging of fatigue crack growth from multiple defects in additively manufactured AlSi10Mg alloy

Qian, Weijian; Wu, Shengchuan; Wu, Zhengkai; Ahmed, Saad; Zhang, Wen; Qian, Guian

doi:10.1016/j.ijfatigue.2021.106616

Cited by 50 publications

(18 citation statements)

References 46 publications

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“…By developing an in situ tensile and compression testing system mounted at the BL13W1 beamline of the Shanghai Synchrotron Radiation Facility (SSRF) in China, [32][33][34][35] the 3D mesostructural features and resultant deformation of the 316L ASFFs were obtained using the Avizo and Volume studio software. As illustrated in Figure 3, both the loading frame of the miniature loading device and the ASFF specimens were fully penetrated by the high-energy X-rays emitted from the electron-storage ring, and the penetration signals from the 316L fiber felt specimens were detected by the high-resolution charge-coupled device (CCD) detector (16 bit dynamic; 2048 Â 2048 pixel array; 3.25 μm pixel size), which could identify the mesostructural features of the ASFF specimens.…”

Section: X-ray Imaging Of the Mesostructurementioning

confidence: 99%

In Situ X‐Ray Tomography of Sintered Metal Fiber Felts Exhibiting Auxetic Effect under Tension and Compression

Wang

et al. 2022

Adv Eng Mater

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Sintered metal fiber felts (SMFFs) are kinds of the strongest auxetic materials to date, but there are significant differences in the reported auxeticities, due to the lack of investigation on the fabrication process. This study is performed to analyze the influence of fabrication process and structural features on the auxetic effect exhibited by SMFFs. The sequence of compression and sintering processes determines the volume density of the interfiber‐sintered joints and the resulting Poisson's ratio behavior under tension and compression. The SMFFs with a low volume density exhibit strong auxetic effect under tension and achiev a positive Poisson's ratio under compression because of the weak interfiber layer bonding. In contrast, the felts with a high density of interfiber joints reveal a relatively weak auxetic effect under both tension and compression. Moreover, an increase in the thickness and a decrease in the porosity reduce the auxetic effect. In addition, in situ X‐Ray tomography of the tensile testing is performed to elucidate the mechanism of the auxetic effect. To explain the observed Poisson's ratio behavior under tension and compression, periodical finite‐element modeling with real mesostructures is performed. Herein, a new insight into the relationship between the structure features and the Poisson's ratio behaviors is given.

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Section: X-ray Imaging Of the Mesostructurementioning

confidence: 99%

In Situ X‐Ray Tomography of Sintered Metal Fiber Felts Exhibiting Auxetic Effect under Tension and Compression

Wang

et al. 2022

Adv Eng Mater

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“…, 2016). Although the latest instrument is employed to study the internal crack growth by the synchrotron radiation technique, the current date is yet to give the results with sufficient resolution and fatigue regime because of certain drawbacks (Qian et al , 2022; Geng et al. , 2021).…”

Section: Introductionmentioning

confidence: 99%

Development of a photomicroscope method for in situ damage monitoring under ultrasonic fatigue test

Tan

Postel

Liu

et al. 2022

IJSI

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PurposeMechanical issues related to the information and growth of small cracks are considered to play a major role in very high cycle fatigue (VHCF) for metallic materials. Further efforts on better understanding in early stage of a crack are beneficial to estimating and preventing catastrophic damage for a long period service.Design/methodology/approachDependent on the ultrasonic loading system, a novel method of in situ photomicroscope is established to study the crack behaviors in VHCF regime.FindingsThis in situ photomicroscope method provides advantages in combination with fatigue damage monitoring at high magnification, a large number of cycles, and efficiency. Visional investigation with attached image proceeding code proves that the method has high resolution on both size and time, which permits reliable accuracy on small crack growth rate. It is observed that the crack propagation trends slower in the overall small crack stage down to the level of 10–11 m/cycle. Strain analysis relays on a real-time recording which is applied by using digital image correlation. Infrared camera recording indicates the method is also suitable for thermodynamic study while growth of damage.Originality/valueBenefiting from this method, it is more convenient and efficient to study the short crack propagation in VHCF regime.

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“…7 This technique has also been utilized in fatigue research to investigate crack behavior in metallic materials. [8][9][10][11][12][13][14] In particular, thirdgeneration SR facilities equipped with insertion devices, such as ESRF in France, APS in the US, and SPring-8 in Japan, can provide high-brightness SR of very high intensity, which makes it possible to carry out an NDI with a high spatial resolution of 1 μm or less. This excellent ability makes it possible to detect internal defects and observe small fatigue cracks nondestructively.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, synchrotron radiation CT (SR‐CT) has gained increasing attention as a novel nondestructive inspection (NDI) technique in the field of material strength and failure analysis 7 . This technique has also been utilized in fatigue research to investigate crack behavior in metallic materials 8–14 . In particular, third‐generation SR facilities equipped with insertion devices, such as ESRF in France, APS in the US, and SPring‐8 in Japan, can provide high‐brightness SR of very high intensity, which makes it possible to carry out an NDI with a high spatial resolution of 1 μm or less.…”

Section: Introductionmentioning

confidence: 99%

Detection of small internal fatigue cracks in Ti‐6Al‐4V via synchrotron radiation nanocomputed tomography

Xue

Tomoda

Nakamura

et al. 2022

Fatigue Fract Eng Mat Struct

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Two types of synchrotron radiation computed tomography (SR‐CT)—projection CT (micro‐CT) and phase‐contrast imaging CT (nano‐CT)—were used to observe internal fatigue cracks in (α + β) Ti‐6Al‐4V alloy. Micro‐CT detected cracks in the specimen at ~1 μm spatial resolution, and the nano‐CT provided magnified images at ~200 nm spatial resolution. The crack initiation sites were clarified as the α‐phase for both the surface and internal cracks; however, their opening behaviors differed. A sharp crack tip was observed in the surface crack, and the crack tip opening displacement (CTOD) increased with an increase in the applied load. By contrast, a blunted crack tip, similar to that of a crack in a vacuum, was observed for the internal crack, and its CTOD remained almost constant regardless of the applied load. These phenomena are likely to explain the different behaviors of surface and internal cracks, particularly the slower growth rate of internal cracks, which leads to a longer fatigue life in the very high cycle fatigue regime.

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In situ X-ray imaging of fatigue crack growth from multiple defects in additively manufactured AlSi10Mg alloy

Cited by 50 publications

References 46 publications

In Situ X‐Ray Tomography of Sintered Metal Fiber Felts Exhibiting Auxetic Effect under Tension and Compression

In Situ X‐Ray Tomography of Sintered Metal Fiber Felts Exhibiting Auxetic Effect under Tension and Compression

Development of a photomicroscope method for in situ damage monitoring under ultrasonic fatigue test

Detection of small internal fatigue cracks in Ti‐6Al‐4V via synchrotron radiation nanocomputed tomography

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