Analysis of the Correlation between Micro-Mechanical Fields and Fatigue Crack Propagation Path in Nodular Cast Iron

Andriollo, Tito; Zhang, Yubin; Fæster, Søren; Kouznetsova, V Varvara

doi:10.2139/ssrn.3477997

Cited by 2 publications

(3 citation statements)

References 9 publications

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“…As is known to all, the macro-crack tends to propagate following the direction perpendicular to the maximum principal stress, and when the state of maximum principal stress at the crack tip changes, deflection occurs during FCG. 20 The more severe the deflection, the longer experience time and the more energy consumed. 12,21 Therefore, the laser bionic specimens exhibited the lower FCG rate.…”

Section: Fatigue Crack Growth Pathmentioning

confidence: 99%

Study of fatigue crack growth characteristics of TIG welded AZ31B magnesium alloy joint based on laser bionic treatment

Shi

Zhang

Sui

et al. 2022

Fatigue Fract Eng Mat Struct

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It is crucial to obtain better fatigue property for the safe application of materials, while nature provides new structural design ideas for effectively improving fatigue property. In this study, a “soft‐hard” alternating bionic structure was fabricated on the surface of TIG welded AZ31B Mg alloy joints by laser bionic treatment (LBT). Microstructure of welded joints was tailored by LBT, resulting in fine equiaxed grains with random orientations and increased microhardness. The fatigue crack growth threshold of the welded joints with bionic structure is increased by more than 40%, and crack growth rate was lower. LBT could significantly affect crack growth behavior and presented obvious crack deflection, resulting in a rougher fracture surface and more second cracks and branches. LBT significantly improved the fatigue crack growth resistance, inducing a series of strengthening mechanisms. The present work opens a new alternative to improve the fatigue properties of welded joints.

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Section: Fatigue Crack Growth Pathmentioning

confidence: 99%

Study of fatigue crack growth characteristics of TIG welded AZ31B magnesium alloy joint based on laser bionic treatment

Shi

Zhang

Sui

et al. 2022

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

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“…An example of this is given in Figure 6, where the 3D reconstruction of a fatigue crack that grows by linking the GPs is depicted. The reconstruction, obtained by segmenting the DVC data, was used to set up a finite element model that unveiled a correlation between the local crack growth direction—which controls the crack roughness and thus affects the amount of energy dissipated—and the predicted micromechanical fields developing in between the GPs 71 …”

Section: Mechanical Loadingmentioning

confidence: 99%

“…The crack color is proportional to the distance from the ideal crack propagation plane that is perpendicular to the X‐axis. Adapted from Andriollo et al 71 …”

Section: Mechanical Loadingmentioning

confidence: 99%

Recent trends in X‐ray‐based characterization of nodular cast iron

Andriollo

Zhang

et al. 2020

Mat Design & Process Comms

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Through various examples, this short review presents the main X‐ray‐based techniques that are available to characterize nodular cast iron at the microstructural level. Emphasis is placed on the enormous potential offered by the recent developments in X‐ray tomography, X‐ray diffraction, and digital volume correlation, which allow collecting microstructural and micromechanical information in 4D (3D plus time) during both casting and subsequent mechanical loading. The goal is to demonstrate that for nodular cast iron, which has an inherently three‐dimensional, composite microstructure, X‐ray‐based techniques provide some significant advantages over conventional microscopy. For this reason, these techniques can be instrumental in unveiling the mechanisms controlling both the formation of the microstructure as well as its micromechanical behavior during in‐service loading, thus paving the way to the development of improved process–structure–property relations.

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Analysis of the Correlation between Micro-Mechanical Fields and Fatigue Crack Propagation Path in Nodular Cast Iron

Cited by 2 publications

References 9 publications

Study of fatigue crack growth characteristics of TIG welded AZ31B magnesium alloy joint based on laser bionic treatment

Study of fatigue crack growth characteristics of TIG welded AZ31B magnesium alloy joint based on laser bionic treatment

Recent trends in X‐ray‐based characterization of nodular cast iron

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