A grain boundary interaction model for microstructurally short fatigue cracks

Panwar, Shardul S.; Adams, J. F.; Allison, J.; Jones, J. W.; Sundararaghavan, Veera

doi:10.1016/j.ijfatigue.2018.04.029

Cited by 17 publications

(6 citation statements)

References 17 publications

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“…[44][45][46] The twist angle, or the angular sweep along the GB plane between the two adjacent basal planes, is observed to display minimal influence on intragranular crack path selection. Tilt and twist angles at GBs have been previously observed to correlate to crack path selection and the degree of crack growth retardation prior to CF-GB intersections in Al alloys 47 and slow crack propagation in Mg alloys 19,48 ; however, the exact impact of the parameters on crack path selection in Mg alloys is not well understood. In the current investigation, half of the CF-GB events with leading basal crack growth occurred between grain pairs with a Twist BÀB > 66 , and similar behavior is also observed for non-basal crack growth and non-basal twist angles.…”

Section: Intragranular Short-crack Path Selection In We43mentioning

confidence: 99%

Quantitative analysis of three‐dimensional fatigue crack path selection in Mg alloy WE43 using high‐energy X‐ray diffraction microscopy

Greeley,

Adams,

Kenesei

et al. 2024

Fatigue Fract Eng Mat Struct

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Fatigue short‐cracks in Mg alloys display complex growth behavior due to high plastic anisotropy and crack path dependence on local microstructural features. In this study, the three‐dimensional crystallography of short‐crack paths in Mg alloy WE43 was characterized by mapping near‐field high‐energy X‐ray diffraction microscopy (HEDM) reconstructed grain maps to high‐resolution X‐ray CT reconstructions of the fracture surfaces in the crack initiation and short‐crack growth regions of six ultrasonic fatigue specimens. Crack–grain–boundary intersections were analyzed at 81 locations across the six crack paths. The basal intragranular, non‐basal intragranular, or intergranular character of short‐crack growth following each boundary intersection was correlated to crystallographic and geometric parameters of the trailing and leading grains, three‐dimensional grain boundary plane, and advancing crack front. The results indicate that crack paths are dependent on the combined crystallographic and geometric character of the local microstructure, and crack path prediction can be improved by use of dimensionality reduction on subsets of high‐linear‐correlation microstructural parameters.

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Section: Intragranular Short-crack Path Selection In We43mentioning

confidence: 99%

Quantitative analysis of three‐dimensional fatigue crack path selection in Mg alloy WE43 using high‐energy X‐ray diffraction microscopy

Greeley,

Adams,

Kenesei

et al. 2024

Fatigue Fract Eng Mat Struct

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“…18 Furthermore, the grain size and texture vary among the fracture surfaces in the three specimen orientations, emphasizing the significance of grain boundaries and texture in influencing the differential crack initiation and propagation behavior. 24 4 | DISCUSSIONS…”

Section: Cross-section Analysis Of the Initiation Sitementioning

confidence: 99%

The effect of texture on the very high cycle fatigue performance and deformation mechanism of rolled AZ31B magnesium alloys

Zhan,

Wang,

Dai

et al. 2024

Fatigue Fract Eng Mat Struct

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Rolling can result in anisotropy in the microstructure and mechanical properties of the sheet material. This study focuses on the very high cycle fatigue (VHCF) performance of magnesium alloys in the rolling direction (RD), normal direction (ND), and the bisecting angle between the ND and RD (ND–RD). The findings reveal that RD specimens demonstrate superior fatigue performance, while the ND specimens exhibit the lowest fatigue resistance. During the crack initiation stage, the primary influential factor is the maximum shear stress. Due to c‐axis alignment with ND direction in grains, the deformation mode for ND and RD specimens primarily involves first‐order pyramidal slip, while ND–RD specimens primarily undergo basal slip and prismatic slip. In early stable crack propagation, grain size and texture cause variations in the morphology of the rough area among the three directional specimens. Notably, the RD specimens show faster crack propagation during crack initiation than early stable propagation stage.

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“…These results were simulated using a new crystal elasticity and cyclic cohesive zone model for prediction of microstructural crack trajectories under high cycle fatigue 130,131 or, in selected 2D cases, variational multi-scale modeling. 73,132 The parameters of the cohesive law for crack propagation along various slip systems have been obtained using experimental (micro-beach marking) measurements of local crack growth rates within a grain.…”

Section: Fatigue Behavior Use Casementioning

confidence: 99%

“…an analytical model for the effect of grain boundaries on crack paths, including prediction of grain boundary blocking or transmission of cracks under prescribed external loading based on tilt and twist angles made by the crack planes with respect to the grain boundary. 131 The grain boundary effect is included in the fatigue crack growth model. 130,131 An example of the simulation and experiments is shown in Fig.…”

Section: Fatigue Behavior Use Casementioning

confidence: 99%

See 1 more Smart Citation

PRISMS: An Integrated, Open-Source Framework for Accelerating Predictive Structural Materials Science

Aagesen

Adams

Allison

et al. 2018

JOM

Self Cite

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The Center for Predictive Integrated Structural Materials Science (PRISMS Center) is creating a unique framework for accelerated predictive materials science and rapid insertion of the latest scientific knowledge into next-generation ICME tools. There are three key elements of this framework. The first is a suite of high-performance, open-source integrated multi-scale computational tools for predicting microstructural evolution and mechanical behavior of structural metals. Specific modules include statistical mechanics, phase field, crystal plasticity simulation and real-space DFT codes. The second is the Materials Commons, a collaboration platform and information repository for the materials community. The third element of the PRISMS framework is a set of integrated scientific ''Use Cases'' in which these computational methods are linked with experiments to demonstrate the ability for improving our predictive understanding of magnesium alloys, in particular, the influence of microstructure on monotonic and cyclic mechanical behavior. This paper reviews progress toward these goals and future plans.

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A grain boundary interaction model for microstructurally short fatigue cracks

Cited by 17 publications

References 17 publications

Quantitative analysis of three‐dimensional fatigue crack path selection in Mg alloy WE43 using high‐energy X‐ray diffraction microscopy

Quantitative analysis of three‐dimensional fatigue crack path selection in Mg alloy WE43 using high‐energy X‐ray diffraction microscopy

The effect of texture on the very high cycle fatigue performance and deformation mechanism of rolled AZ31B magnesium alloys

PRISMS: An Integrated, Open-Source Framework for Accelerating Predictive Structural Materials Science

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