Marker load-aided bidirectional fatigue crack growth rate measurement via a semi-elliptical surface crack

Dong, Yiyang; He, Xiuli; Li, Yuhai

doi:10.1016/j.ijfatigue.2018.02.010

Cited by 12 publications

(3 citation statements)

References 25 publications

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“…The potential drop method has also been used to monitor surface crack growth in situ but can be complicated since multiple crack lengths must be derived from single potential drop values . By far, the most common method involves the use of marker bands . In this method, the applied stress is periodically changed in such a way that the appearance of the fracture surface is altered for a specific number of cycles.…”

Section: Experimental Methodssupporting

confidence: 82%

“…A marker ratio of R =0.7 was found to have a good balance of enhanced contrast from its relatively large loading difference but still had a large enough stress amplitude to result in measurable crack growth. This combination matched the recommendation made by Dong et al, which found the optimal marker ratio to be

R_{ml} = 0.65 + 0.5 R_{bl},

where ml stands for “marker load” and bl stands for “baseline load.”…”

Section: Experimental Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Transition modelling of surface flaws to through cracks

Satin

Johnson

Neu

et al. 2020

Fatigue Fract Eng Mat Struct

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Cracks starting at surfaces will grow under fatigue loading conditions both along the surface and in the thickness directions of the component geometry.In those cases where the crack grows through the thickness, the fatigue crack may transition to a corresponding through crack geometry. While the fatigue crack growth behaviour of both the surface flaws and complete through cracks are well understood, the method for modelling the process by which they transition from one to the other is not. This paper seeks to bring greater clarity and understanding to the transition process by implementing a transition method and developing the associated codes and equations to do so based on careful consideration of boundary conditions, experimental data, and finite element simulations. K E Y W O R D S fatigue crack growth, flaw transition, marker banding, part-through cracks, surface flaws

show abstract

Section: Experimental Methodssupporting

confidence: 82%

R_{ml} = 0.65 + 0.5 R_{bl},

where ml stands for “marker load” and bl stands for “baseline load.”…”

Section: Experimental Methodsmentioning

confidence: 99%

Transition modelling of surface flaws to through cracks

Satin

Johnson

Neu

et al. 2020

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…Marker band‐based methods were used by many researchers to tackle the problem mentioned above. As was shown in Dong et al, 38 each load block should contain a baseline load block and a marker load block sharing the same peak load level but with a different stress ratio

R

.…”

Section: Experimental Studymentioning

confidence: 99%

Numerical and experimental investigation of mixed‐mode crack growth in aluminum alloys

Amato

Yarullin

Shlyannikov

et al. 2022

Fatigue Fract Eng Mat Struct

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Fatigue crack growth in Al 2024 and Al 7050 specimens was assessed experimentally and numerically. In the experimental investigation, various specimen configurations and loading conditions were used to achieve pure mode I, pure mode II, and mixed mode I/II, I/III, and I/II/III. Sample configurations were as follows: first, compact tension shear (CTS) specimen to reproduce pure mode-I and pure initial mode-II loading conditions; second, surface crack tension (SCT) specimen to analyze the behavior of semielliptical surface cracks in mode-I and mixed-mode conditions; and third, hollow cylindrical (HC) specimen with initial semielliptical surface crack to analyze fatigue crack growth under complex stress state. In the numerical study, finite element method (FEM) simulations were performed by means of FRANC3D and ABAQUS solver. The numerical predictions were validated with the experimental results. These predictions resulted to be accurate estimation of the crack growth across the broad range of the investigated loading conditions.

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The influence of the microtexture and orientation of columnar grains on the fatigue crack growth of directed energy deposited Ti-6.5Al-2Zr-Mo-V alloys

Wang

et al. 2020

Additive Manufacturing

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Marker load-aided bidirectional fatigue crack growth rate measurement via a semi-elliptical surface crack

Cited by 12 publications

References 25 publications

Transition modelling of surface flaws to through cracks

Transition modelling of surface flaws to through cracks

Numerical and experimental investigation of mixed‐mode crack growth in aluminum alloys

The influence of the microtexture and orientation of columnar grains on the fatigue crack growth of directed energy deposited Ti-6.5Al-2Zr-Mo-V alloys

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