Plastic Zones at a Fatigue Crack Tip

Gwider, Albashir; Ranganathan, Naryanaswami

doi:10.1007/s11668-019-00646-6

Cited by 2 publications

(6 citation statements)

References 10 publications

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“…Such an amount of data points appears to be sufficient to properly characterise the Vickers hardness evolution around the crack tip. Hence, the resolution achieved is up to 57 times higher than in previous works [ 20 , 23 , 25 , 26 ]. The data were linearly interpolated to generate the contour plots.…”

Section: Resultsmentioning

confidence: 66%

“…Consequently, it is necessary to cut a fragment of the specimen. This is in contrast to recent works where the plastic zone was estimated with indentation measurements directly taken on the specimen [ 26 ]. Such a fragment should be noticeably larger than the plastic zone so that the procedure does not have an effect on the estimation.…”

Section: Micro-indentation Techniquementioning

confidence: 63%

“…The similar behaviour in the three specimens cross-validates the current methodology. The two different slopes were also identified in different materials [ 20 , 23 , 25 , 26 ]. The initial surge just ahead of the crack tip was also detected by Ghodrat and co-authors on a 6061-T4 aluminium alloy [ 20 ].…”

Section: Resultsmentioning

confidence: 99%

“…By using higher-end microscopes and imaging systems, the quality of the readings can be improved. Nevertheless, by using relatively simple arrangements such as the current set-up, the plastic zone analysis is more accurate than previous studies [ 20 , 23 , 25 , 26 ]. The measurements were made with ImageJ open-source software (version 1.40 g) [ 31 ].…”

Section: Micro-indentation Techniquementioning

confidence: 87%

“…Nevertheless, their plastic zone characterisation was based on measuring the hardness along single directions. Subsequent works extended the methodology to four different directions [ 25 , 26 ]. Their measurements consisted of measuring the hardness radially from the crack tip.…”

Section: Introductionmentioning

confidence: 99%

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Estimation of the Plastic Zone in Fatigue via Micro-Indentation

et al. 2021

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Accurate knowledge of the plastic zone of fatigue cracks is a very direct and effective way to quantify the damage of components subjected to cyclic loads. In this work, we propose an ultra-fine experimental characterisation of the plastic zone based on Vickers micro-indentations. The methodology is applied to different compact tension (CT) specimens made of aluminium alloy 2024-T351 subjected to increasing stress intensity factors. The experimental work and sensitivity analysis showed that polishing the surface to #3 μm surface finish and applying a 25 g-force load for 15 s produced the best results in terms of resolution and quality of the data. The methodology allowed the size and shape of both the cyclic and the monotonic plastic zones to be visualised through 2D contour maps. Comparison with Westergaard’s analytical model indicates that the methodology, in general, overestimates the plastic zone. Comparison with S355 low carbon steel suggests that the methodology works best for alloys exhibiting a high strain hardening ratio.

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Section: Resultsmentioning

confidence: 66%

Section: Micro-indentation Techniquementioning

confidence: 63%

Section: Resultsmentioning

confidence: 99%

Section: Micro-indentation Techniquementioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Estimation of the Plastic Zone in Fatigue via Micro-Indentation

et al. 2021

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Parametric characterization of the Christopher–James–Patterson model for crack propagation in welded zone of A7N01 Aluminum alloys

Liu,

Lu,

Wang

et al. 2024

Fatigue Fract Eng Mat Struct

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Aluminum alloy is a widely used material in railway vehicle structures. In order to accurately analyze the crack propagation mechanism of Aluminum alloy welding structures and predict their crack propagation life, this study focuses on the A7N01 Aluminum alloy and proposes a full‐field strain solution method based on the least‐squares method. For the first time, digital image correlation (DIC) experimental measurements are combined with the finite element analysis method to determine the shape and size of the plastic zone at the crack tip of the compact tension (CT) specimen. And it also calculates the crack propagation driving force parameters of the Christopher–James–Patterson (CJP) model using traditional crack propagation driving parameters. The research results revealed that the plastic zone at the crack tip captured by DIC experiments is in good agreement with the finite element simulation results. Additionally, the crack growth rate curve of the A7N01 Aluminum alloy, fitted based on the CJP model, is insensitive to the stress ratio. The results offer an effective approach to utilizing the da/dN‐∆KCJP curve in analyzing A7N01 Aluminum alloy and welded structural failures, broadening the scope of engineering applications for the CJP model.

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Plastic Zones at a Fatigue Crack Tip

Cited by 2 publications

References 10 publications

Estimation of the Plastic Zone in Fatigue via Micro-Indentation

Estimation of the Plastic Zone in Fatigue via Micro-Indentation

Parametric characterization of the Christopher–James–Patterson model for crack propagation in welded zone of A7N01 Aluminum alloys

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