Energy based analysis of crack tip plastic zone of AA2024-T3 under cyclic loading

Breitbarth, Eric; Besel, Michael

doi:10.1016/j.ijfatigue.2017.03.029

Cited by 36 publications

(24 citation statements)

References 17 publications

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“…While the interaction integral is just able to determine K I and K II the decomposition method of the J-integral in also able to compute K III based on the DIC data [18]. Generally, digital image correlation is very useful to evaluate the actually present damage process at the (fatigue) crack tip itself [19,20]. Against this background the present paper elucidates important tools and provides a detailed comparison of DIC based fracture mechanical parameters computed using line integrals and EDI.…”

Section: Introductionmentioning

confidence: 99%

Determination of Stress Intensity Factors and J integral based on Digital Image Correlation

Breitbarth

Strohmann

Besel

et al. 2019

Frattura Ed Integrità Strutturale

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Digital image correlation (DIC) is a technique in experimental mechanics to acquire full-field measurement data of displacements and deformations from the surface of specimens or components. Especially for the investigations of cracks it provides additional benefits. The actually present deformation field in the vicinity of the crack tip can be obtained which directly reflects for example crack closure effects or plasticity. Against this background the paper summarizes a procedure to compute the J integral and the stress intensity factors K I and K II based on DIC data. For this purpose the J and interaction integral are computed as line and domain integrals. Through experiments it is shown that the domain integral is less affected by scatter of the DIC data. Furthermore, the specific domain, facet sizes and facet distances slightly influence the results.

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Section: Introductionmentioning

confidence: 99%

Determination of Stress Intensity Factors and J integral based on Digital Image Correlation

Breitbarth

Strohmann

Besel

et al. 2019

Frattura Ed Integrità Strutturale

Self Cite

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“…However, their experiments were limited to measure that of the plastic zone under static load. Zhang et al [9] proposed an in situ microscopy fatigue testing method to measure the size of the forward and reversed PZ under cyclic loadings for Al-7075-T6. However, only one loading cycle was studied during the experiment.…”

Section: Introductionmentioning

confidence: 99%

In Situ Measurements for Plastic Zone Ahead of Crack Tip and Continuous Strain Variation under Cyclic Loading Using Digital Image Correlation Method

Zhao

Dai

et al. 2020

Metals

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Fatigue crack is one of the most common damage forms for aeronautical aluminum alloy. With crack propagation, the strain fields of the whole object surface and plastic zone (PZ) ahead of the crack tip are changing continuously. For most metallic materials, the behavior of PZ around the crack tip and continuous strain variation play a vital role in crack propagation. In this work, the “continuous” strain information at and in front of the crack tip on the specimen surface was obtained quantitatively and the PZ size ahead of crack tip was in situ measured quantitatively with crack propagation by using the digital image correlation (DIC) method, which overcomes the difficulty for the in situ measurement of mechanical variables. Moreover, the method of specimen preparation was simplified by using a white matt paint with strong adhesion, but also resulted in a higher resolution being shown, even for such a large area. Furthermore, the experimental results of the PZ size from the proposed method had good agreement with the theoretical values, which overcomes the limitation that the conventional approaches only consider the quasi-static crack. Finally, the continuous strain variation behavior was analyzed from the experimental results in detail with the consideration of crack propagation.

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“…There is literature [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] on the topic of the plastic energy dissipation during the fatigue crack propagation. Most of the papers aim at finding the relation between the plastic energy dissipation per cycle (dW/dN) and da/dN, and their work could be summarized as:…”

Section: Introductionmentioning

confidence: 99%

“…Smith [15] assumes that the energy dissipation to create a unit of new crack surface could be considered as a material property and applies this assumption to simulate fatigue crack growth with 3D finite element model. Besel et al [16][17] study AA2024-T3 plastic dissipation with digital image correlation (DIC) method and coupled FE simulation. From the work mentioned above, although with some slight differences, there seems to be a contradiction between the work of [1][2][3][4][5][6]15] and [12][13]: some researchers seem to believe that the dW/da value is a material property, MATEC Web of Conferences 165, 13002 (2018) https://doi.org/10.1051/matecconf/201816513002 FATIGUE 2018 but the others disagree with this.…”

Section: Introductionmentioning

confidence: 99%

The stress ratio effect on plastic dissipation during fatigue crack growth

2018

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Plastic energy dissipation is inevitable during fatigue crack growth. There have been previous attempts reported in literature to correlate the plastic dissipated energy (dW/dN) to fatigue crack growth rate (da/dN). However, at a given dW/dN, the da/dN changes with the ratio of minimum and maximum loads, known as the stress ratio. This paper describes an experimental study carried out on 2024-T3 central crack tension specimens to quantify the relation between dW/dN and da/dN. By selecting different stress ratios in the individual tests, the experiments reveal the influence of the stress ratio on this relationship. It is evident that dW/dN has no unique relationship with da/dN valid for the tested stress ratios. Instead, the relationship for each stress ratio is different. This is illustrated with the value of plastic dissipation per unit of fatigue crack growth (dW/da), representing the effective resistance to the crack increment. This value is not a constant, but changes with the stress ratios and da/dN values. Hence the plastic energy dissipation cannot be used directly for predicting crack growth.

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Energy based analysis of crack tip plastic zone of AA2024-T3 under cyclic loading

Cited by 36 publications

References 17 publications

Determination of Stress Intensity Factors and J integral based on Digital Image Correlation

Determination of Stress Intensity Factors and J integral based on Digital Image Correlation

In Situ Measurements for Plastic Zone Ahead of Crack Tip and Continuous Strain Variation under Cyclic Loading Using Digital Image Correlation Method

The stress ratio effect on plastic dissipation during fatigue crack growth

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