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In-situ microscopy testing of plasticity variation ahead of fatigue crack tip in AL2024-T3

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Abstract

In this paper, an in-situ experiment is performed under the optical microscopy to investigate the continuous variation of the strain field in the vicinity of the fatigue crack tip in Al2024-T3. The specimen is a small thin plate with an edge-crack, whose surface is speckled with tiny and dense spots with random-shapes. The applied load cycle is divided into a certain number of steps at which high resolution images around the crack tip are taken and recorded by a microscope camera. Once collecting the series of images, the strain distributions at each load step can be evaluated through the digital image correlation technique. Consequently, the continuous variation of the strain field ahead of the crack tip within the applied load cycle can be estimated approximately. Then combining the experimental measurements with the material constitutive relationship, the plastic zone sizes at different load levels can be calculated. In the current study, the continuous variations of the retensile and reversed plastic zones with different stress ratios are measured. Furthermore, the investigation is extended to the simple variable loading case, in which the plastic zone variation is traced before, during and after the single overload. It is shown that the plastic zone experiences an immediate reduction after the overload and gradually restores to the previous level. The crack closure effect and plasticity-induced loading interaction are analyzed. Finally, several conclusions are drawn based on the current investigation.

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Abbreviations

K:

Applied stress intensity factor

\(\sigma \) :

Applied stress

R:

stress ratio

a:

Crack length

\(K_{\mathrm{closure}}\) :

Crack closure stress intensity factor

\(K_{\mathrm{open}}\) :

Crack opening stress intensity factor

\({\rho }_{f}\) :

Retensile plastic zone size

\({\rho }_{r}\) :

Reversed plastic zone size

\({\varepsilon }_{y}\) :

Tensile yield strain

\({\sigma }_{y}\) :

Tensile yield strength

N:

Load cycles

F:

Geometry correction factor

T:

Thickness of the specimen

W:

Width of the specimen

L:

Length of the specimen

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Acknowledgements

This research reported in this paper was financially supported by National Natural Science Foundation of China (No. 51875019).

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Authors and Affiliations

  1. Science and Technology on Reliability and Environmental Engineering Laboratory, School of Reliability and Systems Engineering, Beihang University, Beijing, 100191, China

    Wei Zhang, Liang Cai, Daoqing Zhou & Fuqiang Sun

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  1. Wei Zhang
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  2. Liang Cai
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  3. Daoqing Zhou
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  4. Fuqiang Sun
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Correspondence to Fuqiang Sun.

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Zhang, W., Cai, L., Zhou, D. et al. In-situ microscopy testing of plasticity variation ahead of fatigue crack tip in AL2024-T3. Int J Fract 216, 59–70 (2019). https://doi.org/10.1007/s10704-018-00340-y

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