# Statistical features of magnetic noise in mixed-type impact fracture

## Abstract

We study the statistical features of magnetic noise accompanying the dynamic fracture of steel samples during mixed type fracture, where the overall ductile character of crack propagation is interrupted by a sudden brittle jump. The structure of the voltage time series is investigated by identifying discrete peaks which correspond to elementary steps of the jerky cracking process. We show that the height, duration, area, and energy of peaks have power law distributions with exponents falling close to the corresponding values of pure ductile fracture. For single peaks, a power law correlation of the height and area with the width is evidenced; however, the mixed nature of fracture gives rise to a crossover between two regimes of different exponents. The average pulse shape of micro-cracking events has a parabolic form with a right handed asymmetry similarly to quasi-static fracture propagation. The asymmetry emerges due to stress localization at the advancing crack front.

- Authors:

- Department of Theoretical Physics, University of Debrecen, P.O. Box 5, H-4010 Debrecen (Hungary)
- Bay Zoltán Nonprofit Ltd. for Applied Research, H-1116 Budapest, Fehérvári út 130 (Hungary)

- Publication Date:

- OSTI Identifier:
- 22412637

- Resource Type:
- Journal Article

- Resource Relation:
- Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 6; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ASYMMETRY; BRITTLENESS; CORRELATIONS; CRACK PROPAGATION; CRACKING; CRACKS; ELECTRIC POTENTIAL; FRACTURES; MAGNETISM; PULSE SHAPERS; STEELS; STRESSES

### Citation Formats

```
Danku, Zs., Kun, F., E-mail: ferenc.kun@science.unideb.hu, and Lenkey, Gy. B.
```*Statistical features of magnetic noise in mixed-type impact fracture*. United States: N. p., 2015.
Web. doi:10.1063/1.4908184.

```
Danku, Zs., Kun, F., E-mail: ferenc.kun@science.unideb.hu, & Lenkey, Gy. B.
```*Statistical features of magnetic noise in mixed-type impact fracture*. United States. doi:10.1063/1.4908184.

```
Danku, Zs., Kun, F., E-mail: ferenc.kun@science.unideb.hu, and Lenkey, Gy. B. Mon .
"Statistical features of magnetic noise in mixed-type impact fracture". United States.
doi:10.1063/1.4908184.
```

```
@article{osti_22412637,
```

title = {Statistical features of magnetic noise in mixed-type impact fracture},

author = {Danku, Zs. and Kun, F., E-mail: ferenc.kun@science.unideb.hu and Lenkey, Gy. B.},

abstractNote = {We study the statistical features of magnetic noise accompanying the dynamic fracture of steel samples during mixed type fracture, where the overall ductile character of crack propagation is interrupted by a sudden brittle jump. The structure of the voltage time series is investigated by identifying discrete peaks which correspond to elementary steps of the jerky cracking process. We show that the height, duration, area, and energy of peaks have power law distributions with exponents falling close to the corresponding values of pure ductile fracture. For single peaks, a power law correlation of the height and area with the width is evidenced; however, the mixed nature of fracture gives rise to a crossover between two regimes of different exponents. The average pulse shape of micro-cracking events has a parabolic form with a right handed asymmetry similarly to quasi-static fracture propagation. The asymmetry emerges due to stress localization at the advancing crack front.},

doi = {10.1063/1.4908184},

journal = {Applied Physics Letters},

number = 6,

volume = 106,

place = {United States},

year = {Mon Feb 09 00:00:00 EST 2015},

month = {Mon Feb 09 00:00:00 EST 2015}

}