Acta Univ. Agric. Silvic. Mendelianae Brun. 2013, 61(1), 39-49 | DOI: 10.11118/actaun201361010039

Fatigue strength tests of layered steel

Michal Černý1, Pavel Mazal2, Josef Filípek1, Petr Dostál1
1 Department of Engineering and Automobile Transport, Mendel University in Brno, Zemědělská 1, 613 00 Brno, Czech Republic
2 Institute of Machine and Industrial Design, University of Technology Brno, Technická 2, 616 69 Brno, Czech Republic

The work deals with original measurement of fatigue properties of formed layered steel material - damask steel. This is a material that exhibits a fine micro-structure as well as a regular composition of many material layers with complementary properties. The article experimentally verifies high-cycle fatigue properties of layered steel and evaluates them from the point of view of fatigue tests of conventional steel materials and a parallel application of a non-destructive - acoustic emission - testing. Finally, it discusses the influence of production on fatigue strength and the possibilities of using multi-layered steel materials in technological practice.
A serious result of this pilot experiment is the fact documented no only by the fractographic observation, but mainly by the AE records that the fatigue service life of this material is high if it its not stressed by tension approximating the yield point Re. However, such stress is not common in practical use of tools made of damask steel and thus under common bending stress an exceptionally long service life of tools made of this type of material is demonstrable. The fact that damask steel behaves like a homogeneous material is mainly confirmed by the records of the AE signal at lower values of stress σa. When stressed by higher amplitudes of tension σa damask responds in AE records similarly to a laminate material that is stressed by bending.

Keywords: damask steel, fatigue tests, crack propagation, non-destructive testing, acoustic emission
Grants and funding:

The research has been supported by the project IP 10/2010 "Proportional monitoring of the Acoustic emission in crypto-conditions", financed by internal grant agency (IGA) Mendel University in Brno, Faculty of Agronomy. Above mentioned results were created also as a part of solution of the project MPO CR FR-TI1/371 "Integrated system of monitoring of selected machine parts" and supported by European Regional Development Fund in the framework of the research project NETME Centre under the Operational Programme Research and Development for Innovation (reg. No. CZ. 1.05/2.1.00/01.0002).

Received: September 18, 2012; Published: April 8, 2013  Show citation

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Černý, M., Mazal, P., Filípek, J., & Dostál, P. (2013). Fatigue strength tests of layered steel. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 61(1), 39-49. doi: 10.11118/actaun201361010039
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