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Volume 6 Research & Reviews: Journal of Material Sciences
ISSN: 2321-6212 Advanced Materials 2018
September 04-06, 2018
September 04-06, 2018 | Zürich, Switzerland
21st International Conference on
Advanced Materials & Nanotechnology
Relation between internal friction and fatigue
Wolfgang Gräfe
Private scholar, Germany
The background of internal friction in solids and their fatigue may be theoretically described by a migration of unspecified
items which is caused by the action of mechanical stress gradients. From the two resulting formulae a relation between the
fatigue and the background of internal friction has been deduced. With this relation the statistical distribution of the fatigue
data can be explained to some extent. Data published by Ravilly in 1938 demonstrates the correctness of this theoretical result.
For the case that temperature gradients are the reason for the migration of the unspecified items, a formula results which is
similar to the above mentioned one for the fatigue. With the statistical analysis of the data for fatigue and the total internal
friction it could be possible to answer the question which physical quantity is the cause of fatigue.
Recent Publications:
1. Gräfe W (2000) The effect of the diffusion of interstitial atoms on strength loss of steels. International journal of fatigue
22: 179-188.
2. Gräfe W (2005) Theoretical derivation and experimental examination of the Stromeyer relation for the analysis of
fatigue data. Journal of testing and evaluation 33(3):160-167.
3. GräfeW(2005) A new approach to the experimental determination of the surface energy of solidmetals frommaterials
testing data. Zeitschrift für physikalische Chemie 219:1625-1633.
4. Gräfe W (2006) The activation energy of static fatigue (creep of steel). Journal of testing and evaluation 34:134-148.
5. Gräfe W (2015) Time-dependent mechanical properties of solids: Relaxation of stress and density, strength (fatigue).
Materials Science Foundations 78:1-180.
Biography
Wolfgang Grafe has completed his Degree in Physics at the Humboldt-Universitat in Berlin (GDR) in 1962. In the following years, he worked with semiconductors
and semiconductor surfaces at the Akademie der Wissenschaften in Berlin. With the results of those investigations, he also received the degree Dr. rer. nat. (PhD)
at the Humboldt-Universität in 1969. From 1971, he worked in the field of mechanical properties of mineral glasses. With the results of these investigations he has
completed his Dr. sc. nat. degree at the Akademie der Wissenschaften in Berlin in 1984. He was employed in a Federal Administrative Authority in Berlin from 1991
till his retirement in 2001.
Wolfgang Gräfe, Res. Rev. J Mat. Sci. 2018, Volume 6
DOI: 10.4172/2321-6212-C3-020