American Journal of Mechanical Engineering
ISSN (Print): 2328-4102 ISSN (Online): 2328-4110 Website: http://www.sciepub.com/journal/ajme Editor-in-chief: Kambiz Ebrahimi, Dr. SRINIVASA VENKATESHAPPA CHIKKOL
Open Access
Journal Browser
Go
American Journal of Mechanical Engineering. 2017, 5(6), 350-354
DOI: 10.12691/ajme-5-6-24
Open AccessArticle

The Fatigue Fracture Caused by a Random Operating Process

Ingrid Delyová1, and Peter Sivák1

1Department of Applied Mechanics and Mechanical Engineering, Faculty of Mechanical Engineering Technical University of Košice, Slovakia

Pub. Date: December 15, 2017

Cite this paper:
Ingrid Delyová and Peter Sivák. The Fatigue Fracture Caused by a Random Operating Process. American Journal of Mechanical Engineering. 2017; 5(6):350-354. doi: 10.12691/ajme-5-6-24

Abstract

The whole structures, mostly the structural nodes or elements work in time-varied stress instead of the static one. The stress concentrators are such changes of shape of mechanical part which evoke the changes of force flow. They influence the stress which loads this part. The risk of fatigue damage concerns structural components, structural knots and even whole structures subjected to random loading. This can initiate the accumulation of fatigue damage in critical points of the structure, growth and spreading of fatigue cracks and, eventually, fatigue fracture. Final failure of structural components may have fatal consequences. Damage and fatigue failure may occur due to a combination of cyclical stress and improper technology for producing a structural element, e.g. during welding. These failures are documented on the example of the holder of a crusher moving knife and of the turbine rotor shaft.

Keywords:
fatigue crack fatigue damage loading stress concentration factor

Creative CommonsThis work is licensed under a Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

Figures

Figure of 8

References:

[1]  M. Růžička, M. Hanke and M. Rost, Dynamická pevnost a životnost. 1. vydanie. ES ČVUT Praha, 1987. 212 s.
 
[2]  F. Trebuňa and F. Šimčák, Pružnosť, pevnosť a plastickosť v strojárstve. 1. vydanie. Emilena Košice, 2005. 484 s. ISBN 80-8073-276-0.
 
[3]  F. Trebuňa and F. Šimčák, Odolnosť prvkov mechanických sústav. Košice: Emilena, 2004. ISBN 80-8073-148-9.
 
[4]  N. E. Dowling, Mechanical Behavior of Materials, Prentice Hall International Edition, 1993.
 
[5]  O. Ostertag and P. Sivák, Degradačné procesy a predikcia životnosti. Typopress Košice, 2010. ISBN 978-80-553-0486-1.
 
[6]  P. Trebuňa, M. Pástor, F. Trebuňa and F. Šimčák, The analysis is of failure causes of the rotor shaft of steam turbines. In. Metalurgija, 56, 2017, p.233-236.