Fatigue and endurance


Summary

The research is focused on fatigue life assessment of mechanical structures operated under complicated load conditions with the aim to assure reliable operation from the fatigue failure point of view. The emphasis is put on probabilistic approach considering the random nature of service loading as well as random nature of material properties of the construction.   

Objectives

The goal of the research was to develop

Achievements

 
Fig 1Fig.1 Layout of fatigue life distribution function calculation: c(p)-DF considering the confidence (prediction) interval for material parameters.
 
Fig 2
Fig.2 Illustration of the verification of fatigue life of construction design. FLDF-fatigue life distribution function of designed construction; Lreq – desired operational endurance of construction; Pa – permissible probability of occurrence of premature fatigue failure; Lg - operational endurance for admissible value of Pa, confirmed  by the calculated FLDF; Pg – probability of occurrence of premature fatigue failure, confirmed  by the calculated FLDF for the Lreq value.

Additional reading

KLIMAN, Vladimír - JELEMENSKÁ, Jana. Fatigue reliability evaluation of structure under random loading using safety criterion. Part I. Methodology. In Kovové materiály, vol.39, 2001, No.3, p. 199-217 (In Slovak).

KLIMAN, Vladimír - JELEMENSKÁ, Jana. Fatigue reliability evaluation of structure under random loading using safety criterion. Part II. Application. In Kovové materiály, vol.39, 2001, No.4, p. 244-262 (In Slovak).

KLIMAN, Vladimír - JÁROŠI, Marián. System of continuous assessment of structure fatigue reliability. Part I. Methodology. In Strojnícky časopis,55, 2004, No. 4, p. 218-234. ISSN 0039-2472 (In Slovak).

KLIMAN, Vladimír - JÁROŠI, Marián. System of continuous assessment of structure fatigue reliability. Part II. Application - experiment . In Strojnícky časopis, 55, 2004, No. 5, p. 293-307. ISSN 0039-2472 (In Slovak).

KLIMAN, Vladimír. Hodnotenie únavovej spoľahlivosti konštrukcií : Fatigue reliability assessment of structure. In ÚFM AV ČR. Životnost materiálů a konstrukcí 2006: sborník semináře. - Brno: ÚFM AV ČR, 2006. ISBN 80-239-6751-7.

KLIMAN, Vladimír. A probabilistic approach to fatigue life estimation under biaxial non-proportional random loading. Part I. Methodology. In Strojnícky časopis, 58, 2007, No. 3, p. 147-167. ISSN 0039-2472 (In Slovak).

KLIMAN, Vladimír. A probabilistic approach to fatigue life estimation under biaxial non-proportional random loading. Part II. Model experiment. In Strojnícky časopis, 58, 2007, No. 3, p. 168-184. ISSN 0039-2472 (In Slovak).

KLIMAN, Vladimír - GIBA, Vladimír - JELEMENSKÁ, Jana - ŠIŠKO, Róbert. Probabilistic approach to fatigue reliability assessment. Part I. Fatigue-life estimation model. In Strojnícky časopis, 61, 2010, No. 4, p. 191-202. ISSN 0039-2472.

KLIMAN, Vladimír - GIBA, Vladimír - JELEMENSKÁ, Jana - ŠIŠKO, Róbert. Probabilistic approach to fatigue reliability assessment. Part II. Example of application . In Strojnícky časopis, 61, 2010, No. 4, p. 203-214. ISSN 0039-2472.

KLIMAN, Vladimír - KEPKA, Miroslav - VÁCLAVÍK, Jaroslav. Influence of scatter of cyclic properties of material on operational endurance of construction. In Kovové materiály, 48, 2010, p. 367-378. (2010 - Current Contents). ISSN 0023-432X. DOI: 10.4149/km_2010_6_367.

CHMELKO, Vladimír - KLIMAN, Vladimír - GARAN, Martin. In-time monitoring of fatigue damage. Ed. J. Papuga, M. Ružička. In Procedia Engineering : Special Issues, 2015, vol. 101, p. 93 - 100. ISSN 1877-7058.

KLIMAN, Vladimír - CHMELKO, Vladimír. - MARGETIN, Matúš. Analysis of the notch effect of welded joint and of grinding effect. In Kovové materiály, 53, 2015, p. 429-441. ISSN 0023-432X.