Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 3

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: cumulative fatigue damage

Sortuj według:

Ogranicz wyniki do:

Nonlinear Fatigue Damage Accumulation

Dębski D. K.

Fatigue of Aircraft Structures

2015

Iss. 7

18--23

One important element of any computational fatigue analysis is the adoption of a hypothesis of fatigue damage accumulation. The most commonly used is the hypothesis of linear accumulation of fatigue damage called the Palmgren-Miner hypothesis. This linear hypothesis does not take into account a factor of great importance: the mutual influence of consecutive fatigue load sequences on each other. In the presented paper, only two consecutive load sequences linked by mutual relations have been analyzed and the results of the analysis have been shown. A more complex form which takes into account the full load history would create complex formula difficult to use. Perhaps, we should go in this direction, especially that today we have enormous computing power at our disposal.

Evolution of tensile properties of the TiAl6V4 alloy due to the prior cyclic loading history

Moćko W., Kowalewski Z. L.

Journal of Theoretical and Applied Mechanics

2014

Vol. 52 nr 3

847--851

The influence of the initial fatigue loading on tensile characteristics of the TiAl6V4 titanium alloy is presented in this work. For cumulative fatigue damage equal to 0.75, a decrease in the pre-fatigue amplitude leads to a lowering in the elongation. Moreover, independent of the amplitude, the loading induces an increase in the yield stress by approximately 100MPa. An increase in the number of pre-fatigue cycles at a constant amplitude results in a decrease in the elongation. Such mechanical behaviour is related to the cyclic hardening effect and the development of fatigue damage, which clearly affects the tensile characteristics of the alloy.

The Influence of Mean Strain Under Two-Step High-Low Loading on Cumulative Fatigue Damage in St5 Steel

Gołoś K., Dębski D.

Machine Dynamics Research

2013

Vol. 37, No. 4

35-41

In the paper results of a comparison analysis of cumulative fatigue damage in St5 steel under two-step high-low loading including mean strain were presented. The analysis was carried out with the modified energy based damaged parameter including mean strain. The analysis showed that additional mean strain affects the cumulative damage in two-step loading and generally decreases the fatigue life comparing to tests without mean strain. It is shown that during damage cumulation is possible using proposed damage parameter to take into account the effect of mean strain.