Abstract
The authors of this paper, based on their own results, discuss fatigue properties of low-alloyed fine-grained steel STRENX 700MC obtained in the ultra-high-cycle region (gigacycle fatigue) with regard to the reliability and safety of structural elements. According to obtained data it is obvious that fatigue strength continuously decreases with increasing number of cycles to failure (in a range from N = 10(7) to N = 10(10) cycles). Fatigue limit σc determined usually at N = 2 Ă 10(6) / 10(7) cycles does not meet the requirements of reliability and safety of structural elements. Design of structural elements which will be working in the ultra-high-cycle fatigue region requires complete information about fatigue behavior of used structural materials.
Highlights
Fatigue lifetime of structural elements has been investigated for more than 170 years
The strain or stress vs. number of cycles plot (S - N, σa = f (N) dependence) including conventional fatigue limit σc usually referred to N = 2 × 106 ÷ 107 cycles are the main parameters used for evaluation of fatigue properties of structural materials [1,2,3]
In this paper the authors provide their own results followed by a discussion about fatigue properties of low-alloyed fine-grained structural steel STRENX 700MC with reference to the reliability and safety of structural elements
Summary
Fatigue lifetime of structural elements has been investigated for more than 170 years. The new design solutions are connected with the proper selection of materials for individual structural elements This fact is crucial from the point of view of their reliability and safety and has a huge contribution to increasing their service life. With the aim to prolong the service life of structural elements, the ultralong fatigue life (107 < N < 1010 cycles) has, been studied very intensively during recent years [1, 4 and 5]. This reality is emphasized by the fact that fatigue fractures are observed after billion cycles of loading and more. In this paper the authors provide their own results followed by a discussion about fatigue properties of low-alloyed fine-grained structural steel STRENX 700MC with reference to the reliability and safety of structural elements
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