A fatigue damage accumulation model for reliability analysis of engine components under combined cycle loadings

Abstract

Rotor components of an aircraft engine in service are usually subjected to combined high and low cycle fatigue (CCF) loadings. In this work, combining with the load spectrum of CCF, a modified damage accumulation model for CCF life prediction of turbine blades is first put forward to take into account the effects of load consequence and load interaction caused by high‐cycle fatigue (HCF) loads and low‐cycle fatigue (LCF) loads under CCF loading conditions. The predicted results demonstrate that the proposed model presents a higher prediction accuracy than Miner, Manson‐Halford model does. Moreover, to evaluate the fatigue reliability of rotor components, reliability model with the failure mode of CCF is proposed on the basis of the stress‐strength interference method when considering the strength degeneration, and its results show that the reliability model with CCF is more suitable for aero‐engine components than that with the failure mode of single fatigue.

Prediction and evaluation of fatigue life via modified energy method considering surface processing

“…In order to evaluate the low cycle fatigue damage, the conservation energy model was proposed based on damage rate (Du et al, 2017), which was the product of plastic strain rate and damage force. Fatigue was a complex damage accumulation process Yue et al, 2020), which was characterized by microstructure evolution, strain localization, crack nucleation and growth at different length scales. And it can be considered as a continuous process of energy dissipation from an energetic perspective (Behera et al, 2019).…”

A Non-intrusive Global/Local Cycle-Jumping Techniques: Application to Visco-Plastic Structures

“…In order to precisely assess the lifespan of the structure, a damage criterion should be added as in [17]. The 2D example of Figure 1 is used in the paper.…”

Dynamic Reliability Analysis of Turbine Blades Under Combined High and Low Cycle Loadings

“…In this section, an explosive bolt is used to validate the proposed reliability model according to the previous work [19,20]. Some material parameters are given by 2 m = , In this analysis, the reliability by the proposed method with the ratio of high and low cycle stress frequency 100 and reliability based on LCF loading can be presented by using Eq (16), as shown in Figure 2.…”

“…For CCF loadings, the LCF load L s can be considered as the mean stress m s . Especially, the cumulative damage for N combined block application times can be obtained from the perspective of the CCF loads [19] ( ) ( ) ( )…”