A modified damage accumulation model for life prediction of aero‐engine materials under combined high and low cycle fatigue loading

2021 ◽  
Author(s):  
Song Bai ◽  
Hong‐Zhong Huang ◽  
Yan‐Feng Li ◽  
Aodi Yu ◽  
Zhiming Deng
Keyword(s):  
Life Prediction ◽  
Damage Accumulation ◽  
Low Cycle Fatigue ◽  
Fatigue Loading ◽  
Cycle Fatigue ◽  
Accumulation Model ◽  
Aero Engine ◽  
Damage Accumulation Model

Low Cycle Fatigue and Crack Grow in Powder Nickel Alloy under Turbine Disk Wave Form Loading: Validation of Damage Accumulation Model

2013 ◽  
Vol 467 ◽  
pp. 312-316 ◽  
Author(s):  
M. Nikhamkin ◽  
A. Ilinykh
Keyword(s):  
Crack Initiation ◽  
Damage Accumulation ◽  
Low Cycle Fatigue ◽  
Fatigue Crack Initiation ◽  
Wave Form ◽  
Cycle Fatigue ◽  
Accumulation Model ◽  
Cyclic Durability ◽  
Durability Prediction ◽  
Damage Accumulation Model

Experimental verification of the damage accumulation model of low cycle fatigue crack initiation and growth is executed. Loading wave form typical for discs of gas turbine engines is studied. Linear damage accumulation model is found to give acceptable accuracy for crack initiation and growth in powder nickel alloys. This model is acceptable for disc cyclic durability prediction.

scholarly journals A Modified Nonlinear Damage Accumulation Model for Fatigue Life Prediction Considering Load Interaction Effects

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Huiying Gao ◽  
Hong-Zhong Huang ◽  
Shun-Peng Zhu ◽  
Yan-Feng Li ◽  
Rong Yuan
Keyword(s):  
Experimental Data ◽  
Fatigue Life ◽  
Life Prediction ◽  
Damage Accumulation ◽  
Interaction Effects ◽  
Fatigue Life Prediction ◽  
Accumulation Model ◽  
Proposed Model ◽  
Fatigue Damage Accumulation ◽  
Damage Accumulation Model

Many structures are subjected to variable amplitude loading in engineering practice. The foundation of fatigue life prediction under variable amplitude loading is how to deal with the fatigue damage accumulation. A nonlinear fatigue damage accumulation model to consider the effects of load sequences was proposed in earlier literature, but the model cannot consider the load interaction effects, and sometimes it makes a major error. A modified nonlinear damage accumulation model is proposed in this paper to account for the load interaction effects. Experimental data of two metallic materials are used to validate the proposed model. The agreement between the model prediction and experimental data is observed, and the predictions by proposed model are more possibly in accordance with experimental data than that by primary model and Miner’s rule. Comparison between the predicted cumulative damage by the proposed model and an existing model shows that the proposed model predictions can meet the accuracy requirement of the engineering project and it can be used to predict the fatigue life of welded aluminum alloy joint of Electric Multiple Units (EMU); meanwhile, the accuracy of approximation can be obtained from the proposed model though more simple computing process and less material parameters calling for extensive testing than the existing model.

scholarly journals A General Damage Accumulation Model for Multiaxial, Proportional High Cycle Fatigue Loadings With Sines, Crossland and Dang Van Criteria

2019 ◽  
Vol 86 (12) ◽  
Author(s):  
Akbar Ghazavizadeh ◽  
Fodil Meraghni ◽  
Laurent Peltier ◽  
Nadine Bourgeois
Keyword(s):  
Differential Equation ◽  
Damage Accumulation ◽  
High Cycle Fatigue ◽  
Multiaxial Fatigue ◽  
Model Parameters ◽  
Cycle Fatigue ◽  
Damage Functions ◽  
Identification Scheme ◽  
Accumulation Model ◽  
Damage Accumulation Model

Abstract In this paper, a key differential equation is proposed to formulate fatigue damage evolution in metallic alloys under multiaxial, multiblock, proportional loadings in high cycle fatigue (HCF) and very high cycle fatigue (VHCF) regimes. This differential equation possesses two main components: one is a stress function to accommodate the adopted fatigue criterion and the other one is a characteristic damage function that serves to capture the HCF response of alloys. Two distinct characteristic damage functions with three different multiaxial fatigue criteria, namely Sines, Crossland, and Dang Van criteria, are examined to develop six (out of many possible) variants of the presented damage accumulation model. As a validation measure, Chaboche’s HCF damage model is retrieved as a specific case of the developed formalism. For model parameters identification, an ad hoc two-level identification scheme is designed and numerically verified. It is demonstrated that endurance limit, which is determined from fully reversed HCF tests (i.e., R = −1), can be identified from fatigue tests with positive stress ratio (R > 0), thus making our development quite suitable for specimens prone to buckling under compression. Another salient feature of the devised identification scheme is its capability in extracting model parameters from noisy data.

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