scholarly journals Research on the Scope of Spectral Width Parameter of Frequency Domain Methods in Random Fatigue

2020 ◽  
Vol 10 (14) ◽  
pp. 4715
Author(s):  
Jie Xu ◽  
Yaolei Zhang ◽  
Qinghua Han ◽  
Jia Li ◽  
Giuseppe Lacidogna
Keyword(s):  
Fatigue Life ◽  
Frequency Domain ◽  
Life Prediction ◽  
Prediction Models ◽  
Spectral Width ◽  
Frequency Domain Method ◽  
Current Frequency ◽  
Frequency Domain Methods ◽  
Vibration Simulation ◽  
Random Fatigue

In the current fatigue life calculation theory, the most commonly used method is the frequency domain method. However, most of the frequency domain fatigue life prediction models do not indicate the scope of the application of the spectral width parameter. Different frequency domain methods have strict applicability to the spectral width parameter, and improper model selection will lead significant error. Therefore, it is particularly important to determine the scope of application of the spectral width parameter for different frequency-domain methods. This paper firstly introduces the current frequency domain methods, then simulates the analogue spectrum and selects three materials for comparison in the different frequency-domain methods. By analyzing and comparing the results of random fatigue life and relative error results, the application of different frequency-domain methods is obtained, and random vibration simulation verification is carried out with the practical engineering example, which can provide a reference for the selection of life prediction models.

A new frequency domain method for random fatigue life estimation in a wide-band stationary Gaussian random process

2018 ◽  
Vol 42 (1) ◽  
pp. 97-113 ◽  
Author(s):  
Qinghua Han ◽  
Jia Li ◽  
Jie Xu ◽  
Fei Ye ◽  
Alberto Carpinteri ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Random Process ◽  
Frequency Domain ◽  
Wide Band ◽  
Frequency Domain Method ◽  
Gaussian Random Process ◽  
Life Estimation ◽  
Domain Method ◽  
Fatigue Life Estimation ◽  
Random Fatigue

Testing and assessment of fatigue life prediction models for Indian PHWRs piping material under multi-axial load cycling

2016 ◽  
Vol 85 ◽  
pp. 98-113 ◽  
Author(s):  
Punit Arora ◽  
Suneel K. Gupta ◽  
V. Bhasin ◽  
R.K. Singh ◽  
S. Sivaprasad ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Axial Load ◽  
Life Prediction ◽  
Prediction Models ◽  
Fatigue Life Prediction ◽  
Load Cycling

LOW CYCLE FATIGUE BEHAVIOR AND LIFE PREDICTION OF A CAST COBALT-BASED SUPERALLOY

2012 ◽  
Vol 06 ◽  
pp. 251-256
Author(s):  
HO-YOUNG YANG ◽  
JAE-HOON KIM ◽  
KEUN-BONG YOO
Keyword(s):  
Fatigue Life ◽  
Strain Energy ◽  
Life Prediction ◽  
Prediction Models ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Total Strain ◽  
Cycle Fatigue ◽  
Total Strain Range ◽  
Different Temperatures

Co -base superalloys have been applied in the stationary components of gas turbine owing to their excellent high temperature properties. Low cycle fatigue data on ECY-768 reported in a companion paper were used to evaluate fatigue life prediction models. In this study, low cycle fatigue tests are performed as the variables of total strain range and temperatures. The relations between plastic and total strain energy densities and number of cycles to failure are examined in order to predict the low cycle fatigue life of Cobalt-based super alloy at different temperatures. The fatigue lives is evaluated using predicted by Coffin-Manson method and strain energy methods is compared with the measured fatigue lives at different temperatures. The microstructure observing was performed for how affect able to low-cycle fatigue life by increasing the temperature.

scholarly journals Fatigue Life Prediction of Rolling Bearings Based on Modified SWT Mean Stress Correction

2020 ◽  
Author(s):  
Aodi Yu ◽  
Hong-Zhong Huang ◽  
Yan-Feng Li ◽  
He Li ◽  
Ying Zeng
Keyword(s):  
Fatigue Life ◽  
Life Prediction ◽  
Stress Ratio ◽  
Prediction Models ◽  
Great Influence ◽  
Sensitivity Coefficient ◽  
Model Verification ◽  
Mean Stress ◽  
Test Results ◽  
Rolling Bearings

Abstract Mean stress has a great influence on fatigue life, commonly used stress-based life prediction models can only fit the test results of fatigue life under specific stress ratio or mean stress but cannot describe the effect of stress ratio or mean stress on fatigue life. Smith, Watson and Topper (SWT) proposed a simple mean stress correction criterion. However, the SWT model regards the sensitivity coefficient of all materials to mean stress as 0.5, which will lead to inaccurate predictions for materials with a sensitivity coefficient not equal to 0.5. In this paper, considering the sensitivity of different materials to mean stresses, compensation factor is introduced to modify the SWT model, and several sets of experimental data are used for model verification. Then, the proposed model is applied to fatigue life predictions of rolling bearings, and the results of proposed method are compared with test results to verify its accuracy.

Fatigue Life Prediction Models

2011 ◽  
pp. 49-63
Author(s):  
John Hock Lye Pang
Keyword(s):  
Fatigue Life ◽  
Life Prediction ◽  
Prediction Models ◽  
Fatigue Life Prediction

Review on fatigue life prediction models of welded joint

2020 ◽  
Vol 36 (3) ◽  
pp. 701-726 ◽  
Author(s):  
Guozheng Kang ◽  
Huiliang Luo
Keyword(s):  
Fatigue Life ◽  
Life Prediction ◽  
Prediction Models ◽  
Welded Joint ◽  
Fatigue Life Prediction

Development of generic creep–fatigue life prediction models

2004 ◽  
Vol 25 (4) ◽  
pp. 277-288 ◽  
Author(s):  
Tarun Goswami
Keyword(s):  
Fatigue Life ◽  
Life Prediction ◽  
Prediction Models ◽  
Fatigue Life Prediction ◽  
Creep Fatigue

Non-Linear Time and Frequency Domain Methods for Multi-Row Aeromechanical Analysis

2012 ◽  
Author(s):  
M. T. Rahmati ◽  
L. He ◽  
D. X. Wang ◽  
Y. S. Li ◽  
R. G. Wells ◽  
...  
Keyword(s):  
Frequency Domain ◽  
Time Domain ◽  
Computational Models ◽  
Linear Time ◽  
Navier Stokes ◽  
Frequency Domain Method ◽  
Domain Method ◽  
Frequency Domain Methods ◽  
Blade Row ◽  
Nonlinear Time Domain

An unsteady Navier-Stokes solution system for aeromechanical analysis of multiple blade row configurations is presented. A distinctive feature of the solver is that unified numerical methods and boundary condition treatments are consistently used for both a nonlinear time-domain solution mode and a frequency-domain one. This not only enables a wider range of physical aeromechanical problems to be tackled, but also provides a consistent basis for validating different computational models, identifying and understanding their relative merits and adequate working ranges. An emphasis of the present work is on a highly efficient frequency-domain method for multi-row aeromechanic analysis. With a new interface treatment, propagations and reflections of pressure waves between adjacent blade rows are modeled within a domain consisting of only a single passage in each blade row. The computational model and methods are firstly described. Then, extensive validations of the frequency-domain method against both experimental data and the nonlinear time-domain solutions are described. Finally the computational analysis and demonstration of the intra-row reflection effects on the rotor aerodynamic damping are presented.

Sign in / Sign up

Export Citation Format

Share Document