Effect of local equivalent stress on fatigue life prediction of carburized Cr-Ni alloy steel based on evaluation of maximum crack sizes

2021 ◽  
pp. 107718
Author(s):  
H.-L. Deng ◽  
B. Liu ◽  
Y. Guo ◽  
Y.-P. Guo ◽  
H. Yu
Keyword(s):  
Fatigue Life ◽  
Alloy Steel ◽  
Life Prediction ◽  
Equivalent Stress ◽  
Fatigue Life Prediction ◽  
Ni Alloy ◽  
Local Equivalent ◽  
Maximum Crack

A new distortion energy-based equivalent stress for multiaxial fatigue life prediction

2012 ◽  
Vol 47 (3) ◽  
pp. 29-37 ◽  
Author(s):  
Onome Scott-Emuakpor ◽  
Tommy George ◽  
Charles Cross ◽  
John Wertz ◽  
M.-H. Herman Shen
Keyword(s):  
Fatigue Life ◽  
Life Prediction ◽  
Equivalent Stress ◽  
Multiaxial Fatigue ◽  
Fatigue Life Prediction ◽  
Distortion Energy

scholarly journals Research on the Fatigue Life Prediction Method of Thrust Rod

2016 ◽  
Vol 2016 ◽  
pp. 1-9
Author(s):  
Guoyu Feng ◽  
Wenku Shi ◽  
Henghai Zhang ◽  
Qinghua Zu ◽  
Teng Teng ◽  
...  
Keyword(s):  
Finite Element ◽  
Fatigue Life ◽  
Fatigue Damage ◽  
Life Prediction ◽  
Damage Mechanics ◽  
Equivalent Stress ◽  
Prediction Method ◽  
Fatigue Life Prediction ◽  
Model Parameters ◽  
Element Analysis

Purpose of this paper is to investigate the fatigue life prediction method of the thrust rod based on the continuum damage mechanics. The equivalent stress used as damage parameters established rubber fatigue life prediction model. Through the finite element simulation and material test, the model parameters and the fatigue damage dangerous positions were obtained. By equivalent stress life model, uniaxial fatigue life of the V-type thrust rod is analyzed to predict the ratio of life and the life of the test was 1.73, within an acceptable range, and the fatigue damage occurring position and finite element analysis are basically the same. Fatigue life analysis shows that the method is of correct, theoretical, and practical value.

scholarly journals Establishment and Verification of Multiaxis Fatigue Life Prediction Model

Scanning ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-6
Author(s):  
Zhuo Fu ◽  
Xiang Li ◽  
Sha Zhang ◽  
Hanqing Xiong ◽  
Chi Liu ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Prediction Model ◽  
Life Prediction ◽  
Equivalent Stress ◽  
High Strength ◽  
Fatigue Life Prediction ◽  
Critical Surface ◽  
Finite Element Software ◽  
Aluminum Alloy 7075 ◽  
Life Prediction Model

A fatigue life prediction model with multiaxis load is proposed. The model introduces a new effective cyclic parameter, equivalent stress on the critical surface, to modify the Suntech model. The new damage parameters are not related to empirical constants, hence more applicable for practical application in engineering. The multiaxis fatigue test was carried out with high-strength aluminum alloy 7075-T651, and the multiaxis fatigue life prediction of the test piece was conducted with the finite element software. The experiment result shows that the model proposed is effective for predicting the fatigue life under multiaxis load.

scholarly journals Fatigue life prediction under mixed-mode loading using equivalent stress intensity factor models

2018 ◽  
Vol 172 ◽  
pp. 03005 ◽  
Author(s):  
S. Sajith ◽  
K.S.R. K. Murthy ◽  
P.S. Robi
Keyword(s):  
Stress Intensity Factor ◽  
Fatigue Crack ◽  
Fatigue Life ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Mixed Mode ◽  
Life Prediction ◽  
Damage Tolerance ◽  
Equivalent Stress ◽  
Fatigue Life Prediction

Damage tolerance principles are widely used to assess the structural integrity and failure of engineering components. The advances in numerical simulation techniques facilitate the prediction of fatigue life of engineering component, which is essential in damage tolerance design. For the components under mixed mode (I/II) loading, the fatigue crack growth and life is predicted by using a modified form of Paris' law along with the equivalent stress intensity factor (ΔKeq). Numerous ΔKeq models are available for correlating the equivalent stress intensity factor range and the fatigue crack growth rate. The knowledge of proper ΔKeq model is essential for the accurate fatigue life estimation. In this work, the authors numerically assess the performance of ΔKeq models in mixed mode fatigue life prediction with the help of published experimental mixed mode data.

A New Energy-Based Multiaxial Fatigue Life Prediction Procedure

2008 ◽  
Author(s):  
Wasim Tarar ◽  
Onome Scott-Emuakpor ◽  
M.-H. Herman Shen ◽  
Tommy George ◽  
Charles Cross
Keyword(s):  
Finite Element ◽  
Fatigue Life ◽  
Life Prediction ◽  
Equivalent Stress ◽  
Multiaxial Fatigue ◽  
Constitutive Law ◽  
Fatigue Life Prediction ◽  
Element Analysis ◽  
Number Of Cycles ◽  
Cycles To Failure

An energy-based fatigue life prediction framework was previously developed by the authors for prediction of axial and bending fatigue life at various stress ratios. The framework for the prediction of fatigue life via energy analysis was based on a new constitutive law, which states the following: the amount of energy required to fracture a material is constant. In this study, energy expressions that construct the constitutive law are equated in the form of total strain energy and the distortion energy dissipated in a fatigue cycle. The resulting equation is further evaluated to acquire the equivalent stress per cycle using energy based methodologies. The equivalent stress expressions are developed both for biaxial and multiaxial fatigue loads and are used to predict the number of cycles to failure based on previously developed prediction criterion. The equivalent stress expressions developed in this study are further used in a new finite element procedure to predict the fatigue life for two and three dimensional structures. The final output of this finite element analysis is in the form of number of cycles to failure for each element on a scale in ascending or descending order. Therefore, the new finite element framework can provide the number of cycles to failure at each location in gas turbine engine structural components. In order to obtain experimental data for comparison, an Al6061-T6 plate is tested using a previously developed vibration based testing framework. The finite element analysis is performed for Al6061-T6 aluminum and the results are compared with experimental results.

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