Fatigue life prediction model of metallic materials considering crack propagation and closure effect

2020 ◽  
Vol 42 (8) ◽  
Author(s):  
Que Wu ◽  
Xintian Liu ◽  
Zhiqiang Liang ◽  
Yansong Wang ◽  
Xiaolan Wang
Keyword(s):  
Fatigue Life ◽  
Crack Propagation ◽  
Prediction Model ◽  
Life Prediction ◽  
Fatigue Life Prediction ◽  
Metallic Materials ◽  
Closure Effect ◽  
Life Prediction Model

A Multi-Axial Fatigue Limit Prediction Equation for Metallic Materials

2020 ◽  
Vol 142 (3) ◽  
Author(s):  
Bowen Liu ◽  
Xiangqiao Yan
Keyword(s):  
Fatigue Life ◽  
Prediction Model ◽  
Fatigue Limit ◽  
Life Prediction ◽  
Prediction Equation ◽  
Fatigue Life Prediction ◽  
Stress Effect ◽  
Metallic Materials ◽  
Life Prediction Model ◽  
Axial Fatigue

Abstract Based on the multi-axial fatigue life prediction model presented recently by the authors, in this note, a fatigue limit prediction equation for metallic materials under multi-axial loading is proposed. In the multi-axial fatigue life prediction model, the wildly used von Mises equivalent stress is taken as an equivalent fatigue mechanical quantity, and the multi-axial fatigue life prediction equation has the invariance of mathematical equation form. By applying the multi-axial fatigue life prediction equation without mean stress effect to fatigue limit case, a simple fatigue limit prediction equation can be obtained. By using a large number of experimental data of metallic materials reported in literature, it has been proven that the fatigue limit prediction equation is not only simple in computation but also high in accuracy.

Fatigue Life Prediction of Buckling String with Cracks in Horizontal Wells of Mining Engineering

2012 ◽  
Vol 577 ◽  
pp. 127-131 ◽  
Author(s):  
Peng Wang ◽  
Tie Yan ◽  
Xue Liang Bi ◽  
Shi Hui Sun
Keyword(s):  
Fatigue Life ◽  
Prediction Model ◽  
Life Prediction ◽  
Horizontal Well ◽  
Drill Pipe ◽  
Prediction Method ◽  
Drill String ◽  
Fatigue Life Prediction ◽  
Mining Engineering ◽  
Life Prediction Model

Fatigue damage in the rotating drill pipe in the horizontal well of mining engineering is usually resulted from cyclic bending stresses caused by the rotation of the pipe especially when it is passing through curved sections or horizontal sections. This paper studies fatigue life prediction method of rotating drill pipe which is considering initial crack in horizontal well of mining engineering. Forman fatigue life prediction model which considering stress ratio is used to predict drill string fatigue life and the corresponding software has been written. The program can be used to calculate the stress of down hole assembly, can predict stress and alternating load in the process of rotating-on bottom. Therefore, establishing buckling string fatigue life prediction model with cracks can be a good reference to both operation and monitor of the drill pipe for mining engineering.

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