scholarly journals A fuzzy residual strength based fatigue life prediction method

2015 ◽  
Vol 56 (2) ◽  
pp. 201-221 ◽  
Author(s):  
Yi Zhang
Keyword(s):  
Fatigue Life ◽  
Residual Strength ◽  
Life Prediction ◽  
Prediction Method ◽  
Fatigue Life Prediction ◽  
Strength Based

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.

The Fatigue Life Prediction Method for Multi-Spot-Welded Structures

1993 ◽  
Author(s):  
Y. Rui ◽  
R. S. Borsos ◽  
R. Gopalakrishnan ◽  
H. N. Agrawal ◽  
C. Rivard
Keyword(s):  
Fatigue Life ◽  
Life Prediction ◽  
Prediction Method ◽  
Fatigue Life Prediction ◽  
Welded Structures ◽  
Spot Welded

An energy-based critical fatigue life prediction method for AL6061-T6

2012 ◽  
Vol 35 (9) ◽  
pp. 861-870 ◽  
Author(s):  
T. LETCHER ◽  
M.-H. H. SHEN ◽  
O. SCOTT-EMUAKPOR ◽  
T. GEORGE ◽  
C. CROSS
Keyword(s):  
Fatigue Life ◽  
Life Prediction ◽  
Prediction Method ◽  
Fatigue Life Prediction

A Robust Optimization Technique for Calculating Scaling Coefficients in an Energy-Based Fatigue Life Prediction Method

2012 ◽  
Author(s):  
Todd Letcher ◽  
John Wertz ◽  
M.-H. Herman Shen
Keyword(s):  
Fatigue Life ◽  
Robust Optimization ◽  
Life Prediction ◽  
Stress Amplitude ◽  
Optimization Technique ◽  
Hysteresis Loops ◽  
Prediction Method ◽  
Interval Uncertainty ◽  
Fatigue Life Prediction ◽  
Robust Design Optimization

The energy-based lifing method is based on the theory that the cumulative energy in all hysteresis loops of a specimens’ lifetime is equal to the energy in a monotonic tension test. Based on this theory, fatigue life can be calculated by dividing monotonic tensile energy by a hysteresis energy model, which is a function of stress amplitude. Due to variations in the empirically measured hysteresis loops and monotonic fracture area, fatigue life prediction with the energy-based method shows some variation as well. In order to account for these variations, a robust design optimization technique is employed. The robust optimization procedure uses an interval uncertainty technique, eliminating the need to know an exact probability density function for the uncertain parameters. The robust optimization framework ensures that the difference between the predicted lifetime at a given stress amplitude and the corresponding experimental fatigue data point is minimized and within a specified tolerance range while accounting for variations in hysteresis loop energy and fracture diameter measurements. Accounting for these experimental variations will boost confidence in the energy-based fatigue life prediction method despite a limited number of test specimens.

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