Fatigue Life Assessment for NPS30 Steel Pipe

2012 ◽  
Author(s):  
Jorge Silva ◽  
Hossein Ghaednia ◽  
Sreekanta Das
Keyword(s):  
Fatigue Life ◽  
Test Data ◽  
Crack Depth ◽  
Research Work ◽  
Longitudinal Crack ◽  
Assessment Model ◽  
Life Assessment ◽  
Fatigue Life Assessment ◽  
Remaining Fatigue Life ◽  
Crack Defect

Pipeline is the common mode for transporting oil, gas, and various petroleum products. Aging and corrosive environment may lead to formation of various defects such as crack, dent, gouge, and corrosion. The performance evaluation of field pipelines with crack defect is important. Accurate assessment of crack depth and remaining fatigue life of pipelines with crack defect is vital for pipeline’s structural integrity, inspection interval, management, and maintenance. An experimental based research work was completed at the University of Windsor for developing a semi-empirical model for estimating the remaining fatigue life of oil and gas pipes when a longitudinal crack defect has formed. A statistical approach in conjunction with fracture mechanics was used to develop this model. Statistical analysis was undertaken on CT specimen data to develop this fatigue life assessment model. Finite element method was used for determining the stress intensity factor. The fatigue life assessment model was then validated using full-scale fatigue test data obtained from 762 mm (30 inch) diameter X65 pipe. This paper discusses the test specimens and test data obtained from this study. Development and validation of the fatigue life assessment model is also presented in this paper.

Pre-crack fatigue life assessment of relevant aircraft materials using fractal analysis of eddy current test data

2013 ◽  
Author(s):  
Jürgen Schreiber ◽  
Ulana Cikalova ◽  
Susanne Hillmann ◽  
Norbert Meyendorf ◽  
Jochen Hoffmann
Keyword(s):  
Fatigue Life ◽  
Test Data ◽  
Eddy Current ◽  
Fractal Analysis ◽  
Life Assessment ◽  
Eddy Current Test ◽  
Current Test ◽  
Fatigue Life Assessment

Micro-Damage Evaluation and Remaining Fatigue Life Assessment with Nonlinear Vibro-Modulation Technique

2008 ◽  
Author(s):  
Dimitri Donskoy ◽  
Alexander Chudnovsky ◽  
Andrei Zagrai ◽  
Edward Golovin ◽  
Bengt Enflo ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Life Assessment ◽  
Damage Evaluation ◽  
Modulation Technique ◽  
Fatigue Life Assessment ◽  
Remaining Fatigue Life

Remaining fatigue life assessment of aging fixed steel offshore jacket platforms

2015 ◽  
Vol 12 (2) ◽  
pp. 223-238 ◽  
Author(s):  
Mostafa Zeinoddini ◽  
Pooya Ranjbar ◽  
Hadi Khalili ◽  
Alireza Ranaei ◽  
Hamid Golpour ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Life Assessment ◽  
Fatigue Life Assessment ◽  
Remaining Fatigue Life

scholarly journals A State-of-the-Art Review on Fatigue Life Assessment of Steel Bridges

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
X. W. Ye ◽  
Y. H. Su ◽  
J. P. Han
Keyword(s):  
Fatigue Life ◽  
Fatigue Damage ◽  
Condition Assessment ◽  
Steel Bridges ◽  
Probabilistic Methods ◽  
Life Assessment ◽  
Current Status ◽  
Fatigue Life Assessment ◽  
Remaining Fatigue Life ◽  
Unsolved Issue

Fatigue is among the most critical forms of damage potentially occurring in steel bridges, while accurate assessment or prediction of the fatigue damage status as well as the remaining fatigue life of steel bridges is still a challenging and unsolved issue. There have been numerous investigations on the fatigue damage evaluation and life prediction of steel bridges by use of deterministic or probabilistic methods. The purpose of this review is devoted to presenting a summary on the development history and current status of fatigue condition assessment of steel bridges, containing basic aspects of fatigue, classical fatigue analysis methods, data-driven fatigue life assessment, and reliability-based fatigue condition assessment.

scholarly journals Unified Principal S–N Equation for Friction Stir Welding of 5083 and 6061 Aluminum Alloys

2021 ◽  
Vol 34 (1) ◽  
Author(s):  
Xiangwei Li ◽  
Ji Fang ◽  
Xiaoli Guan
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Life ◽  
Friction Stir Welding ◽  
Test Data ◽  
Fatigue Tests ◽  
Life Assessment ◽  
Test Results ◽  
Friction Stir ◽  
Fatigue Life Assessment ◽  
Curve Equation

AbstractWith the popularization of friction stir welding (FSW), 5083-H321 and 6061-T6 aluminum alloy materials are widely used during the FSW process. In this study, the fatigue life of friction stir welding with two materials, i.e., 5083-H321 and 6061-T6 aluminum alloy, are studied. Fatigue tests were carried out on the base metal of these two materials as well as on the butt joints and overlapping FSW samples. The principle of the equivalent structural stress method is used to analyze the FSW test data of these two materials. The fatigue resistances of these two materials were compared and a unified principal S–N curve equation was fitted. Two key parameters of the unified principal S–N curve obtained by fitting, Cd is 4222.5, and h is 0.2693. A new method for an FSW fatigue life assessment was developed in this study and can be used to calculate the fatigue life of different welding forms with a single S–N curve. Two main fatigue tests of bending and tension were used to verify the unified principal S–N curve equation. The results show that the fatigue life calculated by the unified mean 50% master S–N curve parameters are the closest to the fatigue test results. The reliability, practicability, and generality of the master S–N curve fitting parameters were verified using the test data. The unified principal S–N curve acquired in this study can not only be used in aluminum alloy materials but can also be applied to other materials.

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