Fatigue strength of heat resistant alloys in relation to stress concentration, cycle asymmetry, and surface cold working

1974 ◽  
Vol 6 (4) ◽  
pp. 481-485
Author(s):  
B. F. Balashov ◽  
A. N. Petukhov
Keyword(s):  
Fatigue Strength ◽  
Stress Concentration ◽  
Cold Working ◽  
Cycle Asymmetry ◽  
Heat Resistant

Effect of stress concentration on fatigue strength of heat-resistant nickel alloys

1984 ◽  
Vol 16 (5) ◽  
pp. 617-621
Author(s):  
M. S. Belyaev ◽  
N. D. Zhukov
Keyword(s):  
Fatigue Strength ◽  
Stress Concentration ◽  
Nickel Alloys ◽  
Heat Resistant

Effect of loading frequency, temperature, and cycle asymmetry on the endurance of heat-resistant steels 1Kh2m and Kh18N9. Part 1

1980 ◽  
Vol 12 (4) ◽  
pp. 439-444 ◽  
Author(s):  
V. A. Kuz'menko ◽  
I. I. Ishchenko ◽  
I. A. Troyan ◽  
S. V. Grishakov ◽  
L. E. Matokhnyuk ◽  
...  
Keyword(s):  
Loading Frequency ◽  
Cycle Asymmetry ◽  
Heat Resistant ◽  
Heat Resistant Steels ◽  
Frequency Temperature

Pipe Joint Management for Risers and Pipelines

2021 ◽  
Author(s):  
Ghiath (Guy) Mansour
Keyword(s):  
Fatigue Strength ◽  
Stress Concentration ◽  
Software Development ◽  
Wall Thickness ◽  
Stress Concentration Factor ◽  
Concentration Factor ◽  
Joint Management ◽  
Pipe Joints ◽  
Best Fit ◽  
Pipe Joint

Abstract Minimizing the stress concentration factor (SCF) in pipe joint welding subjected to fatigue is a major concern. Machining the joint ends is one way to achieve this. However, this adds cost, time, risk of potential crack starters, and loss of wall thickness which is detrimental for fatigue, strength, and engineering criticality assessment (ECA) in particular. Pipe joint sorting (certain joints in sequence) and end matching (rotating the pipe joints for best fit) are other ways. However, this adds time, costly logistics, risk of errors, and does not guarantee the minimum possible SCF is achieved. In a typical project, more pipe joints are procured than required in order to mitigate contingencies. For pipelines, this overage is typically a percentage of the required number of joints or pipeline length. For risers, typically double the required number of joints is procured where half of the joints is sent offshore for installation and the remaining half is kept onshore for a spare riser. Then, it becomes very important to send for installation the best pipe joints that produce the best (lowest) SCFs out of the entire batch of pipe joints. This requires calculating the SCF for every potential match of any random joints to be welded together, and then choosing the best joints. Performing such calculations by spreadsheet is not feasible considering the tremendous number of required iterations and calculations. A pipe joint management software development is presented herein which accomplishes this task and examples provided to illustrate the benefits. Note: Selecting pipe joints with the best end measurements, whether ID, OD, OOR, or thickness does not guarantee that the minimum possible SCFs will be achieved since the SCF is a function of all those measurements.

Influence of Stress Concentration on Fatigue Property of Welded Joints of 5083 Aluminum Alloy

2013 ◽  
Vol 456 ◽  
pp. 451-455
Author(s):  
Jun Yang ◽  
Bo Li ◽  
Qiang Jia ◽  
Yuan Xing Li ◽  
Ming Yue Zhang ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Aluminum Alloy ◽  
Fatigue Strength ◽  
Stress Concentration ◽  
Welded Joints ◽  
Weld Zone ◽  
Fatigue Property ◽  
Concentration Coefficient ◽  
5083 Aluminum Alloy ◽  
Stress Concentration Coefficient

Fatigue test of the welded joint of 5083 aluminum alloy with smooth and height of specimen and the weld zone than the high test measurement and theoretical stress concentration coefficient calculation, the weld reinforcement effect of stress concentration on the fatigue performance of welded joints. The results show that: Smooth tensile strength of specimens for 264MPa, fatigue strength is 95MPa, the tensile strength of the 36%. Higher tensile strength of specimens for 320MPa, fatigue strength is 70MPa, the tensile strength of the 22%. Higher specimen stress concentration coefficient is 1.64, the stress concentration to the weld toe becomes fatigue initiation source, and reduces the fatigue strength and the fatigue life of welded joints.

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