Fatigue Testing of Shrink-Fit Couplings for Joining High Strength Steel Riser Pipe

2013 ◽  
Author(s):  
John Shield ◽  
Jonathan Bowman ◽  
John Wightman ◽  
James Pappas
Keyword(s):  
High Strength Steel ◽  
Fatigue Testing ◽  
High Strength ◽  
Riser Pipe ◽  
Shrink Fit

scholarly journals Low-cycle fatigue behaviour of laser welded high-strength steel DOMEX 700 MC

2018 ◽  
Vol 157 ◽  
pp. 05013 ◽  
Author(s):  
Peter Kopas ◽  
Milan Sága ◽  
František Nový ◽  
Bohuš Leitner
Keyword(s):  
Fatigue Life ◽  
Welded Joints ◽  
High Strength Steel ◽  
Fatigue Testing ◽  
Low Cycle Fatigue ◽  
High Strength ◽  
Fatigue Behaviour ◽  
Total Strain Amplitude ◽  
Cycle Fatigue ◽  
Fatigue Life Analysis

The article presents the results of research on low cycle fatigue strength of laser welded joints vs. non-welded material of high-strength steel DOMEX 700 MC. The tests were performed under load controlled using the total strain amplitude ɛac. The operating principle of the special electro-mechanic fatigue testing equipment with a suitable clamping system was working on 35 Hz frequency. Fatigue life analysis was conducted based on the Manson-Coffin-Basquin equation, which made it possible to determine fatigue parameters. Studies have shown differences in the fatigue life of original specimens and laser welded joints analysed, where laser welded joints showed lower fatigue resistance. In this article a numerical analysis of stresses generated in bending fatigue specimens has been performed employing the commercially available FEM-program ADINA.

scholarly journals Fatigue Process Evaluation of Ultrasonic Fatigue Testing in High Strength Steel Analyzed by Acoustic Emission and Non-Linear Ultrasonic

2010 ◽  
Vol 51 (8) ◽  
pp. 1404-1408 ◽  
Author(s):  
Mitsuharu Shiwa ◽  
Yoshiyuki Furuya ◽  
Hisashi Yamawaki ◽  
Kaita Ito ◽  
Manabu Enoki
Keyword(s):  
Acoustic Emission ◽  
Process Evaluation ◽  
High Strength Steel ◽  
Fatigue Testing ◽  
High Strength ◽  
Fatigue Process ◽  
Non Linear ◽  
Ultrasonic Fatigue

Very High Cycle Fatigue Behavior and Thermographic Analysis of High Strength Steel

2010 ◽  
Vol 118-120 ◽  
pp. 948-951
Author(s):  
Chuang Shao ◽  
Claude Bathias ◽  
Danièle Wagner ◽  
Hua Tao
Keyword(s):  
Crack Initiation ◽  
High Strength Steel ◽  
High Cycle Fatigue ◽  
Fatigue Testing ◽  
Fatigue Behavior ◽  
High Strength ◽  
Cycle Fatigue ◽  
Subsurface Crack ◽  
Very High Cycle Fatigue ◽  
Very High

Very high cycle fatigue behavior of high strength steel, were investigated using ultrasonic fatigue testing equipment at 20 kHz up to 109cycles. S-N curves at room temperature with different stress ratio (R=0.01 and R=0.1) was determined. The experimental results show that fatigue strength decrease with increasing number of cycles between 105 and 109. SEM examination of fracture surface reveals that fatigue damage was governed by the formation of cracks, and subsurface crack initiation was in the very long life range. The results shown that the portions of life attributed to subsurface crack initiation between 107 and 109 cycles are 99%.

Fracture Mechanics Analysis of a High Strength Steel for Offshore Application

2002 ◽  
Author(s):  
Arild Lundberg ◽  
Ba˚rd Nyhus ◽  
Oddvin O̸rjasæter
Keyword(s):  
Fatigue Life ◽  
Fracture Mechanics ◽  
High Strength Steel ◽  
Fatigue Testing ◽  
Base Material ◽  
High Strength ◽  
Contact Forces ◽  
Coarse Grained ◽  
Circumferential Welds ◽  
Mechanics Analysis

One of the main bearing elements of the Siri jack-up is three tubular legs; outside diameter 3.5m and an overall length of 104m. The main material grade is high strength steel with SMYS≥690MPa. This strength was required due to contact forces during the jacking phase. One of the major issues concerning integrity of the platform was associated with the fatigue life of the legs. The fatigue life of the legs WAS to be 60 years for inaccessible locations, 40 years for accessible submerged locations and 20 years for accessible dry locations. To achieve the required fatigue lives, wall thickness of 65mm, 75mm and 90mm were utilized for the 690 steel. Furthermore, to meet the 40-year requirement, lives for the lower circumferential welds were designed to Class C, i.e. they needed to be improved by grinding. Based on performed research, it was aimed at minimum CTOD values of 0.20mm and 0.25mm in the PWHT and AW conditions respectively. Although the aim was achieved for the base material and sub critical HAZ, the weld metal and the coarse grained HAZ values were significantly below these values, i.e. 0.12mm and 0.02mm respectively. In order to verify the integrity of the platform a fracture mechanics analysis was performed. The assessment comprised evaluation of critical defect sizes and fatigue life calculations using PD6493. Wide plate testing, residual stress measurements and fatigue testing have been performed. The assessment showed that the integrity of the platform was maintained. In order to obtain additional safety an inspection program for the critical welds has been implemented in the operational phase.

scholarly journals Fatigue Testing Equipment and Fatigue Property of a High Strength Steel in Petrol Environment

2021 ◽  
Vol 70 (12) ◽  
pp. 905-911
Author(s):  
Yuuki KASAMUTA ◽  
Masaki WATANABE ◽  
Taiki SUGIMOTO ◽  
Yuuya KIMURA ◽  
Fumio OGAWA ◽  
...  
Keyword(s):  
High Strength Steel ◽  
Fatigue Testing ◽  
Fatigue Property ◽  
High Strength ◽  
Testing Equipment
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