EVALUATION OF ULTRASONIC FATIGUE TESTING PROCESS OF HIGH STRENGTH STEEL BY NON-LINEAR ULTRASONIC ANALYSIS

2009 ◽  
Author(s):  
M. Shiwa ◽  
Y. Furaya ◽  
H. Yamawaki ◽  
K. Ito ◽  
M. Enoki ◽  
...  
Keyword(s):  
High Strength Steel ◽  
Fatigue Testing ◽  
High Strength ◽  
Non Linear ◽  
Ultrasonic Fatigue ◽  
Ultrasonic Analysis

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.

Fatigue in Ti-6Al-4V at Very High Cycles

2007 ◽  
Vol 561-565 ◽  
pp. 259-262 ◽  
Author(s):  
X.J. Cao ◽  
M.R. Sriraman ◽  
Qing Yuan Wang
Keyword(s):  
Fatigue Testing ◽  
Fatigue Behavior ◽  
Weight Ratio ◽  
High Strength ◽  
Ambient Air ◽  
Ti Alloys ◽  
Structural Applications ◽  
Ultrasonic Fatigue ◽  
Reversed Loading ◽  
Very High

The importance of determining and understanding the very high cycle fatigue behaviors of materials has gained strength in recent years. Ti-alloys, in view of their high strength-to-weight ratio, have a range of structural applications. Of these, Ti-6Al-4V, belonging to the alpha-beta type is the most widely used. The present paper deals with investigations on the fatigue behavior of TC4, the Chinese equivalent to Ti-6Al-4V, up to very high cycles. Fatigue testing was carried out on a piezoelectric ultrasonic fatigue machine operating at 20 kHz frequency. Hourglass shaped resonant specimens were tested in ambient air at room temperature under completely reversed loading conditions (R = -1). Failure in the alloy was seen to occur right up to the gigacycle regime, with the fractures being found to initiate from the surface unlike in steels. The fracture surfaces exhibit brittle characteristics containing river patterns and cleavage facets, as well as striations.

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

Influence of Loading Frequency on Fatigue Behavior of High Strength Steel

2007 ◽  
Vol 353-358 ◽  
pp. 227-230 ◽  
Author(s):  
Nu Yan ◽  
Qing Yuan Wang ◽  
Q. Chen ◽  
J.J. Sun
Keyword(s):  
High Strength Steel ◽  
Fatigue Behavior ◽  
High Strength ◽  
Fatigue Tests ◽  
Test Machine ◽  
Ultrasonic Frequency ◽  
Loading Frequency ◽  
Frequency Level ◽  
Ultrasonic Fatigue ◽  
Long Life

In order to investigate the influence of loading frequency on the fatigue behaviors of the high strength steel, ultrasonic fatigue tests were carried out for a high-carbon-chromium steel and the results were compared with those of fatigue tests using conventional rotary bending fatigue test machine with a frequency of 52.5Hz. The different of fatigue strength at ultrasonic frequency level and conventional frequency level is very small and the S-N curve obtained from 20 kHz or 52.5 Hz shows the step-wise shape. The fatigue crack occurred from inclusions on the subsurface site in the long life regime and the typical surface fracture occurred in the short life one though the loading frequency level is different. It is indicated that ultrasonic fatigue method is an effective method to investigate the fatigue properties in super-long life region.

scholarly journals Ultrasonic fatigue of a high strength steel

2010 ◽  
Vol 240 ◽  
pp. 012044 ◽  
Author(s):  
M Koster ◽  
G Wagner ◽  
D Eifler
Keyword(s):  
High Strength Steel ◽  
High Strength ◽  
Ultrasonic Fatigue
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