Fatigue crack growth rate test using a frequency sweep method

2008 ◽  
Vol 9 (3) ◽  
pp. 346-350 ◽  
Author(s):  
Xun Zhou ◽  
Xiao-li Yu
Keyword(s):  
Growth Rate ◽  
Fatigue Crack ◽  
Crack Growth Rate ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Fatigue Crack Growth Rate ◽  
Sweep Method ◽  
Frequency Sweep ◽  
Rate Test

Investigation on the Abnormal Crack Front in Fatigue Crack Growth Rate Test for Thick High Tensile Steel Plate

2013 ◽  
Author(s):  
Yan Dong ◽  
Jingxia Yue ◽  
Qian Yi ◽  
Heng Zhou ◽  
Hao Huang
Keyword(s):  
Growth Rate ◽  
Fatigue Crack ◽  
Stress State ◽  
Crack Growth Rate ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Fatigue Crack Growth Rate ◽  
Crack Front ◽  
Abnormal Behavior ◽  
Rate Test

Complex environmental loads unavoidably lead to fatigue damage in marine structures, and it becomes worse in high tensile steel thick-welded structure which has typical tri-axial stress state and the feature of brittleness. In this paper, a standard fatigue crack growth rate test for high-tensile steel Q370QE with thickness of 36 mm was carried out, and some material parameters and the threshold of stress intensity factor were obtained. Then, the abnormal behavior of a crack front during crack growth was analyzed by finite element method. Accordingly, the varying tendency of crack front shape could be qualitatively defined, and the plastic zoon at both flat and slope crack fronts for different crack depth was demonstrated based on plasticity analysis. Finally, local constraint factor was introduced to quantitatively describe the stress state along the crack front with the growth of fatigue crack, which provided proper explanation to why the crack front changes from slope to straight with the crack growing.

Influence of reactor water of nominal parameters on fatigue crack growth rate in 15Kh2NMFA steel

1985 ◽  
Vol 21 (2) ◽  
pp. 130-133
Author(s):  
V. I. Pokhmurskii ◽  
A. S. Zubchenko ◽  
A. A. Popov ◽  
I. P. Gnyp ◽  
V. M. Timonin ◽  
...  
Keyword(s):  
Growth Rate ◽  
Fatigue Crack ◽  
Crack Growth Rate ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Fatigue Crack Growth Rate ◽  
Reactor Water ◽  
15Kh2nmfa Steel

Effect of Hardness and Tensile Mean Stress on Fatigue Crack Growth in Beryllium Copper

1969 ◽  
Vol 11 (3) ◽  
pp. 343-349 ◽  
Author(s):  
L. P. Pook
Keyword(s):  
Growth Rate ◽  
Fatigue Crack ◽  
Crack Growth Rate ◽  
Fatigue Crack Growth ◽  
Residual Stresses ◽  
Crack Growth ◽  
Fatigue Crack Growth Rate ◽  
Mean Stress ◽  
Growth Data ◽  
Beryllium Copper

Some fatigue crack growth data have been obtained for age-hardened beryllium copper. The fatigue crack growth rate was found to be very dependent on the hardness and tensile mean stress. This dependence is believed to be associated with the intense residual stresses surrounding Preston-Guinier zones.

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