Low Cycle Fatigue Behavior of VVER-440 Reactor Pressure Vessel Steels at Isothermal Condition

2015 ◽  
Vol 812 ◽  
pp. 47-52 ◽  
Author(s):  
Balazs Fekete ◽  
Peter Bereczki ◽  
Peter Trampus
Keyword(s):  
Fatigue Life ◽  
Plastic Strain ◽  
Pressure Vessel ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Isothermal Condition ◽  
Reactor Pressure Vessel ◽  
Cycle Fatigue ◽  
Pressure Vessel Steels ◽  
Reactor Pressure

The fatigue life of the structural materials 15H2MFA and 08H18N10T of VVER-440 reactor pressure vessel under completely reserved total strain controlled tests were investigated. The measurements were carried out with isothermal condition at 260°C on GLEEBLE 3800 servo-hydraulic thermal mechanical simulator. The isothermal low cycle fatigue results were evaluated with the plastic strain based Coffin-Manson law, and plastic strain energy based model as well. It was shown that both methods are able to predict the fatigue life of reactor pressure vessel steels accurately.

Thermographic investigation of the fatigue behavior of reactor pressure vessel steels

2001 ◽  
Vol 314 (1-2) ◽  
pp. 131-139 ◽  
Author(s):  
B. Yang ◽  
P.K. Liaw ◽  
H. Wang ◽  
L. Jiang ◽  
J.Y. Huang ◽  
...  
Keyword(s):  
Pressure Vessel ◽  
Fatigue Behavior ◽  
Reactor Pressure Vessel ◽  
Pressure Vessel Steels ◽  
Thermographic Investigation ◽  
Reactor Pressure

Effect of Strain Rate on Low Cycle Fatigue Behavior of Thermally Aged A533B Pressure Vessel Steels in High Temperature Water

2003 ◽  
Author(s):  
Xinqiang Wu ◽  
Yasuyuki Katada
Keyword(s):  
Strain Rate ◽  
Pressure Vessel ◽  
Environmental Effect ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Aging Treatment ◽  
Cycle Fatigue ◽  
High Temperature Water ◽  
Pressure Vessel Steels ◽  
Temperature Water

Safe and reliable management of light water reactors demand a full understanding on their component materials properties throughout their service lives. In present work the effects of strain rate on low cycle fatigue behavior of ASTM A533B pressure vessel steels after long-term thermal aging at 673 K in air have been investigated in simulated BWR environments. It was found that the aging treatment led to a certain decrease in fatigue life. Environmental effect on the fatigue life of aged materials closely depended on strain rate. More strongly environmental effect appeared at low strain rate. The aging treatment enhanced the stain-rate dependence of the fatigue resistance of A533B steels. Comparison between ASME design fatigue curves and present results as well as some literatures’ data suggested that safety margins of the standard design curves tended to decrease with decrease in strain rate. Based on the above results, possible corrosion fatigue mechanisms of pressure vessel steels in high temperature water were discussed by taking into account the effects of inclusions, hydrogen embrittlement, dynamic strain aging and aging-induced material degradation as well as their combined actions.

Low Cycle Fatigue of Sn96 Solder With Reference to Eutectic Solder and a High Pb Solder

1991 ◽  
Vol 113 (2) ◽  
pp. 102-108 ◽  
Author(s):  
H. D. Solomon
Keyword(s):  
Fatigue Life ◽  
Melting Point ◽  
Plastic Strain ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Cycle Fatigue ◽  
Eutectic Solder ◽  
Soldering Temperature ◽  
Higher Temperature ◽  
Strain Cycling

This paper describes the 35°C and 150°C low cycle fatigue behavior of Sn96 solder (96.5 Sn/3.5 AG), the tin silver eutectic. There is a considerable amount of anecdotal information which says that this solder is superior to eutectic solder in its fatigue resistance. This study generally supports this assertion, but not for all plastic strain ranges. This solder has an excellent balance of strength, ductility and fatigue life under strain cycling. Furthermore, it is also shown that this solder is superior to a high Pb solder (92.5 Pb/2.5 Ag/5.0 Sn). The only drawback of the tin silver eutectic is that it has a higher melting point than the melting point for the Sn/Pb eutectic (221°C versus 183°C), and this requires a higher soldering temperature. This higher temperature necessitates some process alterations in order to use this solder.

Strain-Life Behavior in 60/40 Solder

1989 ◽  
Vol 111 (2) ◽  
pp. 75-82 ◽  
Author(s):  
H. D. Solomon
Keyword(s):  
Fatigue Life ◽  
Plastic Strain ◽  
Simple Shear ◽  
Curve Fitting ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Cycle Fatigue ◽  
Load Drop ◽  
Fitting Procedure ◽  
Life Behavior

This paper describes low cycle fatigue test run at −50°C, 35°C, 125°C, and 150°C on thin 60 Sn/40 Pb solder joints, tested in simple shear. The low cycle fatigue behavior was found to be a function of the criteria used to define the fatigue life. Different drops in the hysteresis load, measured when a constant plastic strain is being applied, was used to define failure. Not only was the magnitude of the fatigue life a function of the load drop definition for failure, it was also found that the Coffin-Manson low cycle fatigue exponent was a function of this definition. The choice of dependent variable for the curve fitting procedure used to calculate the Coffin-Manson exponent is also considered.

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