scholarly journals Time-dependent crack growth behavior of a nitrogen strengthened Ni-Fe-Cr-Nb-N alloy 120

1998 ◽  
Author(s):  
W. Ren ◽  
R.W. Swindeman
Keyword(s):  
Crack Growth ◽  
Growth Behavior ◽  
Time Dependent ◽  
Crack Growth Behavior ◽  
Time Dependent Crack Growth

Contributions of Time Dependent and Cyclic Crack Growth to the Crack Growth Behavior of Non Strain-Crystallizing Elastomers

2002 ◽  
Vol 75 (4) ◽  
pp. 643-656 ◽  
Author(s):  
J. J. C. Busfield ◽  
K. Tsunoda ◽  
C. K. L. Davies ◽  
A. G. Thomas
Keyword(s):  
Crack Growth ◽  
Growth Behavior ◽  
Time Dependent ◽  
Crack Growth Behavior ◽  
Wide Range ◽  
Dependent Component ◽  
Tearing Energy ◽  
Quasi Crystals ◽  
Crack Growth Rates ◽  
Time Dependent Crack Growth

Abstract Engineering components are observed to fail more rapidly under cyclic loading than under static loading. This reflects features of the underlying crack growth behavior. This behavior is characterized by the relation between the tearing energy, T, and the crack growth per cycle, dc/dn. The increment of crack growth during each cycle is shown here to result from the sum of time dependent and cyclic crack growth components. The time dependent component represents the crack growth behavior that would be present in a conventional constant T crack growth test. Under repeated stressing additional crack growth, termed the cyclic crack growth component, occurs. For a non-crystallizing elastomer, significant effects of frequency have been found on the cyclic crack growth behavior, reflecting the presence of this cyclic element of crack growth. The cyclic crack growth behavior over a wide range of frequencies was investigated for unfilled and swollen SBR materials. The time dependent crack growth component was calculated from constant T crack growth tests and the cyclic contribution derived from comparison with the observed cyclic growth. It is shown that decreasing the frequency or increasing the maximum tearing energy during a cycle results in the cyclic crack growth behavior being dominated by time dependent crack growth. Conversely at high frequency and at low tearing energy, cyclic crack growth is dominated by the cyclic crack growth component. A large effect of frequency on cyclic crack growth behavior was observed for highly swollen SBR. The cyclic crack growth behavior was dominated by the time dependent crack growth component over the entire range of tearing energy and/or crack growth rate. The origin of the cyclic component may be the formation/melting of quasi crystals at the crack tip, which is absent at fast crack growth rates in the unswollen SBR and is absent at all rates in the swollen SBR.

Time-dependent crack growth behavior for a SMAW weldment of Gr. 91 steel

2013 ◽  
Vol 110 ◽  
pp. 66-71 ◽  
Author(s):  
Woo-Gon Kim ◽  
Jae-Young Park ◽  
Hyeong-Yeon Lee ◽  
Sung-Deok Hong ◽  
Yong-Wan Kim ◽  
...  
Keyword(s):  
Crack Growth ◽  
Growth Behavior ◽  
Time Dependent ◽  
Crack Growth Behavior ◽  
Time Dependent Crack Growth

Transient Crack Growth Behavior Under Cycle/Time-Dependent Step Loading for Pb-Containing and Pb-Free Solders

2013 ◽  
Vol 42 (12) ◽  
pp. 3593-3608 ◽  
Author(s):  
Kittichai Fakpan ◽  
Yuichi Otsuka ◽  
Yukio Miyashita ◽  
Yoshiharu Mutoh ◽  
Kohsoku Nagata
Keyword(s):  
Crack Growth ◽  
Cycle Time ◽  
Growth Behavior ◽  
Time Dependent ◽  
Crack Growth Behavior ◽  
Step Loading

Crack Growth Behavior in Alloy 718 at 425°C

1978 ◽  
Vol 100 (4) ◽  
pp. 381-387 ◽  
Author(s):  
K. Sadananda ◽  
P. Shahinian
Keyword(s):  
Crack Growth ◽  
High Stress ◽  
Growth Behavior ◽  
Time Dependent ◽  
Crack Growth Behavior ◽  
Limiting Factor ◽  
Alloy 718 ◽  
Linear Elastic ◽  
Combined Loads ◽  
Cycle Dependent

Subcritical crack growth behavior in Alloy 718 was studied at 425°C under static, cyclic, and combined loads. The results are analyzed using linear elastic fracture mechanics. Crack growth was shown to be cycle-dependent at all stress intensities at this temperature and hold times up to 10 min have no effect on the crack growth rates. On the other hand, crack growth is shown to occur readily under static loads at stress intensities less than half of the fracture toughness value. Comparison of the present results with those published in the literature showed that while crack growth is cycle-dependent at 425°C and time-dependent at 650°C, at an intermediate temperature, 540°C, it is time-dependent at low stress intensities and cycle-dependent at high stress intensities. Extrapolation of the present data shows that crack growth under static load could occur at temperatures above approximately 350°C and this may be a limiting factor for Alloy 718 for some of its high temperature applications.

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