Crack Growth Retardation in Two Low-Strength Materials Under Displacement Controlled Cyclic Loading

2009 ◽  
pp. 171-171-11
Author(s):  
JA Kapp ◽  
JH Underwood ◽  
JJ Zalinka
Keyword(s):  
Cyclic Loading ◽  
Crack Growth ◽  
Growth Retardation ◽  
Low Strength ◽  
Crack Growth Retardation

S180 Invited—In Situ Probing of Crack Growth Retardation During Cyclic Loading

2008 ◽  
Vol 23 (2) ◽  
pp. 190-190
Author(s):  
S. Y. Lee ◽  
H. Choo ◽  
P. K. Liaw ◽  
K. An ◽  
T. R. Watkins ◽  
...  
Keyword(s):  
Cyclic Loading ◽  
Crack Growth ◽  
Growth Retardation ◽  
Crack Growth Retardation

Estimation of fatigue crack growth retardation due to crack branching

2004 ◽  
Vol 29 (4) ◽  
pp. 446-452 ◽  
Author(s):  
D.G. Pavlou ◽  
N.V. Vlachakis ◽  
M.G. Pavlou ◽  
V.N. Vlachakis
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Growth Retardation ◽  
Crack Branching ◽  
Crack Growth Retardation

The Effect of Crack Growth Retardation when Comparing Constant Amplitude to Variable Amplitude Loading in an Aluminium Alloy

2014 ◽  
Vol 891-892 ◽  
pp. 948-954 ◽  
Author(s):  
Madeleine Burchill ◽  
Simon A. Barter ◽  
Michael Jones
Keyword(s):  
Growth Rate ◽  
Fatigue Life ◽  
Crack Growth Rate ◽  
Crack Growth ◽  
Growth Retardation ◽  
Crack Front ◽  
Constant Amplitude ◽  
Variable Amplitude ◽  
Growth Increments ◽  
Crack Growth Retardation

It has often been observed that the growth of short fatigue cracks under variable amplitude (VA) cyclic loading is not well predicted when utilising standard constant amplitude (CA) crack growth rate/stress intensity data (da/dN v DK). This paper outlines a coupon fatigue test program and analyses, investigating a possible cause of crack growth retardation from CA-only testing. Various test loading spectra were developed with sub-blocks of VA and CA cycles, then using quantitative fractography (QF) the sub-block crack growth increments were measured. Comparison of these results found that, after establishing a consistent uniform crack front using a VA load sequence, the average crack growth rate then progressively slowed down with the number of subsequent CA load cycles applied. Further fractographic investigation of the fracture surface at the end of each CA and VA sub-block crack growth, identified significant crack front morphology differences. Thus it is postulated that a variation or deviation from an efficient crack path is a driver of local retardation in short crack growth during CA loading. This may be a source of error in analytical predictions of crack growth under VA spectra loading that may need to be considered in addition to other potential effects such asless closure whilst cracks are small. For aircraft designers, using solely CA data for fatigue life predictions this may result in non-conservative estimates of total crack fatigue life, producing unexpected failures or an increased maintenance burden.

Constraint corrected cycle-by-cycle analysis of crack growth retardation under variable amplitude fatigue loading

2019 ◽  
Vol 125 ◽  
pp. 199-209 ◽  
Author(s):  
Jie Zhang ◽  
Louis Muys ◽  
Steven De Tender ◽  
Nahuel Micone ◽  
Stijn Hertelé ◽  
...  
Keyword(s):  
Crack Growth ◽  
Growth Retardation ◽  
Fatigue Loading ◽  
Variable Amplitude ◽  
Variable Amplitude Fatigue ◽  
Crack Growth Retardation
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