ISSN:
1573-4862
Keywords:
Acoustic diffraction
;
acoustic transmission
;
asperity contact
;
crack closure
;
fatigue cracks
;
mode conversion
;
NDE
;
stress intensity factor
Source:
Springer Online Journal Archives 1860-2000
Topics:
Electrical Engineering, Measurement and Control Technology
,
Mathematics
Notes:
Abstract The partial contact of two rough fatigue crack surfaces leads to transmission, reflection, diffraction, and mode conversion of an acoustic signal at those contacts. This paper reviews recent experimental and theoretical efforts to understand and quantify such contact on actual fatigue cracks in greater detail. It is shown that the size and density of individual contacts, or asperities, can be estimated from acoustic measurements. Furthermore, it is shown that this information is useful to provide the static stress across a partially closed crack as well as the “effective” stress intensity range which activates fatigue crack propagation.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00566225
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