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Exact Determination of ?Keff and Crack Propagation Prediction for Selected Loading Sequences
H. Döker
H. Nowack
K. Schulte
K-H Trautmann
SJ. Zhang
出版
ASTM International
, 1993
URL
http://books.google.com.hk/books?id=2sp4zgEACAAJ&hl=&source=gbs_api
註釋
In the present study the correlation between the crack opening and crack propagation behavior under selected loading histories was systematically investigated on center cracked Al 7475-T7351 specimens. The development of the crack opening stress intensity Kop as the lower limit of the effective stress intensity factor range ?Keff, has been determined using the near threshold crack growth (NTCG) method as proposed by Döker and Bachmann. Significant crack closure (i.e., ?Keff ?K) was found for all sequences, and also for those at very high R-ratios (R 0.83). The crack growth behavior was determined by the DC-potential drop method and by striation measurements and showed significant retardation. The Kop values correlated with the da/dN measurements.
