The Effect of Load Reduction Scheme on Crack Closure in the Near-Threshold Regime

2005 ◽  
Vol 2 (6) ◽  
pp. 11988
Author(s):  
SR Daniewicz
Keyword(s):  
Crack Closure ◽  
Load Reduction ◽  
Reduction Scheme ◽  
Threshold Regime ◽  
Near Threshold

Oxide induced crack closure in the near threshold regime: The effect of oxide debris release

2018 ◽  
Vol 117 ◽  
pp. 21-26 ◽  
Author(s):  
J. Maierhofer ◽  
D. Simunek ◽  
H.-P. Gänser ◽  
R. Pippan
Keyword(s):  
Crack Closure ◽  
Oxide Debris ◽  
Threshold Regime ◽  
Near Threshold

Plasticity-induced crack closure under plane-strain conditions in the near-threshold regime

2002 ◽  
Vol 82 (17-18) ◽  
pp. 3299-3309 ◽  
Author(s):  
R. Pippan ◽  
F. O. Riemelmoser ◽  
H. Weinhandl ◽  
H. Kreuzer
Keyword(s):  
Plane Strain ◽  
Crack Closure ◽  
Plasticity Induced Crack Closure ◽  
Threshold Regime ◽  
Near Threshold

Evaluation of Fatigue Crack Growth Curves in Existing Codes and a Proposed Modification Based on Experimental Data of Cr-Ni-Mo-V Steel Welded Joints

2016 ◽  
Author(s):  
Yan-Nan Du ◽  
Ming-Liang Zhu ◽  
Fu-Zhen Xuan ◽  
Shan-Tung Tu
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Welded Joints ◽  
Growth Curves ◽  
Crack Growth Behavior ◽  
Fatigue Assessment ◽  
Crack Growth Model ◽  
Threshold Regime ◽  
Near Threshold

A comparison of currently available codes for assessment of fatigue crack growth, including ASME (America Society of Mechanical Engineers) SEC. XI, FKM (Forchungskuratorium Maschinenbau) guideline, WES (Japan Welding Engineering Society) 2805, BS7910 and JSME (The Japan Society of Mechanical Engineers), was carried out by paying attention to the suitability of application and the easiness to obtain the parameters, based on fatigue crack growth data of Cr-Ni-Mo-V steel welded joints. Results showed that fatigue crack growth curves provided by the FKM or WES were good choice when few inputs were at hand while the curves in the BS7910, JSME and ASME were recommended for precise estimation. It was indicated that the assessment of welded joints solely by fatigue crack growth behavior at base metal part and the assessment of fatigue crack growth for the aged condition by as-received one both resulted in non-conservativeness, albeit dependent on the range of stress ratios, R. A new bilinear form of fatigue crack growth model independent of R was developed based on transition point occurred in the near-threshold regime. This constituted the bilinear approach to fatigue assessment, and thus contributed to the optimization of fatigue assessment in the near-threshold regime.

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