By Sreeramesh Kalluri; Michael A. McGaw; Andrzej Neimitz
Thirty-nine peer-reviewed papers give you the most up-to-date study on fatigue and fracture mechanics. issues conceal:
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Additional info for Fatigue and Fracture Mechanics, Volume 37:
1520/JAI102713 41 FIG. 28—Schematic of the ETM ͓52͔: ͑a͒ The ␦5 crack opening parameter; ͑b͒ stressstrain curve and load-␦5 curve of a component; and ͑c͒ formulation of the ETM. 09 and m = 2 for plane strain ͑42e͒ ͑42f͒ The bracket term in Eq 42b was added to obtain a smoother transition from the yield point to the fully plastic region. The values that occur just at yield load, JY and ␦5,Y, respectively, are evaluated using Eqs 42 and are then taken as hinge points for extrapolation ͑see Fig. 28͑b͒͒.
The second one represents the behavior given by Eq 43. This module was applied to a pressure vessel with a crack in a nozzle as shown in Fig. 42. During the test, the crack tip opening displacement had been measured ͓77͔. 1520/JAI102713 53 FIG. 40—Notch module of the ETM ͓52͔: ͑a͒ Cracks emanating from a stress concentration; ͑b͒ deﬁnition of crack length to be used in the analysis. 2 ͩ ͪ ͬͮ R t 1/4 ͑52͒ where r and R denote the inner radius of vessel and nozzle, respectively. The resulting estimates model the test remarkably well, Fig.
20. It is 32 JAI • STP 1526 ON FATIGUE AND FRACTURE MECHANICS FIG. 20—Experimental and, with Eqs 35 and 36, estimated initiation values of K for ductile tearing, data from Ref 36. clear that such models can never be used to “predict” fracture toughness; however, they show how the various basic material parameters affect the result, and what could be done to improve the toughness of a speciﬁc material. Material data for validation of the three models can be found in Ref 36. It should be noted that the above derivations done in the framework of linear elastic fracture mechanics could be easily converted to elastic-plastic parameters such as the J-integral.