By Sreeramesh Kalluri; Michael A. McGaw; Andrzej Neimitz
Thirty-nine peer-reviewed papers give you the newest examine on fatigue and fracture mechanics. subject matters disguise:
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Extra info for Fatigue and Fracture Mechanics, Volume 37:
24 JAI • STP 1526 ON FATIGUE AND FRACTURE MECHANICS FIG. 13—Principle of measurement of small amounts of crack extension in the scanning electron microscope, after Refs 21–25. plastic deformation ahead of a crack tip, ⍀, whose length is about two times the crack tip opening displacement. It is assumed that the ﬁrst stage of local void formation occurs when this plastic zone reaches an inclusion ͑Fig. 15͑b͒͒. 1520/JAI102713 25 FIG. 14—SZW width data obtained on six materials in comparison with the blunting line in Eq 32, after Ref 21.
This is a necessary but not a sufﬁcient condition; the stress peak moving along the x-axis with increasing applied load has to hit a weak spot that may cause cleavage ͑Fig. 22͑d͒͒. This latter effect is one of the origins of scatter. Further scatter is caused by variability of cleavage strength and yield strength. With the values of Y and cl, as well as the stress distribution, the onset of cleavage fracture can be estimated. 3 N/͑1+N͒ 2 ͑37͒ The cleavage strength as obtained from the bend bars at −196° C exhibits substantial variability ͑Fig.
These are due to the presence of the interfaces between the base plate and 54 JAI • STP 1526 ON FATIGUE AND FRACTURE MECHANICS FIG. 41—Notch module of the ETM ͓52͔, driving force diagrams: ͑a͒ For CTOD; ͑b͒ for J. weld metal, causing inhomogeneous deformation and constraint conditions. For simplicity, a weld can be regarded as consisting of the base plate, B, and an embedded strip having the width, 2H, representing the weld metal, W ͑Fig. 43͑a͒͒. As a consequence of the different plastic properties of the two constituents, a strongly discontinuous strain distribution across the weld is observed; this, of course, is only the case when at least one of the two partners exceeds its yield strength.