By Valery N. Shlyannikov
This ebook comprises an elastic-plastic research of acquire harm and fracture with sensible purposes to engineering fabrics and constitution fatigue lifestyles estimations. types in addition to sensible functions are offered which makes the booklet attention-grabbing for either practitioners and theoretical researchers. specific emphasis is laid on new techniques to the mixed-mode challenge in fatigue and fracture, and particularly to the fracture harm region (FDZ) process. the result of the verified experimental and theoretical researches ends up in the presentation of other crack progress types, predicting the crack development price and fatigue lifetime of an firstly angled crack below biaxial a great deal of arbitrary course. detailed cognizance is paid to the sensible functions of the prompt models.
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Additional resources for Elastic-Plastic Mixed-Mode Fracture Criteria and Parameters
As shown in Fig. 5, differences between the crack-tip-displacement vector shapes do arise behind the crack tip. 5,a between the displacements for e = 0' ahead of the crack tip depending on the strain hardening exponent. Thus, for n = 2,3 the position of the crack tip at e = 0' have remained unchanged and the displacement vector is equal to zero. It is clear that in this case the deformed configuration of the crack tip is only the blunted tip-shape. While for n =5,9 and 13 an increment of displacement of the point lying on the axis e = e' ahead of the crack tip is increased when strain hardening increases from 5 to 13.
As shown in Hutchinson [68,69], Rice and Rosengren , Shih  the value of the dominant singularity is s = (2n+ 1)/(n+ 1) for pure mode I, pure mode II and mixed mode I and II. 19 is homogeneous in dimensionless stress function Airy ;;; . 2. We normalized our stress solutions so that the maximum value of O-variation of effective stress ae is set a unity. Solutions to the dominant singularity have been obtained for strain hardening exponent n ranging from 2 to 13. Figure 12 shows the pure mode I and pure mode II the crack-tip stress solutions for n =3 and n = 13, respectively.
B'e - 3 5 4 e = 45 t5 (/) (/) 2 d istance r O"o IJ 6 ~------------~-----. o 4 1 0 5 (/) (/) - f!! f!! (/) 3 ( /) (/) (/) (/) (/) .!!! 5"C E "C 1 O~ o __ ~ 1 __L -_ _L -_ _ 2 3 distance r O"o IJ L_~ 4 5 distance r O"o IJ Fig. 11. The stress variations ahead of the crack tip (8=0°) and in a direction of (8=45°) ing of the crack tip does not exist. 9 both stresses depend on mode mixity. The normal stress (feo decrease with the increase of mode mixity value characterized by the parameter M p , while the effective stress (fe has a inverse trend of variation with respect to the increase of M p .