By W. A. Shaw

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Note that a state of zero force with a negative slope appears between x x = 0 and x1 =2a; this condition corresponds to a stable state for dislocation mobility, and the effect of the vacancy clusters can be said to cause a trapping effect of the dislocation. Such a phenomenon is associated with the quench hardening of single crystals [7]. CRACK INITIATION A R O U N D A DISLOCATION Another application of the slab energy analogy is the determination of the strain energy decrement of a dislocation caused by the introduction of a crack in its vicinity.

Therefore, plastic stress analysis can be accomplished by the slab analogy through the distribution of proper dislocations in a certain domain. This domain is called the plastic domain and the stress field, which is the sum of the dislocation stress and the regular elastic solution, must satisfy Mises yield condition, as follows, 1(σχ-σγ) 2 + σ: (10) As an example, consider the uniaxial tension of a notched bar, as shown in Fig. 7. The Airy stress function in the slice is analogous to the deflection of a geometrically similar slab bending about its >>-axis.

This means that crack initiation is most favorable either at the position of a dislocation (piled-up dislocations) or parallel to the slip plane (Θ = 0). This result is supported by experiments on the fracture of Zn crystals by Deruyttere and Greenough [8], Gilman [9] and Stofel and Wood [10]. When fracture starts for the root of piling-up dislocations, Stofel and Wood show that the cleavage strength of the slip plane decreases to one-seventh of its value associated with some other origin of the fracture.