(a) Again, with reference to Fig. 5.1, describe what might be expected to happen to the dislocation configuration of this crystal if a horizontal tensile were to be applied to right and left faces of the crystals.
(b) What would be the effect on this dislocation configuration of Fig. 5.1 if the tensile stress inpart (a) of this problem were to be changed to a compressive stress?
Solution:
(a) A tensile stress is associated with an increase in size of the extra plane of a dislocation. Thus,in reference to the figure for this problem (below), the extra plane, which lies inside the twovertical and one horizontal segments of the Frank?Read disloaction configuration, will growin size with the forward vertical segment moving towards the front of the crystal, and theone in back of it moving towards the rear. At the same time the horizontal segment willmove downward.
(b) A compressive stress will act to decrease the size of the extra plane and the movements described in (a) of this problem will be reversed.
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