Figure 3.2 Frank-Read source ,tb for dislocation multiplication. tb Slipped area is shaded. Loop instability point is reached when shear stress 1 Gb|ll. (From Read;' Dislocations in Crystals, McGraw-Hill Book Co., New York, © 1953. Used with permission of McGraw-Hill Book Company.) (a) (b) (c) - tb (d)

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In Fig. 3.2, must it be true that the dislocation segments at points C and C' are screw dislocations? And must it
be true that they are of opposite sign?

Figure 3.2 Frank-Read source
,tb for dislocation multiplication.
tb
Slipped area is shaded. Loop
instability point is reached when
shear stress 1 Gb|ll. (From
Read;' Dislocations in Crystals,
McGraw-Hill Book Co., New
York, © 1953. Used with
permission of McGraw-Hill Book
Company.)
(a)
(b)
(c)
- tb
(d)
Transcribed Image Text:Figure 3.2 Frank-Read source ,tb for dislocation multiplication. tb Slipped area is shaded. Loop instability point is reached when shear stress 1 Gb|ll. (From Read;' Dislocations in Crystals, McGraw-Hill Book Co., New York, © 1953. Used with permission of McGraw-Hill Book Company.) (a) (b) (c) - tb (d)
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