Read source

Although this sometimes occurs through the operation of Frank-Read sources it is not generally observed. What does generally occur is similar, but more complex. The process is called multiple-cross-glide, and was proposed by Koehler (1952). Its importance was hrst demonstrated experimentally by Johnston and Gilman (1959). In addition to its existence, they showed that the process produces copious dislocation dipoles which are responsible for deformation-hardening. 

The six hooks that make up the set are independent of each other. That is, readers may approach all of the hooks in any sequence whatsoever. To assist the reader in extending his or her understanding of each subject, each hook in the set includes a glossary and a list of additional reading sources from both print and Internet sources. Short bibliographic sketches of important figures from each of the six fields are also included in the hooks. 

Sir Frederick Charles Frank (1911-1998) received his Ph.D. in 1937 from Oxford University, followed by a postdoctoral position at the Kaiser Wilhelm Institut fiir Physik in Berlin. During World War II, Frank was involved with the British Chemical Defense Research Establishment, and because of his keen powers of observation and interpretation, he was later transferred to Scientific Intelligence at the British Air Ministry. In 1946, Frank joined the H. H. Wills Physics Laboratory at the University of Bristol under its director, Nevill Mott, who encouraged him to look into problems concerned with crystal growth and the plastic deformation of metallic crystals. A stream of successes followed, establishing his scientific fame, as evidenced by many eponyms the Frank-Read source, the Frank dislocation, Frank s rule, Frank-Kasper phases. His theoretical work has been the foundation of research by innumerable scientists from around the world. Frank was awarded the Order of the British Empire (OBE) Medal in 1946, elected a Fellow of the Royal Society (FRS) in 1954, and was knighted in 1977. 

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Frank-Read Sources. It is well known that with increasing deformation, the density of dislocations increases. This effect is illustrated in fig. 8.40 in which the number of dislocations as a function of the strain is indicated schematically. The immediate conclusion from this observation is the fact that there are sources... 

Fig. 8.41. Frank-Read source as obtained using dislocation dynamics (adapted from Zbib et al. (1998)).

Moulin A., Condat M. and Kubin F. P, Simulation of Frank-Read Sources in Silicon, Acta Mat. 45, 2339 (1997). 

This book emphasizes the practical over the theoretical. There are numerous sources for in-depth study of topics including polymerization and the polymer science of fluoropolymers. Some of these references have been listed at the end of pertinent chapters, serving as both bibliography and additional reading sources. Review papers are particularly helpful as a starting point for finding additional sources for concentrated reading in a selected area. 

Fig. 17) onto an intersecting slip plane (see Fig. 23). After travelling a short distance on the new plane, that part of the dislocation may resume its motion on another plane of the original slip system. The segment XY, which has reached a third slip plane, can now act as a Frank-Read source and radiate new loops on their respective planes. In other words, through a process of cross glide, a dislocation line can make its own Frank-Read source.

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