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- W2018472011 abstract "A detailed discrete dislocation analysis of the behavior of a high temperature crack has been made. The high temperature tensile crack expands at a constant applied stress by emitting lattice dislocations in order to decrease its energy; otherwise it expands elastically. The lattice dislocations climb away from the crack under the action of the applied stress and the crack tip stress field. The work done by the excess vacancy concentration over the equilibrium value in opposing the dislocation climb is reversible. When the plane of climb of the lattice dislocation is the same as that of the crack plane, crack growth takes place at high energy since the crack pushes all the lattice dislocations during its growth. Thus, all the dislocations should necessarily climb forward. On the other hand, when the climb plane is inclined to the crack plane, the lattice dislocations which are formed at the tip climb forward under the action of the crack tip stress field; however, those remaining behind the tip climb back towards the crack and join the crack to decrease the vacancy concentration. The important difference between a low-temperature plastic crack and that at high temperature lies in the fact that frictional work on glide dislocations is irreversible, while work done on climb dislocations by the excess vacancy concentration is reversible." @default.
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- W2018472011 date "1978-04-01" @default.
- W2018472011 modified "2023-09-27" @default.
- W2018472011 title "Discrete dislocation analysis of a high-temperature crack" @default.
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- W2018472011 doi "https://doi.org/10.1016/0025-5416(78)90150-7" @default.
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