Physical basis of plasticity in solids by Jean-Claude Toledano

By Jean-Claude Toledano

This e-book introduces the actual mechanism of the plastic deformation of solids, which is predicated primarily at the incidence and movement of dislocations. those are linear defects, particular of crystalline solids whose movement below exterior stresses explains the relative ease during which solids (metals particularly) may be deformed so that it will supply them wanted shapes. the target is to introduce the subject to Read more...

content material: 1. advent. 1.1. Plasticity. 1.2. association and contents of the chapters. 1.3. basic references --
2. The constitution of crystalline solids. 2.1. creation. 2.2. Crystal geometry. 2.3. Bravais lattices. 2.4. Unit cells. 2.5. Examples of crystal buildings. 2.6. Non-crystalline solids --
three. Mechanics of deformable solids. 3.1. advent. 3.2. basic tensors. 3.3. Coordinate adjustments. 3.4. Stiffness tensor and crystal symmetry. 3.5. Isotropic solids --
four. Vacancies, an instance of aspect defects in crystals. 4.1. category of defects in crystals. 4.2. balance of point-defects in solids. 4.3. Formation of vacancies --
five. The geometry of dislocations. 5.1. creation. 5.2. instantly side dislocation. 5.3. different kinds of dislocations. 5.4. Volterra strategy of formation. 5.5. statement of dislocations --
6. pressure box of dislocations. 6.1. creation. 6.2. pressure and tension fields. 6.3. motion of a tension on a dislocation. 6.4. Line stress of a dislocation. 6.5. interplay among dislocations. 6.6. interplay among a dislocation and a emptiness --
7. Interactions with the lattice 7.1. creation. 7.2. center constitution of an area dislocation. 7.3. Peierls-Nabarro rigidity. 7.4. Dissociation of the dislocation middle --
eight. Microscopic mechanism of plasticity. 8.1. creation. 8.2. Plastic deformation and native shear. 8.3. undemanding slip and yield energy. 8.4. Dislocation assets. 8.5. Dislocation go with the flow and climb. 8.6. Hardening. 8.7. impression of temperature. 8.8. Deformation expense. 8.9. beginning of the variety of plastic behaviours.

Introduces the actual mechanism of the plastic deformation of solids, which is predicated primarily at the prevalence and movement of dislocations. Read more...

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Similarly to the case of solid-carbon, this is related to the fact that the cohesion between constituents of the corresponding solids relies on a covalent bonding having a marked directional character. Hence, an atom of silicon (Si) or of germanium (Ge) tends to be surrounded by four atoms forming a regular tetrahedron. The crystal structure common to the three preceding chemical elements is the so-called “diamond structure”. 12). Its basis contains two identical atoms (Fig. 20), and the conventional cell therefore contains 8 atoms.

18, these voids are located at the center of the cubic cell, and at the center of its edges (these are “equivalent” to the center of the cell since they are related geometrically to it by primitive translations). Each such site is surrounded by six iron atoms forming a regular octahedron, thus justifying their name. The cubic cell, which contains four iron atoms also contains four such sites. The proportion of carbon atoms is always small. Certain cubic cells will contain a carbon atom while others will not contain any.

13) ′ Thus the stiffness matrix Cαβ is symmetric. This symmetry reduces, for all solids, the maximum number of distinct stiffness coefficients to 21. 2 Crystal symmetry A third restrictive constraint derives from the specific crystal symmetry of the solid considered. Thus a metal with a cubic structure will not posses the same form of stiffness tensor Cijkl as a metal with a hexagonal symmetry. Indeed, the values of the Cijkl depend of the frame of reference, similarly to the components of a vector.

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