Continuum Models for Phase Transitions and Twinning in by Mario Pitteri

By Mario Pitteri

Continuum versions for part Transitions and Twinning in Crystals provides the basics of a remarkably profitable method of crystal thermomechanics. built during the last 20 years, it really is in line with the mathematical thought of nonlinear thermoelasticity, within which a brand new standpoint on fabric symmetry, influenced by way of molecular theories, performs a primary function. this is often the 1st equipped presentation of a nonlinear elastic method of twinning and displacive part transition in crystalline solids. The authors improve geometry, kinematics, and effort invariance in crystals in robust connection and with the aim of investigating the particular mechanical facets of the phenomena, rather in an elastostatics framework in keeping with the minimization of a thermodynamic power. attention-grabbing for either mechanics and mathematical research, the recent idea deals the potential for investigating the formation of microstructures in fabrics present process martensitic part transitions, similar to shape-memory alloys.Although phenomena akin to twinning and section transitions have been as soon as inspiration to fall outdoor the variety of elastic types, examine efforts in those components have proved fairly fruitful. proper to numerous disciplines, together with mathematical physics, continuum mechanics, and fabrics technology, Continuum versions for part Transitions and Twinning in Crystals is your chance to discover those present learn tools and themes.

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Additional resources for Continuum Models for Phase Transitions and Twinning in Crystals (Applied Mathematics)

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Since the properties of different matrices representing the same linear transformation in different bases will be relevant for us, we keep linear transformations and their groups clearly distinct from matrices and their groups. The 9-dimensional space Aut R3 of all invertible tensors is denoted for short by Aut ; the latter contains the 6-dimensional subspace of symmetric tensors and the convex cone of symmetric, positive definite tensors, denoted by Sym and Sym> , respectively. Aut is a group with respect to the usual noncommutative tensor multiplication, with unit element 1;2 Sym is not a multiplicative subgroup of Aut, only a vector subspace.

2 The Baumhauer experiment; (a) schematic description; (b) picture of an actual twinned calcite crystal From Klassen-Nekliudova (1964), courtesy of Kluwer Academic/Plenum Publishers. 3 X-ray diffraction of a hexagonal metal, along (a) the sixfold hexagonal axis; (b) one of the twofold axes in the basal plane; (c) the sixfold axis after the twinning shear sketched in (d) has occurred; notice the twofold-like spots From Klassen-Nekliudova (1964), courtesy of Kluwer Academic/Plenum Publishers. grown in such a way that they have more than one composition plane or surface.

For instance, in the Introductory Remarks to the Symposium on Twinning held in Madrid, Buerger (1960) mentions that the reader of the proceedings will find a divergence of views on certain points, no attempt having been made by the editor to force any uniformity into the treatment or results, and stresses that one point of divergence concerns the kind of symmetry which can relate the individuals of a twin pair. The disagreement appears to arise from a different definition of a twin. Definitions and diverse remarks on the phenomenon of twinning are given by Evans (1912), Friedel (1926) pp.

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