The deformation path between B2 and B33 is suggested by Density Functional Theory calculations , , , with a combination of shear and shuffle. This inelastic behavior is called plastic deformation. O PTIMAL paths of deformation between homogeneous states of finite strain are identified on the basis that the work expended should be an absolute minimum. Donna Whitney, University of Minnesota . P-T-t Paths . What is a P-T-t path? The materials considered are classically rigid/plastic, isotropic and nonhardening, with any convex yield surface. It leads to much lower strength and large plastic deformation along the selected paths. During the B2 to B33 transformation, three-fold, four-fold rotations and a few mirrors in B2 disappears, so there are twenty-four crystallographically equivalent pathways. First-principles calculations reveal an intriguing mechanism for bond transformation mediated by three-center bonding, which reduces considerably the rigidity and directionality of the two-center covalent bonds in γ-boron. , the organization of the martensite variants. Our focus is on relating deformation to quantities that can be measured in the ﬁeld, such as the change in distance between twopoints, the change in orientation of a line, or the change in volume of a borehole strain sensor. Structural Geology - by Haakon Fossen July 2010. In principle, a distinction can be made between elastic deformation and plastic deformation. Path deformation principle. In other words, stress and strain follows Hooke’s law. Fig. Elastic deformation. Therefore, the identification of the true paths could be made by the microstructural fingerprints, i.e. The principle of FRP is based on thickness thinning, so the deformation path significantly impacts the forming effect. Metamorphism is a dynamic process, involving changes in temperature ± pressure through time. However, under the two paths, the structure deformation happens on different systems, thus they should have different impacts on variant organization. The initial path is deformed so as to account for the triangular obstacle that was unknown at planning time [5]. The pressure (P) - temperature (T) - time (t) path of a metamorphic rock is the set of all P-T conditions experienced by a rock during its metamorphic history (Figure 1). A deformation is called elastic deformation, if the stress is a linear function of strain. This topic presents an overview of deformation, homogenous and heterogenous deformation and strain in 1D and 2D. One speaks of an elastic deformation when only a relatively low force ist action on the atoms in the respective material and therefore the atoms are only moved slightly. 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