Zobrazeno 1 - 10
of 195
pro vyhledávání: '"Spatschek, R."'
Autor:
Spatschek, R., Gobbi, G., Hüter, C., Chakrabarty, A., Aydin, U., Brinckmann, S., Neugebauer, J.
We investigate phase separation including elastic coherency effects in the bulk and at surfaces and find a reduction of the solubility limit in the presence of free surfaces. This mechanism favours phase separation near free surfaces even in the abse
Externí odkaz:
http://arxiv.org/abs/1606.01411
We discuss hydrogen diffusion and solubility in aluminum alloyed Fe-Mn alloys. The systems of interest are subjected to tetragonal and isotropic deformations. Based on ab initio modelling, we calculate solution energies, then employ Oriani's theory w
Externí odkaz:
http://arxiv.org/abs/1605.00084
Autor:
Hüter, C., Friák, M., Weikamp, M., Neugebauer, J., Goldenfeld, N., Svendsen, B., Spatschek, R.
Publikováno v:
Phys. Rev. B 93, 214105 (2016)
We investigate non-linear elastic deformations in the phase field crystal model and derived amplitude equations formulations. Two sources of non-linearity are found, one of them based on geometric non-linearity expressed through a finite strain tenso
Externí odkaz:
http://arxiv.org/abs/1602.02537
Autor:
Bhogireddy, V. Sai Pavan Kumar, Hüter, C., Neugebauer, J., Shchyglo, O., Steinbach, I., Spatschek, R.
We investigate the ability of a multi-order parameter phase field model with obstacle potentials to describe grain boundary premelting in equilibrium situations. In agreement with an energetic picture we find that the transition between dry and wet g
Externí odkaz:
http://arxiv.org/abs/1412.2891
We present a non-diagonal phase field model for phase transformations with unequal but finite diffusivities in the two phases. This model allows to recover the desired boundary conditions at the interface, and especially the elimination of the artifi
Externí odkaz:
http://arxiv.org/abs/1411.0523
Publikováno v:
Eur. Phys. J. Special Topics 223, 527 (2014)
We investigate theoretically the effects of elastic and plastic deformations on heterogeneous nucleation and nanowire formation. In the first case, the influence of the confinement of the critical nucleus between two parallel misfitting substrates is
Externí odkaz:
http://arxiv.org/abs/1408.0603
Autor:
Bhogireddy, V. Sai Pavan Kumar, Hüter, C., Neugebauer, J., Steinbach, I., Karma, A., Spatschek, R.
We investigate the multi-order parameter phase field model of Steinbach and Pezzolla [I. Steinbach, F. Pezzolla, A generalized field method for multiphase transformations using interface fields, Physica D 134 (1999) 385-393] concerning its ability to
Externí odkaz:
http://arxiv.org/abs/1404.6663
We investigate a model which couples diffusional melting and nanoscale structural forces via a combined nano-mesoscale description. Specifically, we obtain analytic and numerical solutions for melting processes at grain boundaries influenced by struc
Externí odkaz:
http://arxiv.org/abs/1403.6973
Publikováno v:
Phys. Rev. E 83 (2011)
A continuum model of crack propagation is presented and discussed. We obtain steady state solutions with a self-consistently selected propagation velocity and shape of the crack, provided that elastodynamic and viscoelastic effects are taken into acc
Externí odkaz:
http://arxiv.org/abs/1012.3945
Fracture is a fundamental mechanism of materials failure. Propagating cracks can exhibit a rich dynamical behavior controlled by a subtle interplay between microscopic failure processes in the crack tip region and macroscopic elasticity. We review re
Externí odkaz:
http://arxiv.org/abs/1001.4350