1,282 research outputs found
Anisotropic properties of mechanical characteristics and auxeticity of cubic crystalline media
Explicit expressions for inverse of Young's modulus E, inverse of shear
modulus G, and Poisson's ratio for cubic media are considered. All these
characteristics of elastic media depend on three components of the compliance
tensor S, and on direction cosines of mutually perpendicular vectors m and n
with fourfold symmetry axes. These characteristics are studied for all
mechanically stable cubic materials for vectors n belonging to the irreducible
body angle subtended by three cubic high symmetry directions [001], [111], and
[110]. Regions in the stability triangle of in which cubic elastic materials
are completely auxetic, non-auxetic, and auxetic are established. Several
intermediate-valence compounds belonging to the region of complete auxecity are
indicated. The extreme properties of E^{-1}, G^{-1} and Poisson ratio
established by Hayes and Shuvalov are confirmed.Comment: 16 pages, 8 figures, 2nd Workshop on Auxetics and Related Systems
Bedlewo (near Poznan), August 19-23, 200
2D and 3D cubic monocrystalline and polycrystalline materials: their stability and mechanical properties
We consider 2- and 3-dimensional cubic monocrystalline and polycrystalline
materials. Expressions for Young's and shear moduli and Poisson's ratio are
expressed in terms of eigenvalues of the stiffness tensor. Such a form is well
suited for studying properties of these mechanical characteristics on sides of
the stability triangles. For crystalline high-symmetry directions lines of
vanishing Poisson's ratio are found. These lines demarcate regions of the
stability triangle into areas of various auxeticity properties. The simplest
model of polycrystalline 2D and 3D cubic materials is considered. In
polycrystalline phases the region of complete auxetics is larger than for
monocrystalline materials.Comment: 9 pages, 3 figures, in proceedings of the Tenth International School
on Theoretical Physics, Symmetry and Structural Properties of Condensed
Matter, Myczkowce 200
Modeling Virtual Organization Architecture with the Virtual Organization Breeding Methodology
While Enterprise Architecture Modeling (EAM) methodologies become more and
more popular, an EAM methodology tailored to the needs of virtual organizations
(VO) is still to be developed. Among the most popular EAM methodologies, TOGAF
has been chosen as the basis for a new EAM methodology taking into account
characteristics of VOs presented in this paper. In this new methodology,
referred as Virtual Organization Breeding Methodology (VOBM), concepts
developed within the ECOLEAD project, e.g. the concept of Virtual Breeding
Environment (VBE) or the VO creation schema, serve as fundamental elements for
development of VOBM. VOBM is a generic methodology that should be adapted to a
given VBE. VOBM defines the structure of VBE and VO architectures in a
service-oriented environment, as well as an architecture development method for
virtual organizations (ADM4VO). Finally, a preliminary set of tools and methods
for VOBM is given in this paper.Comment: 9 pages, 4 figure
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