129 research outputs found
One-axis stretching of the elasto-plastic plates with square hole of different orientation relatively the axis of stretching
На основі числового розв’язування крайових задач теорії малих пружно-пластичних
деформацій для лінійно зміцнюваного матеріалу з урахуванням розвантаження з’ясовано вплив
орієнтації квадратного отвору в пластині на її напружено-деформований стан за одновісного розтягу.Effective numerical methods for solving 2D problems related to the theories of elasticity and
plasticity have been worked out. The variation-difference method of building finite difference schemes is
extended to domains with curvilinear boundaries and disconnected domains.
The application of the variation-difference method for solving problems of the theory of small elasto-
plastic deformations relatively the plates with a hole, taking into account the linear strengthening of the material
and unloading, has been developed. For solving the resultant systems of nonlinear and linear equation, the
Newton-Kantorovich method and combined iterative method (gradient and cyclic Chebyshev’s one) were
proposed to be used. The choice of iteration parameters of the methods for solving the obtained systems of linear
and nonlinear algebraic equations was made.
The elaborated software ensures solving the problems with different boundary conditions, medium and
domain parameters.
A variety of problems concerning one-axis stretching of the plates with the square hole of different
orientation relatively the axis of stretching is numerically solved. The zones of evolution of plastic deformations
for step enlarging of the loading are constructed, the remaining deformations and the limit loads are obtained.
The influence of the orientation of square hole in the plate onto the stress magnitude was found. The
orientation of the hole does not make essential influence onto the shape of zones of generation and development
of residual deformations, but it essentially impacts onto magnitudes of the components of the stress tensor and
its intensity, and therefore the moment of the beginning of plastic deformation. That is, in a plate with rotated
square hole the initial plastic deformations appear under the tension 45% less than in a non-rotated one
Influence of stress concentrators onto stress-strain state of elasto-plastic plates
На основі числового розв’язування крайових задач теорії малих пружно-пластичних деформацій для лінійно зміцнюваного матеріалу з урахуванням розвантаження з’ясовано вплив концентраторів напружень (отвору, розрізу, абсолютно жорсткого включення) в пластині на її напружено-деформований стан за одновісного розтягу.Effective numerical methods for solving 2D problems related to the theories of elasticity and plasticity have been worked out. The variation-difference method of building finite difference schemes is extended to domains with curvilinear boundaries and disconnected domains.
The application of the variation-difference method for solving problems of the theory of small elasto-plastic deformations relatively the plates with a hole and a cut, taking into account the linear strengthening of the material and unloading, has been developed. For solving the resultant systems of nonlinear and linear equation, the Newton-Kantorovich method and combined iterative method (gradient and cyclic Chebyshev’s one) were proposed to be used. The choice of iteration parameters of the methods for solving the obtained systems of linear and nonlinear algebraic equations was made.
The elaborated software ensures solving the problems with different boundary conditions, medium and domain parameters.
A variety of problems concerning one-axis stretching of the plates with a disk hole (or rigid body instead of a hole) and a cut (or a thin rigid body instead of a cut) is numerically solved. The zones of evolution of plastic deformations for step enlarging of the loading are constructed, the residual strains and the limit loads are obtained.
The influence of a disk hole, cut and rigid body instead of a hole or cut in the plates onto the stress magnitude was found. The presence of rigid bodies instead of a hole or a cut strengthen the plate in general, in particular, plastic strains in the plate with rigid bodies instead of a hole and a cut appear under tension stress in 2,75 times more, than in the plate with a disk hole and a cut, and yield limit arrives at tension stress in 1,79 times more. A long thin rigid body strengthens a plate more than a disk one. The residual strains around a rigid body in the plates with a disk rigid body and a cut, and in the plates with a disk hole and a thin rigid body do not arise, in general
Stress-strain state of elasto-plastic linearly strengthenable plates with two perpendicular cuts under all-round stretching
За допомогою числового розв’язування крайових задач теорії малих пружно-пластичних деформацій для лінійно зміцнюваного матеріалу з’ясовано напружено-деформований стан пружно-пластичних пластин з двома перпендикулярними розрізами за всебічного розтягу.Effective numerical methods for solving 2D problems related to the theories of elasticity and plasticity have been worked out. The variation-difference method of building finite difference schemes is extended to disconnected domains.
The application of the variation-difference method for solving problems of the theory of small elasto-plastic deformations relatively the plates with cuts, taking into account the linear strengthening of the material and unloading, has been developed. For solving the resultant systems of nonlinear and linear equation, the Newton-Kantorovich method and combined iterative method (gradient and cyclic Chebyshev’s one) were proposed to be used. The choice of iteration parameters of the methods for solving the obtained systems of linear and nonlinear algebraic equations was made.
The elaborated software ensures solving the problems with different boundary conditions, medium and domain parameters.
A variety of problems concerning all-round stretching of the elasto-plastic plates with two perpendicular cuts is numerically solved. The zones of evolution of plastic deformations for step enlarging of the loading are constructed. There are found the stresses under which the yield limit and the strength limit are achieve in the plates. On the base of numerical analysis the following main regularities are found: under the close mutual location of cuts in the plate, the plastic deformations first appear under the stress which is 33% less than in the plate with the same cuts under the far mutual location; however, the strength limit in the plates in the both considered cases is achieve practically under the same stress
Mechanism of planning and implementation strategy crisis management engineering companies during the economic crisis
A distributed-object infrastructure for corporate websites
A corporate website is the virtual representation of a cor-poration or organization on the Internet. Corporate web-sites face numerous problems due to their large size and complexity, and the nonscalability of the underlying Web infrastructure. Current solutions to these problems gener-ally rely on traditional scaling techniques such as caching and replication. These are usually too restrictive, however; taking a one-size-fits-all approach and applying the same solution to every document. We propose Globe as a founda-tion upon which to build scalable corporate websites, and introduce GlobeDoc, a website model based on Globe dis-tributed shared objects. This paper describes GlobeDoc, highlighting the design and technical details of the infras-tructure. 1
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