Entity

Time filter

Source Type


Mitkevich A.B.,Central Research Institute of Special Mechanical Engineering
Mechanics of Composite Materials | Year: 2012

A design model of transformation of a helically wound cylindrical pipe preform into a curvilinear spatial pipeline is proposed. A helical pipe surface is considered as an example. Relationships for displacements, strains, and reinforcement angles are obtained. The components of forces and moments necessary for the transformation are determined. © 2012 Springer Science+Business Media, Inc. Source


Mitkevich A.B.,Central Research Institute of Special Mechanical Engineering | Kul'Kov A.A.,Central Research Institute of Special Mechanical Engineering | Berlin A.A.,RAS Semenov Institute of Chemical Physics
Mechanics of Composite Materials | Year: 2011

A design model of axisymmetric transformation of a helically wound shell preform into a given shape is considered. Types of design problems are determined, and examples of their solution are given. Examples of fabrication techniques for structural prototypes by using the transformation method are included. © 2011 Springer Science+Business Media, Inc. Source


Kaledin Vl.O.,Central Research Institute of Special Mechanical Engineering | Mitkevich,Central Research Institute of Special Mechanical Engineering | Strakhov V.L.,Central Research Institute of Special Mechanical Engineering
Mechanics of Composite Materials | Year: 2012

The basic principles of a progressive methodology for calculating the fire resistance of reinforced structures, meant for application to high-rise, multifunctional, and unique buildings, are presented. The methodology is universal with respect to materials, types of building structures with fire protection, and different force and heat loads acting on them under the conditions of fire. It permits one to take into account all particularities of the thermomechanical behavior of structures in the case of joint action of thermal and force loads. The solution procedure is based on using high-level mathematical models and universal methods of numerical analysis, i.e., the finite-element method (FEM) and the finite-difference method (FDM). To simplify and reduce the labor content of computational algorithms, a mathematical model of special beam finite element has been developed, which in a natural way takes into account the complex structure of buildings, spatial nonuniformity of temperature fields, and the nonlinear behavior of materials. This procedure allowed us to determine the limits of applicability of the known approximate approach, which is based on the use of the concept of "critical temperature," to the estimation of fire resistance and to the design of fire protection of concrete structures. The procedure has been used in designing a number of unique structures built in Moscow. © 2012 Springer Science+Business Media, Inc.. Source

Discover hidden collaborations