Method of measuring large elastic-plastic strains of dynamically loaded plates and shells

Strength of Materials -     

Computational Investigation of the Effect of Reinforcement Schemes and Angles on the Stress-Strain State and Strength of Composite Cylinders Under Axisymmetric Internal Explosion. Part 2. Calculation Results for Single- and Two-Layer Cylinders with Symmetrical Reinforcement of the Layers

Strength of Materials - The effect of reinforcement schemes and angles on the stress-strain state and strength of single- and two-layer wound composite cylinders of finite length with symmetrical...     

Mechanical and technological properties of welded joints produced after plasma cutting

The results of investigations of the mechanical properties of welded joints produced after cutting 09G2N steel by mechanical methods and by plasma torches of different design are presented. It is shown that the impact toughness and static bend strength of the welded joints, produced after plasma cutting without removing the zones of the thermal effect, are not inferior to the parameters obtained after mechanical cutting. In the application of the new single-circuit plasma torch for cutting metals prior to welding, it is possible to produce high-quality welded joints with high productivity and low energy consumption.     

Exact solution of flow theory problems with isotropic-kinematic hardening. Part 2. Setting of the deformation trajectory in the spaces of total and plastic strains

For an arbitrary isotropic and linear kinematic hardening and loading paths given in the form of arbitrary multisection polygonal lines in the five-dimensional deviatoric space of total strains, we have studied analytically an initially isotropic elastoplastic material with von Mises yielding and the associated flow rule. The solutions obtained are valid for arbitrary relationships that govern the variation of the spherical component of the stress tensor. For arbitrary isotropic and kinematic hardening, we have also obtained an analytical solution to an elastoplastic problem for an arbitrary deformation trajectory given in the deviatoria space of plastic strains Institute of Problems of Strength, National Academy of Sciences of Ukraine, Kiev, Ukraine. Translated from Problemy Prochnosti, No. 1, pp. 62–71, January–February, 2000     

Construction of constitutive relations for simple in Noll's sense materials with viscoelastic-viscoplastic behavior

Within the class of simple in Noll's sense materials, the media with viscoelastic-viscoplastic behavior have been singled out, whose arbitrary deformations and types of symmetry in properties have been expressed by general constitutive relations, in which the long-term fading memories of the deformation and time histories take place, and the approaches to their specialization have been developed. __________ Translated from Problemy Prochnosti, No. 1, pp. 6–12, January–February, 2009.     

Interlayer Gap Effect on the Dynamics and Strength of Two-Layer Metal Composite Cylinders under Internal Explosion

Strength of Materials - The effect of contact conditions and the gap between the metal and composite layers on the stress-strain state and strength of a two-layer metal composite cylinder under...     

Simulation of the proportional deformation of elastoplastic continua simple in Noll’s sense. Part 1. Defining relations

We formulate a representation of the general defining relations for strain-hardening elastoplastic materials simple in Noll’s sense. The problem of simulation of a special case of the so-called active proportional deformation is analyzed in detail. Institute for Problems of Strength, National Academy of Sciences of Ukraine, Kiev, Ukraine. Translated from Problemy Prochnosti, No. 5, pp. 59–70, September–October, 1998.     

Justifying Calculations of the Security of Promising Machines and Man–Machine Systems on the Risk Criteria of Accidents and Disasters

Further development of calculation and experimental analysis methods and ensuring their security against risk criteria for the prevention of accidents and disasters is considered. Of particular importance in this direction are the methods and technologies of both computational and physical modeling and analysis of the limiting states of structures leading to catastrophic failure. It is shown that the most promising direction of creating an effective apparatus for risk assessment and analysis of the security of technical systems can be considered the use of hybrid methods that allow taking into account both stochastic and interval uncertainties of the risk parameters in determining the safety and security conditions of man, the technosphere, and nature from manmade accidents and disasters.