No 3 (2017)

The article concerns the questions of the forming of the space thin walled structures on curvilinear planes. They may be used for constructions of the social buildings, exhibition, on sport structures. This method may be used for forming surfaces at 4, 3 and 2-angale plans with curvelinear supporting contour lines and on the planes of closed curves as circle or ellipse as well

This article gives an overview of previously carried out work on the accuracy of the calculation, determine the mounting loads of metal structures. Given the results of the study of the mounting stress-strain state, which occurs in structures-span hinge-rod cover warehouse balls and reagents. Numerical study of the mounting stress-strain state is made by finite element method, which is implemented in the computing complex SCAD. Also, see impact assessment values installation effort on the carrying capacity of the individual rods coated. Presentation of the efforts made in the form of histograms. The values obtained efforts indicate that the development of measures necessary to reduce the value of the initial forces generated during assembly cover and respectively the geometrical deviations in the coating in its design

The differential equations are received and the new exact solution of a problem for a rec- tangular cross section and flat statically determination beam structure at action of longitudinal and transvers loadings is constructed. Three characteristic areas of the beam, distinguished by schemes of position of elastic core section were considered. All the components of the stress- strain state, borders of elastic-plastic zones are determined. A numerical analysis of linear and nonlinear formulation was presented.

It is described an algorithm for calculating axisymmetric articulated shells with different physical and mechanical characteristics of materials based on the FEM using scalar and vector interpolations of displacement fields. As part of the sampling, a curved fragment of the merid- ian of the shell with nodes i and j is used. The analysis of VAT thin-walled structures made of heterogeneous materials in the form of a cylinder, articulated to the sphere and ellipsoid is fulfilled.

We consider a temperature changes near end of curvilinear crack with end zones of mate- rial cohesive forces in bending strip (beam). The aim of the local temperature changes is a delay or inhibition of crack growth. Boundary value problem for equilibrium of curvilinear crack under the action of external bending loads, induced thermoelastic stress field and trac- tions in bonds, preventing its disclosure, is reduced to a system of nonlinear singular integro- differential equations with the kernel of Cauchy type. Condition of crack limit equilibrium is formulated on the basis of a two-parameter fracture criterion.

The possibility of obtaining forged products from billets of rectangular shape with cut and uncut edges. Experimental measurements of elastic distortion of the side walls from the ideal contour details. Recommendations for the design of die tooling and improve the quality of extractable product box shapes