[en] The weight minimization of rotationally symmetric plates is subjected to dynamic loads of short duration. Constraints concerning plate thickness and occuring stresses are taken into account. The maximum stress values in time are evaluated by an effective method using finite elements, orthogonal Ritz-vectors and Newmark-integration. For one particular dynamic load condition the theoretical and experimental results are compared. The measurements are in good agreement with the results of calculation. (orig./DG)

[en] The elastic torques are investigated with different rolling torques in a rolling-mill drive. The dynamic load on the rolling stand is parametrically analyzed.

[en] In the temperature range from room temperature to 973 K and the mechanical loading range from 0.1 to 3 MPa, a Li₂TiO₃ pebble bed was successively loaded and the packing behaviour of the bed was observed. Deformation caused by the mechanical loading is partly relaxed when the bed is heated without the load. After a large numbers of thermal and mechanical loading cycles, the packing factor of the bed increased from the initial packing factor of 66.9% to finally about 68.5%. This progressive increase in packing leads to production of a cavity region at the top of the pebble bed, therefore it is important to obtain a high initial packing factor.

[en] The procedure and the typical techniques that are used in NUCLEN for the design and the calculation of the piping of Nuclear Plants. The classification system are generically described and the analysis techniques which are used for the design and verification of the piping systems, i.e. pressure design for the dimensioning of the wallthicknesses, temperature and dead weight analysis together with determination of support points, are shown. The techniques of dynamic design and analyses are described for earthquake and pressure impulse loadings. (Author)

[en] Using the solution of the problem of elastic half-space's reaction to normal and axial tangent loads, running along circular cavity, we investigate the mode of deflection of rock massif in the vicinity of shallow-placed tunnel under the influence of loads of the above-stated kinds evenly distribution along the tunnel's final length. (author)

[en] For investigating the damaging mechanism, bithermal TMF tests have been carried out with the alloy 800H, applying fast pressure half-cycles at low temperature (e.g. 300 C) and slow tensile phases at high temperature (e.g. 700 C). The experimental data thus obtained have been compared with the results of isothermal tests performed at 700 C. Most of the experiments have been performed stress-controlled and with a constant range of plastic strain. Under this regime, deformation is induced in the case of asymmetric test design within the tensile load phase, at various constant tensile stresses each, wheras in the compressive load phase, the stress is constantly increased for compressive stress-governed testing. The results obtained from both test types show that the type of compressive load phase is the factor governing the efficiency of pore formation. (orig.)

[en] To permit calculation of the fatigue strength of drive components, drives are classified in terms of their loading conditions. Formulas are presented for the equivalence factors used in converting the actual variable loading conditions to conventional constant conditions. The overload coefficients required in calculating the static strength of drive components at the peak load are also determined.

[en] Development of a method of concentrated deformations with reference to static calculation of girders on the inhomogeneous elastic basis is esteemed in the article. The obtained numerical outcomes are compared to the analytical solution. (author)

[en] Closed form solutions have been obtained using Fourier transform method for the deflection, curvature and particle velocity of a long elastic beam when it is subjected to a concentrated transverse force which is varying with time. These solutions have been illustrated with the help of two force histories, i.e. a half-sine pulse and a rectangular pulse. Dimensionless parameters representing deflection, curvature and particle velocity have been plotted as functions of dimensionless distance and dimensionless time. Furthermore, the particular case of constant velocity impact which has been studied by other authors using different techniques has also been considered in the present paper and the results compare within numerical errors involved in the evaluation of integrals. (orig.)

[en] In this paper it is presented a variational method for the limit analysis of an ideal plastic solid. This method has been denominated as Modified Secundary Creep and enables to find the collapse loads through a minimization of a functional and a limit process. Given an ideal plastic material it is shown how to determinate the associated secundary creep constitutive equation. Finally, as an application, it is found the limit load in an pressurized von Mises rigid plastic sphere. (Author)