Full version is in v2_11.zip (in Russian) Ivashkov I.A., Martynenko M.E., Sadakov O.S. Experimental determination and mathematical description of a limit surface of graphite under comlex loading The existence of a limit surface for graphite was checked under complex loading at testing of tubular specimens. Limit surfaces at monotonous and cyclic loading are compared. With the accuracy of natural scatter of experimental data it is possible to believe, that such surface exists. Besides the surface' shift relative to coordinate origin, some difference of its shape from spherical is found out. Printed in vol.2 (may 1996), pp.24-28.

Full version is in v2_12.zip (in Russian) Volume 3 Mursakhanov G.H., Shchugorev V.N. Destruction of dynamicaly loaded layered composite beams containing delaminations Composite materials have high strength and rigidity in a direction of layers but relatively weak resist linear destruction. Within the framework of the multiparametrical mechanics od destruction, offered by V.V.Bolotin, destruction of beams made of layered composites with various defects is investigated with low- speed impact. Beams with various fastening, containing presurface delaminations and defects of internal delaminatio type are considered. In frames of a general eqation of Delamber-Lagrange dependences of coordinates Lagrange and Griffits on time for various parameters of loading are constructed. It is shown that generalized force moved a crack grows with changing of Lagrange coordinates.Crack tip starting occurs when moved force achieves the critical significance. During growth of a crack the equality of generalized force moved of a crack and forces of resistance is saved. Shut down of a crack occurs when shift of a mark of equality of generalized forces on inequaity. Full version is in v3_01.zip (in Russian) D.A.Gokhfeld, O.S.Sadakov and K.M.Kononov On the ultimate strain criterion for fracture prediction at normal and elevated temperatures A new strength criterion of the deformation type which is based on results of experimental investigation carried out by Bridgman and other scientists is discussed in the paper. As analysis shows, the criterion is characterised, in general, by better correspondence comparing the traditional strength criteria, and embrases both conditions of short-time and long-time fracture. Some interesting result concerning triaxial equal stress state was obtained as well. Full version is in v3_02.zip Mokeyev V.V. Oscillations of elastic system with acoustic medium Finite element formulation of elastic shell - acoustic medium interaction as matrix equations for acoustic medium pressure values and elastic shell displacements is summarised in this article. Such formulation causes the nonsymmetric matrix equations that their solution impedes substantially. Nonsymmetric matrix equations are reduced to symmetric ones by transfer to acoustic medium displacement potential in conjunction with equation for acoustic pressure. Frequency condensation method is utilised for solution of eigenvalue problem for received matrix equations. The proposed approach reliability is demonstrated by numerical results. Full version is in v3_03.zip V.V. Mokeyev, E.J. Fot Frequency condensation method - effective approach in the solution of structural dynamic problem One of main problem, arising at solution of structural dynamic problems with help of finite element method to is problem of eigenvalue of large matrix systems. For the solving of this problem is offered to use a frequency condensation method. This method can be applied at accounts of natural frequencies and shapes as elastic structures as structure - gas and structure - fluid systems. The frequency condensation method is based on reduction matrices size and uses the approximation, which preserves the frequencies in pre-set interval. Comparison of a method with other methods is carried out. The analysis shows, that on accuracy and speed the frequency condensation method does not concede to such iterative methods as subspace iterations method and Lanczos method, and on reliability surpasses them. Full version is in v3_04.zip Martynenko M.E., Sadakov O.S. Forecasting of cyclic creep curve on the basis of analysis of structural model The process of unilateral strain accumulation at asymmetric cyclic loading (known under the term cyclic creep) is considered. Under some assumptions, connection between parameters of a stress cycle (amplitude and average meaning) and accumulated strain to a given moment of loading time is received in the incremental form. Initial data for construction of cyclic creep curve are: a stress-strain curve at initial loading, dependence of steady creep speed from a stress (so-called rheological function of a material) and strain speed in a cycle. The solving is built on average value of strain increment per a cycle, dependent on accumulated strain to the given moment. Offered expressions are recommended to use as physical equations at calculation of structures form alteration under cyclic external influence. The offered method is less time-consu- ming than traditional one: the direct calculation of inelastic strain kinetics takes more than to the order of labor input. Full version is in v3_05.zip Cherniavsky A.O. Probabilistic approach to calculation of kinetics of crack meshes Formation and growth of cracks' systems (meshes) at surfaces of heat-stressed structures considered. The growth of cracks treated as random process due inhomogeneity of material. A method for analysis of the mesh's growth is offered. It allows to determine statistical distribution of crack's length and distances between them. Calculation of the probability of occurrence of rather close and deep cracks allow to estimate the opportunity of crumbling of the structure surface, which is usually more dangerous than just the development of a crack mesh. Full version is in v3_06.zip Budilov I.N., Zhernakov V.S. Technological heredity and destruction processes in units and joints In the present paper the approaches of linear fracture mechanics were used for the estimation of durability of fasteners. The values of the stress intensity coefficient were determined with account of residual technological stresses: both in the portion of the radius transition and outside of it. Breakage diagrams were drawn up and basic mechanisms of fatigue crack formation in threaded parts were determined with account of technological heritage. The calculations were executed numerically by a finite element method in flat and volume formulation with FEA system ANSYS 5.1 accounting the contact interaction in the zone of interface. Full version is in v3_07.zip Berezin I.Ya. , Abyzov A.A. The concept and methods of life-time tests of mobile machines (Part II) Part II illustrate application of model of movement to problems of forecasting of operational load and reliability of elements of transport machines. Main factors of external action are considered; the original method is offered for determination of function of change of speed of movement along path. The application of a technique of imitation lifetime tests is illustrated on example of forecasting of reliability heavy-loaded element of running gear system. Full version is in v3_09.pdf (in Russian) A.G.Gorshkov, O.V.Egorova, V.N.Saizev, A.l.Medvedskii, L.N.Rabinskii, D.V.Tarlakovskii Acoustic vibrations and soundproofing of cylindrical shells The problems associated with soundproofing of thin-walled structures, being of grant practical importance, are accompanied by rather cumbersome numerical analysis, particularly for the wide range of wave numbers. Because of these difficulties, this problem is further decomposed into two stages. At the first stage, analytical solution based on the simplified equations of the shell theory is constructed. This solution enables us to find out the peculiarities of the shell behavior under varions external actions and to switch to the second stage, where the refined solution is developed. At this stage, the problem is solved numerically with the aid of the finite element method and with in the framework of the engineering theory of ortotropic laminated cylindrical shells. Full version is in v3_08.pdf (in Russian) V.A. Postnov Inverse Eigenvalue Problem and Identification of Elasic Systems The method of determination of boundary conditions of a beam by mathematical processing of experimentally measured frequent spectra of considered elastic system (beam) and some systems received from initial system as " a black box " by entering of certain changes of its boundary conditions is proposed. By numerical experiment with using of the generator of random numbers the stability of offered algorithm for solution of the considered problem has been demonstrated. Full version is in v3_10.pdf (in English) V.A. Postnov, M.I. Trubachev A new finite element with transverse shear deformations included for shell strength analysis Using the Mindlin-Reissner hypothesis about the law of tangent displacement distribution directly from the equations of the three dimensional theory of elasticity is received the full shell energy functional in arbitrary curvilinear system of co-ordinates. From the stationary condition of the functional a new model four-node shell for the moderately thick shell analysis is constructed. The final expressions for stiffness matrix and vector of the external forces are brought. The proposed element is free from the locking effect. As against existing numerous isoparametric finite elements (FE), in the present article isoparametric co-ordinates are entered at the last stage of reception of final expressions for the stiffness matrix and the vector of external forces of the finite element and can be considered only as a convenient means for numerical integration. Full version is in v3_11.pdf (in English) Mironov V.I. Modeling of cyclic properties of a material on the basis of its static stress-strain diagram alteration This work presents experimental results concerning the degradation of static properties of special specimens for two constructional materials. One-dimensional models of degradational type material are built to interpret the obtained results. Possibility of their using in technological practice is discussed. Full version is in v3_12.pdf (in Russian) Fedotov V.P. Modeling of clad metal exstrusion with diffusion of hydrogen consideration The hydrogen in the certain range of temperatures and concentrations essentially improves the plastic properties of titanium alloys. This phenomenon is called as hydrogenous plasticization. However, this effect has not received wide development in production now because of complexity of check of hydrogen contents at hydragenation in industrial conditions. The exact control is necessary, since even of small excesses over allowable concentration of hydrogen can result in converse effect - hydrogenous embrittlement. The work on the example of problem of clad metal exstrusion shows the opportunity of optimization of such process with the help of preliminary hydragenation of titanium core. Full version is in v3_13.pdf (in Russian) Zelenkov Yu.A. Investigation of vibrations of flexible shaft with impact damper in process of non-stationary rotation In the present paper the impact damper is used for the reducing of vibrations of flexible shaft which is accelerated over critical speed. This shaft is presented as beam with distributed parameters. It is carried one rigid disk simmetrically established between bearings. The shaft rotating engine has a limited power. Use of impact damper allows it to avoid effect of Sommerfeld, to reduce time of acceleration up to working speed of rotation and amplitude of vibration. Full version is in v3_14.pdf (in Russian) Volume 4 Zelenkov Yu.A. Non-central impact of two moving-in-plane bodies investigation based on common theory of shock In the present paper the common theory of shock is used for the investigation of non-central impact of two arbitrary form bodies. This non-central impact can be realized in three variants which are differed by relative slip velocity of the bodies. There received equations for after-impact velocities of the bodies and shock impulses for each variant of impact. Full version is in v4_01.pdf (in Russian) Cherniavsky O.F. Stability of processes of progressive collapse at low-cycle loading A review of experimental data is given; processes of progressive collapse are classified depending on ration of elastic and plastic strains. The problem of stability of cyclic non-elastic deformation is considered under point of view of shakedown theory. It is shown that the theory allow to find bifurcation points for the process and to predict post-critical behavior of structure. Full version is in v4_02.pdf (in Russian) Chirkov V.P., Markovic R.Y. Suspend system parameters optimization of transport vehicles under the maximum reliability criterion Casual spatial fluctuations of multiwheeled vehicle, moving along stochastic uneven surfaces, are examined. Influence of elastic and viscous suspend system characteristics and tires are investigated on body spectral features and wheels with different velocities. Optimum parameters of suspend system are selected under the criterion of maximum reliability. Full version is in v4_03.pdf (in Russian) V.A.Kopnov Life distribution estimation by intrinsic fatigue curves The use of intrinsic fatigue curves determininig fatigue behavior of specimens is considered. Each sample intrinsic fatigue curve is corresponded to fatigue properties of a specimen. The fatigue damage accumulation problem of a crane metalwork subjected to stationary loads is studied. Life functions as well as life distribution functions are obtained for the proposed fatigue damage models. Full version is in v4_04.pdf (in Russian) V.V.Mokeyev Dynamic behaviour simulation of viscoelastic structure by finite element method Behaviour of structures from viscoelastic materials is considered. In paper a generalised complex vectors method allowing to take into account the real change viscoelastic properties in frequency range and heterogeneousness of their distribution on the structure is described. The method does not impose restrictions on number of functions for describing viscoelastic property of material. The method possibilities are demonstrated on problem of influence investigating of viscoelastic Poisson's ratio upon forced vibration amplitudes of viscoelastic structure. Full version is in v4_05.pdf (in Russian) Poznjak E.V., Samogin J.N., Hromatov V.E. Spectral analysis of natural frequencies of reactor set process equipment and pipeline systems A method of the decomposition for matrix algorithm of the account of natural frequencies of a reactor set is developed. At that the interaction of its elements (process equipment, pipeline systems, supports of designs) is taken into account. Is shown, that the account of this interaction is justified in a frequent range above 10 Hz. Full version is in v4_06.pdf (in Russian) Samogin J.N., Chirkov V.P. Reconstruction of the vibrational field of structures under vibration sensors indications An algorithm of the reconstruction of the vibrational field under indications of limited number of vibration sensors is described. The efficiency of this algorithm is illustrated on an example reactor shaft. The vibration sensor is placed on the reactor vessel. At that in areas of the structure, where measurements are impossible, the vibrational field is reconstructed. Full version is in v4_07.pdf (in Russian) Mursakhanov G.H. Residual resource estimation of trunk pipelines based on fracture mechanics criterion Deterministic and halfdeterministic methods of residual resource estimation of trunk pipelines based on fracture mechanics criterion are presented. The results of experimental study of strength and fracture toughness characteristics of material on linear parts of trunk pipeline being exploited for more than 20 years are given. As an example, residual resource of trunk pipeline containing such defects as dents, scratches, pits etc. is estimated. Full version is in v4_08.pdf (in Russian) Mokeyev V.V. Modal analysis of surface wave-fluid-structure interaction problem A technique for dynamic analysis of the interaction of a structure with a linear fluid is presented. It is based on finite element discretization and determination of response by modal superposition analysis. The eigenvalue problem is solved with the help of frequency condensation method. It is shown that this method is an efficient means for large fluid-structure eigenvalue problem. Numerical example is given to demonstrate the good results of frequency condensation method. Full version is in v4_09.pdf (in English) Chirkov V.P., Ligay T.G. Construction damage probability estimate on the base of test results using the residual resource criteria Statistic approach is applied for failure probability estimate of construction elements basing on the test results and the residual resource. Diverse factors and limited information about defects of different kinds are taken into consideration. Full version is in v4_10.pdf (in Russian)