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From the mid-18th century extensive research in Sweden and in present day Finland was focused on the development of mortars with hydraulic and pozzolanic properties. The [...]
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The occurrence of deformation twins in the ductile-to-brittle transition (DBT) temperature region were observed under different testing conditions. Mechanical twinning c [...]
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Structures operating at high temperatures are damaged by creep processes. If the structure is also subjected to cyclic loading, the fatigue damage is usually significant. [...]
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A two-parameter fracture mechanics method is applied to small cracks near a stress concentrator. The small crack in the present contribution is considered as crack influe [...]
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V příspěvku jsou uvedeny některé výsledky výzkumu MKP modelování šíření únavových trhliny v podmínkách smíšeného módu namáhání. Pro simulování r [...]
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Pečínka, L.
Pipe break probabilities calculated in nuclear industry for purposes of PSA studies are based either on the in sights from the operating experience or on the fracture mec [...]
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The basic fracture properties of cement-based composite are ascertained on the basis of test evaluations of the specimens in suitable test configurations. Three-point ben [...]
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This contribution presents a simple numerical model for crack growth under mode-I compressive fatigue loading. Residual tensile stress at the crack tip, which is responsi [...]
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Under the consideration of the bi-material notch composed of two orthotropic materials the potential direction of the crack initiated from the notch tip is determined fro [...]
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In this paper is solved a 3D analysis of growing crack of the chevron notched three-point-bending specimen. On macroscale the specimen body is modeled as an elastic homog [...]
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The contribution deals with the 3D analysis of the chevron notched three point bending specimen which is used to determine the fracture toughness of brittle matrix compos [...]
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The crack growth prediction techniques in the critical area of the small transport aircraft undercarriage bracket has been describe in this paper. Stress-state was determ [...]
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The influence of corner singularity on crack behaviour for a threedimensional structure is described in this paper. The distribution of stress singularity through the thi [...]
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The contribution discusses possible approach for the formulation of fracture criteria for the general stress concentrators – especially a surface crack terminating at t [...]
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Outcomes of a numerical simulation of flow through an unbalanced control valve during the turbine's operational modes. A 2D as well as a 3D calculation study is considere [...]
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This paper is aimed at reducing vibrations of bladed disk in particular operating state. The damping element used in this contribution is realized by a strap with isoscel [...]
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Abstrakt: A stability criterion based on generalized strain energy density factor for a crack terminating at the bi-material inteiface is suggested. The strain energy den [...]
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The paper is devoted to fatigue crack propagation in layered materials. The influence of plasticity induced crack closure on threshold values for fatigue crack propagatio [...]
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The reactors VVER – 440 are cooled and moderated by pressurized water – PWR. The primary coolant is subcooled in the PWR and steam is generated by transferring energy [...]
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The basic form of the exhaust hood for single flow arrangement of steam turbine was designed by the experience from the optimization process of hoods for double flow arra [...]
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A 3D elastic-plastic FEM model with small strains was used for simulation of the deformation mechanics at the curved front of the planar fatigue crack growing in the thic [...]
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Cyclic tests with the maximum force in a cycle Fmax = 5,5 kN and the cycle asymmetry ratio R = F min / F max = 0, 1 were carried out on fiat specimens of 5mm in thickness [...]
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A substantial number of experimentally based works indicate the changes in crack propagation direction on bi-material interface in composite laminate materials. The paper [...]
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To the interpretation of crack growth, it is substantial to estimate the plastic region geometry in front of a crack. Performed here is a study for predicting crack growt [...]
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This article shows: 1. Some studies of a low-cycle material fatigue caused by cyclical contact between two spheres with the same diameters. The spheres are made up from m [...]
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Experimentally investigated pressure pulsation downstream of the control valve cone is presented here. The valve with the mufflers and the flat bottom is compared with th [...]
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The aim of this paper is to investigate the beginnings of crack propagation from sharp V-notches. Stress distribution around the tip of a V-notch is described on the basi [...]
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The principle of a steam turbine balanced control system is presented here. The dynamic stress measurement method in parts of valves on its models in the aerodynamic wind [...]
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A stage with impulse blading on a drum rotor is considered. Steam leakage through the shroud and shaft sealing has been determined by means of a numerical simulation. The [...]
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The research focuses on developing a new type of vertical axis wind power generator, in which fan-shaped up-structure with floating foundation on water is used to catch t [...]
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This paper is concentrated on modelling of friction effects in bladed disk of steam turbine, which are realized by means of friction elements placed between blades shroud [...]
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This paper is concerned with mathematical modeling of the imperfect bladed disk with friction elements, which are used to suppress blade vibration. These kinds of systems [...]
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The article is a contribution to numerical simulations of pitting arise phenomena on the gear teeth. The basic assumption of the presented simulations was that pitting (p [...]
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The paper describes effects of end wall shaping in guide blades on steam turbine stage efficiency. CFD and measurement of straight blade cascades in a wind tunnel were pe [...]
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Experimental investigation of profile and secondary losses is presented here. The loss coefficients of different types of blade cascades are evaluated, the efficiency of [...]
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The point of this paper is the comparison between the different kind of shapes turbine blades in relation to efficiency of the stage. The first part of the paper deals wi [...]
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Presented paper deals with computational fatigue strength prediction of high pressure level steam turbine blade pin joints. Quazi-static FE analysis of one turbine disk s [...]
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This paper presents a simulation of 3D curved crack propagation in a steam turbine blade lock. These fatigue cracks are often initiated near a blade root contact zone. Tw [...]
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