Št. zadetkov: 9
Pregledni znanstveni članek
Oznake:
elastoviscoplasticity;irreversible deformation;time dependence;separation;
Several current models for elastoviscoplasticity use irreversible deformations without dividing them into time-dependent and time-independent components. This article presents experimental data on the difference in the mode of deformation and in the fracture conditions compared to the actual values. ...
Leto:
2008
Vir:
dLib.si Digitalna knjižnica Slovenije
Izvirni znanstveni članek
Oznake:
metallic materials;cyclic loading;creep deformation;modelling;reliability;
The model of deformation for isotropic metallic materials aimed at obtaining an increased accuracy for forecasting their behavior during complex cyclical loading, in particular cyclic loading where a significant creep role is played in the processes of creep, was developed. As with the majority of m ...
Leto:
2007
Vir:
dLib.si Digitalna knjižnica Slovenije
Izvirni znanstveni članek
Oznake:
jeklo;lezenje;izohrone krivulje;krivulje lezenja;Nortonova enačba;Soderbergova enačba;Arheniusova odvisnost za hitrost lezenja;jekla R2M, EP291, 20Cr12WNiMoV;
Leto:
2011
Vir:
dLib.si Digitalna knjižnica Slovenije
Izvirni znanstveni članek
Oznake:
single crystals;cyclic and axial loading;thermal fatigue;failure criteria;
The accumulation of deformation affects the lifetime of a monocristal submitted to low cyclic mechanical and thermal loading. An analytical method was developed considering the damages due to cyclic and axial plastic and creep deformation. The method was checked with tests in vacuum on specimens of ...
Leto:
2008
Vir:
dLib.si Digitalna knjižnica Slovenije
Izvirni znanstveni članek
Oznake:
thermal fatigue;single crystal;crystallographic orientation;crack;concentrator;
This paper presents a thermal-mechanical fatigue (TMF) test procedure and some results obtained in vacuum for a Ni-based superalloy single crystal. This procedure allows the monitoring of slip lines, fatigue-crack initiation and propagation until final failure. Single-crystal specimens with differen ...
Leto:
2007
Vir:
dLib.si Digitalna knjižnica Slovenije
Pregledni znanstveni članek
Oznake:
safety factor;finite element computation;creep;loading;cycle;fatigue;
Principles for the selection of modern methods for the determination of local strength safety factors in design computations of GTE parts for static and cyclic loading are suggested. It is shown that the selection of methods for the evaluation of local strength safety factors should be carried out a ...
Leto:
2008
Vir:
dLib.si Digitalna knjižnica Slovenije
Izvirni znanstveni članek
Oznake:
fatigue;creep;thermal fatigue;crack;C*-integral;turbine blades;finite element simulation;
Methods and computational algorithms for determining the growth rate of fatigue creep and thermal-fatigue cracks are considered. The rate of crack growth is dependent on the stress-intensity factor (or J-integral) for fatigue, on the C*-integral for creep and on the stress-intensity factor (or J-int ...
Leto:
2012
Vir:
dLib.si Digitalna knjižnica Slovenije
Izvirni znanstveni članek
Oznake:
steels and Ni superalloys;long-term exposure to high temperatures;mechanical properties;microstructure;durability and life-time prediction;
The results of studies on the mechanical properties, long-term durability, thermal fatigue resistance and microstructure of metal blades made from various steels and Ni-based superalloys after long-term (up to 100,000 h) main-gas-line exposure conditions are presented. The data were developed and th ...
Leto:
2006
Vir:
dLib.si Digitalna knjižnica Slovenije
Izvirni znanstveni članek
Oznake:
Larson-Miller dependence;turbine blade;remaining lifetime;coating;diffusion;equivalent temperature;
In the course of the exploitation of gas-turbine units (GTE) their turbine blades accumulate defects. These defects result from both the static stress caused by the centrifugal forces and by the thermo-cyclic stress. Since gas turbines usually operate under variable conditions, the time of exploitat ...
Leto:
2011
Vir:
dLib.si Digitalna knjižnica Slovenije