Strain-life fatigue parameters of unalloyed, low and high alloy steels, aluminium and titanium alloys and their strain-life behaviour across low-cycle, medium and high cycle fatigue range were analyzed. From results of the analysis it can be concluded that in estimation of strain-life fatigue parameters differential approach might be desirable, i.e. that separate expressions should be developed for every material group. It is expected that such an approach could result in more accurate estimations of fatigue parameters and hence, more accurate estimations of time to crack initiation.
COBISS.SI-ID: 11469339
The yield-point phenomenon is typical of annealed low-alloy steels and related alloys and occurs at first transition from the elastic into the elasto-plastic region. The effects of cyclic plasticity are described with constitutive equations of kinematic and cyclic hardening or softening. In order to define material parameters and establish the stress-strain response of the constitutive model in comparison with the actual state, uniaxial monotonous and uniaxial cyclic tension-compression experiments were carried out. The model is included in the finite element code.
COBISS.SI-ID: 11451419
The vehicle simulator models systems on the vehicle, including suspension, powertrain, braking and steering system. The models are incorporated into a software application with visualization in virtual 3D, which can simulate a wheeled vehicle of various configurations with up to eight wheels in real time. The simulation models also control actuators of a haptic interface to provide motion and force feedback. The system was verified by measurements on real vehicles. The results correspond well, making the system usable for studying different aspects of vehicle performance.
COBISS.SI-ID: 11310875
With a view to detecting incipient failures in large-size low-speed rolling bearings, a new multivariate and multiscale statistical monitoring method was developed. The developed method, which combines the Principal Component Analysis (PCA) and the Ensemble Empirical Mode Decomposition (EEMD) method, was called EEMD-MSPCA. The efficiency of the developed method was verified on a purpose-built laboratory test stand. The fact that the developed method is able to identify local bearing defect of a very small size indicates that the method ensures high-reliability bearing fault detection.
COBISS.SI-ID: 11450395
Blunt (non-penetrating) aortic injuries, in which the arterial wall is damaged in the direction from the intima towards the adventitia, are most commonly the result of a traffic accident. An overview of the literature and medical documentation reveals that different terms are used to describe certain forms of traumatic aortic injuries, which can lead to misinterpretation of findings or diagnoses. The new classification proposed allows simple and systematic screening of all types of blunt aortic injuries. It prevents misinterpretation of various types of aortic injury in medical practice.
COBISS.SI-ID: 26905049