National Repository of Grey Literature 60 records found  beginprevious43 - 52next  jump to record: Search took 0.01 seconds. 
A proposal of methology for the estimation of durability of structures exposed to random loading
Svoboda, Jaroslav ; Balda, Miroslav
The paper describes results of fatigue tests, which have been carried out, on flat specimens with the notch in form of a hole in the middle. Specimens were loaded with three types of random blocks of 20 minutes duration. They mutually differed in a form of the power spectral density (PSD). All the PSDs were of linear form e.g. constant(white noise), linearly increasing and linearly decreasing in the frequency range 0-10Hz. Damage was measured and the method for estimation of live has been proposed.
Návrh metodiky výpočtu náhodně zatěžovaných konstrukcí
Svoboda, Jaroslav ; Balda, Miroslav
The report describes results of fatigue tests which have been carried out on flat speciments with the a hole in the middle. Speciments were loaded with three types of random blocks with 20 minutes duration. They mutually differed in a form of the power spectral density (PSD). All the PSDs were of linear form: constant,linearly increasing and linearly decreasing in the frequency range 0-10 Hz. The damage was observed and the metod for estimation of live for arbitrary form of PSD was proposed.
Shortening of multiaxial fatigue tests
Svoboda, Jaroslav
A method has been developed for fast shortening of multiaxial fatigue tests.
An Influence of out-of-phase combined loading
Svoboda, Jaroslav ; Václavík, Martin
The paper deals with a problem of finding a fatigue limit criterion for components subjected to combined out-of-phase loading.
The influence of power spectral density on the crack propagation by the random loading
Svoboda, Jaroslav ; Mazanec, Jiří
The study of fatigue properties of the steel E460 proved that the form of the power spectral density influences the durability of test specimens stressed with a wideband random loading.
Fatigue Properties of Steels Under Multiaxial Loading
Václavík, Martin ; Svoboda, Jaroslav
Study of combined loading influence to fatigue lifetime of smooth polished specimens made by the material 11523.1. Followed are the stress field changes at various rates of shear and normal loading, and the coherence between the level of particular stress components and specimen fatigue lifetime. Three hypotheses for limit stress computations (HMH, Findley´s and Dang Van's)were verified.
The influence of power spectral density on durability of the constructions under random loading
Svoboda, Jaroslav ; Václavík, Martin ; Balda, Miroslav
Paper follows the effect of power spectral density shape on fatigue life of three random wide-band processes with Gaussian amplitude distribution and frequency range 0-10 Hz. Compared are three modes: constant - white noise, linearly increasing and linearly decreasing.
Stressing optimization under shortened fatigue tests applications
Svoboda, Jaroslav
Paper sumarizes results of works focused on parameter optimization of the Rešet method of shortened fatigue tests that can be successfully applied to fatigue strength evaluation of dynamically stressed real structures. Works are aimed particularly at so called step loading speed, which significantly influences the test results.

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