Efimov V.P.,Russian Academy of Sciences |
Nikiforovsky V.S.,Siberian State Transport University
Journal of Mining Science | Year: 2010
The paper proposes an assessment method for safe stress in the kinetic concept of strength based on the warm-up drift technique in the model of a steady state with a broken bond. The authors added molecular interaction potential with a second potential energy minimum that corresponds to an excited molecule with broken bonds with its neighbors. The quasi-homogenous fracture model with using macro-values of a continuum has yielded that safe stress for metals and salts equals 10-20 % of their temporal tensile strength. © 2010 Pleiades Publishing, Ltd.
Bobrov A.L.,Siberian State Transport University
Russian Journal of Nondestructive Testing | Year: 2010
Peculiarities of the estimation of the state of sections with casting flaws in cast parts using acoustic-emission (AE) method are considered. The dynamics of variations in AE parameters for developing flaws during mechanical tests is analyzed. The methods for distinguishing useful information of AE signals from the regions of localization of casting flaws are revealed. © Allerton Press, Inc., 2010.
Popkov A.,Siberian State Transport University
Journal of Physics: Conference Series | Year: 2016
The article contains information about acoustic emission signals analysing using autocorrelation function. Operation factors were analysed, such as shape of signal, the origins time and carrier frequency. The purpose of work is estimating the validity of correlations methods analysing signals. Acoustic emission signal consist of different types of waves, which propagate on different trajectories in object of control. Acoustic emission signal is amplitude-, phase- and frequency-modeling signal. It was described by carrier frequency at a given point of time. Period of signal make up 12.5 microseconds and carrier frequency make up 80 kHz for analysing signal. Usage autocorrelation function like indicator the origin time of acoustic emission signal raises validity localization of emitters. © Published under licence by IOP Publishing Ltd.
Maslov N.A.,Siberian State Transport University
Russian Engineering Research | Year: 2014
The possibility of pump diagnostics on the basis of its duration of deceleration is considered. A test bench with an inertial drive is developed for positive-displacement pumps, along with corresponding methods of analysis. © 2014, Allerton Press, Inc.
Isakov A.,Siberian State Transport University |
Moryachkov Y.,Siberian State Transport University
International Journal of Geomechanics | Year: 2014
Modern methods for calculating slope stability in current finite-element programs involve the stepwise uniform reduction of the soil strength parameters. However, prediction of the strength-reduction law under the influence of external factors is not actually possible. The suggested method for safety-factor minimization will produce the most reliable estimation of slope stability. This idea is illustrated by calculating the safety factor for embankments composed of clay loam and sand. © 2014 American Society of Civil Engineers.