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the crack
The forward problem is to solve the natural frequencies through a cracked structural model and the inverse problem is to quantitatively determine the crack parameters using the experimental testing frequencies.
      
By analyzing the bifurcation plot, Poincare section plots and amplitude spectra, we found that the crack greatly influences the dynamic characteristics of the rotor-bearing system.
      
The effect of hydrogen on the susceptibility is more obvious in the low stress region due to the longer fracture time, which resulted in a longer time for more hydrogen to diffuse toward the crack tip.
      
The results showed that an interaction between stress and hydrogen at the crack tip could increase the anodic dissolution rate remarkably.
      
Utilizing the obtained load against crack opening displacement curve, the value of GI-bridging at any crack extension as well as the change of GI-bridging with the crack extension is examined.
      
The dependence of linear tension on the curvature radius of the crack frontal line is calculated as applied to different mechanisms of the crack growth using dispersion forces as an example.
      
It is established that the role of linear tension in similar criteria increases with the narrowing of the crack and becomes significant in nanocracks.
      
It is shown that an increase of linear tension upon the introduction of sorbate into the crack does not interfere with the effect of adsorption-induced reduction of strength (the Rehbinder effect).
      
A general principle is formulated by the use of which, in conjunction with the solution of the problem of a crack, a solution can be obtained in the case where the crack is replaced by a difficultly permeable curtain.
      
The development of the crack opening process and the dimensions of the open-crack zone are determined by the dynamics of the pressure variation in the injected fluid.
      
The time-periodic motions of a liquid layer of finite depth beneath an ice sheet with a straight infinite crack having a periodic dependence on the horizontal coordinate in the direction of the crack are considered.
      
It is assumed that the thickness of the plate changes abruptly across the crack.
      
Analyzing the features of acoustic pulses, one can relate them to the dimensions and rate of the crack propagation, as well as control the sample destruction process.
      
The effect of certain factors, namely the initial length of the crack, the temperature of the specimen, and repeated loading, on crack propagation is qualitatively considered.
      
We have studied basic parameters of emission processes as functions of the crack edge velocity, its dimensions and depth in the material with due account of its elastic and strength characteristics and loading conditions.
      
Residual changes were detected in deeper cracks, which manifested as critical ows of metal near the crack edge and growth of cracks to their critical dimensions.
      
After extracting the powder from the crack pores by means of a permanent magnet and the subsequent radionuclide gamma-quantum irradiation, the X-ray-fluorescent K-radiation of iron of the ferromagnetic powder is measured.
      
An insignificant increase (by 0.25 μm) of the crack opening generates a considerable flow of AE signals.
      
An insignificant increase (by 0.25 μm) of the crack opening generates a considerable flow of AE signals.
      
Physical interpretation was made for the maxima of the detected amplitude and for specific stages in the length dependence of the total number of AE acts produced by the crack.
      
 

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