Stress concentration degree

Hence, the stated above results have shown, that the stable crack in PASF samples, obtained from different solvents, can be treated as stochastic fi actal, whose dimension has clear physical significance - its value is reciprocal to stress concentration degree at a crack tip. The value is determined unequivocally by polymer structure fractal dimension and in its turn, influences on PASF samples fracture process parameters [8]. 

The values determined for the inherent flaws only represent effective sizes, corresponding to a given degree of stress concentration (Greensmith, 1964). This stress concentration also depends on the shape of a crack (e.g., bluntness), as well as the dissipative capacity of the material itself (Hamed et al., 1996). Although compounding variables such as crosslink density strongly affect the... 

Through the measurement of coal and rock physical and mechanical parameters, the no. 2 coal seam of Liyazhuang coal mine has medium impact tendency and no impact on the roof strata. Due to stress concentration, hazard of 2-228 island working face is rock burst risk, and the rock burst hazard degree is weak shock hazard. 

The value of hydrodynamic friction drag reduction by means of small additives of water-soluble high-molecular polymers is known to depend on many factors [1,2]. These factors are, first of all, the molecular mass of a polymer, the linearity of a molecular structure with a small number of lateral branchings which determine elasticity the concentration of a polymer the range of tangential stresses the degree of mechanical destruction etc. 

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