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By Alexander Balankin; José Francisco Martínez Trinidad; Orlando Susarrey Huerta
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Additional info for Fracture mechanics : selected peer reviewed papers from the Symposium 8 Fracture Mechanics from the XVIII International Materials Research, Cancún, Quintana Roo, August 16-20, 2009 Mexico
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Passoja, D. E. and Paullay, A. J. Nature, 308 (1984), p. 721-722. [6] Milman, V. , Stelmashenko, N. , and Blumenfeld, R. Prog. in Mat. Sci. 38 (1994), p. 425474. S.. Eng. Fract. Mech. 6 (1995), p. 997–1033. [8] Balankin, A. S. Eng. Fract. Mech. 57, No. 2/3 (1997), p. 135-203. [9] Balankin, A. S. Phil. Mag. Lett. 74, No. 6 (1996), p. 415-422. [10] Balankin, A. S. and Sandoval, F. J. Rev. Mex. Fís. 43, No. 4 (1997), p. 545-591. [11] Balankin, A. , O.. Rev. Mex. Fís. 45, No. 4 (1999), p. 388-392.
In Figure 2, point “O” is the center of the bearings and point “0*” is the center of the journal. Angle θ refers to the angle in the crcumferential coordinate system X´O´Y´. The angle between the axes of the moving system X´,O*,Y´ and the fixed system XOY is denoted by ϕ p res and is called attitude angle. The angular position of the injection port is given by the angle β in the fixed system X O Y, and by the angle θ β = π + β − ϕ pres in the mobile system X´JY´. Fig. 2 Coordinate system Solution for pressurized model The expression given in analytical form for the pressure field in hybrid journal bearing is obtained in [4,5] in the following form: 2 L ε OCV Sen θ POCV + PRES (θ , z ) = −6π z 2 −1 + ( ) ε θ D 1 + Cos ocv ( ) δ [θ − (π + β − ϕ )] L 3 1 − (1 + εCos θ ) az − (z − a ) q prt 2 D 2 ( (1) ) Key Engineering Materials Vol.
3) and (4) and KFC is the Fractal Fracture Toughness. From Eqs. (3) and (5), it can be see that the Kf = = KfC, and as a consequence, the crack starts to grow at constant stress. This behavior is attributed mainly to the microstructure of the material (as discussed before) and the type of paper. That is, for this paper, the local failures in the front of the crack tip, are due to the microstructure generated by the moisture in the material; the crack propagation is similar to a random walk in perpendicular direction to the load.