Usually is established with the reference number of cycles corresponding to the material endurance limit. However, for the remaining (relatively small) on the basis of the number of cycles can be made of a similar curve (Fig. 76). If the loop between base 10'-10 '(having a sufficiently dense Level) corresponding to a series of such curves, it can be based on a given V. And the Qm bonds to estimate the fatigue strength of the various non-symmetric coefficients. However, to make a series of similar limit cycle curve, the need for a very large number of corrugated hose test. Resulting in such a problem, i.e. to determine whether the findings according to any one cycle fatigue strength when the pulsation cycle (say) work in the case of a variety of non-symmetrical coefficients of the fatigue strength of the corrugated hose. To this end, it is necessary to have a way to determine the parameters given the strength of the cycle (rk-0) pulsation cycle (r 20). If their corresponding points are located on the circular curve with a maximum for a given cycle (Figure 76 D point) and the pulsation cycle (B point) that is such strength. To find the unknown Connections between the loop parameter with a variety of non-symmetrical coefficient, we adopted Gail Bell (Fep6ep)-proposed method, the parabola through the feature points A and C as the approximate limit cycles FIG s4.se. Then you can think parabola axis and the vertical axis coincide. Applications Gail Bell simplify the derived limit cycle map, you can get the intensity pulsation cycle parameters of the asymmetric coefficient cycle into the following formula. - corrugated hose material strength limit, 00 - pulsation cycle maximum equivalent stress.
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The above formula is only applicable to those Cr + O. Does not exceed the the corrugated hose material yield limit. (Or rather, should be proportional limit ANU) cycle, because the stress calculation method is available only within the scope of application of Hooke's law.
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