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Gaussian, distribution of tolerance variations. 0% out of tolerance band Examples Apply Gladman’s design factors to the examples in preceding sections and comment on differences between results obtained. 1. 3 RELIABILITY OF FATIGUE CALCULATIONS Values of fatigue strength or endurance limit of materials given in technical publications generally represent results from tests on standard specimens. The endurance strength of a component made from such a material is then obtained from ( f, comp = f, .

M. for S = 90% of bearings. , in order to establish an equivalent “Basic Dynamic Capacity” = C , corresponding to 1 x lo6 revolutions and 90% reliability. 9) C = Basic dynamic load capacity for lo6 revolutions P = equivalent applied load n = index depending on type of bearing used. 8) and Fig. 9) is related to a statistical 90% reliability level. If a different reliability level is required, (a) at the same load, the number of revolutions (life)will have to be reduced or increased, as the case may be; 56 APPROXIMATE METHODS I N ENGINEERING DESIGN (b) at the same number of revolutions (life),the load will have to be reduced or increased, as the case may be.

Qx,) xf . f(Xi) xi. 18~)and the table can now be used to calculate the coefficients a,, a l , a2, etc. (vi) It is advisable, and informative, to establish the degree of accuracy, or “goodness of fit” of the correlation finally established. 19) where x, = arithmetic mean of xi. Note. If a “best straight line” is being sought, only coefficients a, and a, need to be established. For a quadratic curve a,, a, and a, are needed and so on for higher order curves. 82 1 3-46 (a) Find “best straight line”.

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