By S. Sharma
This ebook is ready fundamentals of electric Engineering
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Additional info for Basics of Electrical Engineering
From these steps, expressions are derived to determine whether a given set of design parameters is satisfactory, and the values that certain parameters must assume so that the wear will be acceptable. 7. Numerical example T Let us consider a hemispherically-ended pin of radius R = 5 mm, sliding against the flat surface ofa disc. The system under consideration is shown in Fig. 14. The radius, r, of the wear track is 75 mm. The material of the disc is ~ . 5 x lo2 N/mm2. 25 x lo2 N/mm2. 7rev min- ' which corresponds to V =O.
Thus it is known that corrosion 32 Tribology in machine design greatly accelerates fatigue, for example, by hydrogen embrittlement of iron, so that V f cwill tend to be large and positive. On the other hand, adhesion and fatigue rarely, if ever, coexist, and this is presumably because adhesive wear destroys the microcracks from which fatigue propagates. Hence, the wear volume V f adue to the interaction between fatigue and adhesion will always be zero. Since adhesion and corrosion are dimensionally similar, it may be hoped that V a cand V f a cwill prove to be negligible.
Referring to Fig. 18, suppose A B is a stationary plane boundary and C D a parallel boundary moving with linear velocity, V. A B and C D are separated by a continuous oil film of uniform thickness, h. The boundaries are assumed to be of infinite extent so that edge effects are neglected. The fluid velocity at a boundary is that of the adherent film so that velocity at A B is zero and at C D is V. Let us denote by u velocity of fluid in the plane EF at a perpendicular distance y from AB and by u + 6u the velocity in the plane GH at a distance y + 6y from AB.