44 estimation of the variation of the curvature of

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Unformatted text preview: e are represented in part b and c of figure 3. Such surface consists of large plateaus which will carry load during the practical lifetime of the part and valleys which will retain lubricant. The topography of the surfaces is modified during operation. In fact, the peaks of the roughness profile will typically be worn off or down during the run- in period, while most valleys remain unchanged. The surface comes thus closer to the ideal profile. However, most actual manufacturing processes (hard turning, grinding…) lead to surfaces of very high quality. For such feature, t he points around the mean profile are distributed according to a Gaussian probability density, containing only few peaks and valleys (curve a, of f igure 3). Moreover, the use of very hard enhanced materials does no longer permit any plastic deformation or abrasion of the roughness peaks. The initial surface profiles remain thus practically unchanged during first operation of the parts. This phenomeno n has been observed on most industrial parts we had to expertise ( like axels of suspension damper of automotives, bearings, gears, …). The MGA between the functional surfaces is no longer possible. Consequently, exc...
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This note was uploaded on 08/03/2010 for the course DD 1234 taught by Professor Zczxc during the Spring '10 term at Magnolia Bible.

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