Numerous computation tools have been developed to

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Unformatted text preview: oller The curvature is linked to the second radius r of the torus. Its value C is derived from equation 3: C = r − r2 − L ( 2 )2 The maximal and the minimal values of this curvature are determined considering the maximal and minimal values of r (rmax. ˜ 10414 mm and rmin. ˜ 3907 mm): Cmax. = 7.2 μm, Cmin. = 2.7μm Curvature μm 2.5 5 7.5 a mm 14.43 10.95 9.29 b mm 0.86 0.99 1.07 Contact area mm2 9.75 8.51 7.81 Figure 10; Contact area 4.5. Estimation of the equivalent stress The equivalent stress can be calculated by a Hertz analytical approach [Hills et al., 1993], the finite element method (FEM) or the boundary element method (BEM) [Guyot et al., 2000], [Moro et al., 2002], [Aliabadi et al., 2000], [Banerjee, 1994] using Von Mises criterion. Impact of Geometric Uncertainties 7 .5 μm 2.5 μ m 5 μm 233 383 Mpa 440 Mpa Maximum contact pressure 0 .86 m m 0 .99 m m 480 Mpa 1 .07 mm 1 4.43 mm 1 0.95 mm 9. 29 mm Contact area Figure 11; Effect of the geometrical uncertainty on the contact area and the contact pressure The generalized Hertz model has been used to determine the in- depth stress pr...
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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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