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Unformatted text preview: ress profile is finally determined using Von Mises criterion (figure 12). The extreme values of the equivalent stress are 218 MPa for a roller of 2.5 μm curvature and 277 MPa for 7.5 μm. This represents a variation of 23%. 234
CONCLUSION J. M. Linares et al. The constant improvement of the manufacturing processes allowed an increase in the geometrical quality of the mechanical systems leading to a reduction of the clearances between the parts. This paper brings to the fore the change of failure modes of such high quality mechanisms where malfunctions appear during the first running cycles or at low operation time. In fact the high quality of the surfaces and the increase of the hardness of the materials, modify the macro-comp ensation of the geometrical defects and does no longer permit any micro- accommodation. In this paper, an industrial example has been used to illustrate the impact of the geometric variations on the failure of the mechanical systems. Using a geometrical uncertainty model and a generalized Hertz contact calculation method, a great imp...
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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.
- Spring '10
- The Land